Adding a Connection to HDFS

To add a connection to HDFS:

1. In the application console, navigate to the Connections page.
2. At the Add Connections panel, select the icon for the connection you want to add.
3. If the HDFS icon is not available, click the Add More icon to download and install the HDFS connector from the CData site.

For required properties, see the Settings tab.

For connection properties that are not typically required, see the Advanced tab.

Connecting to HDFS

In order to connect, set the following connection properties:

• Host: Set this value to the host of your HDFS installation.
• Port: Set this value to the port of your HDFS installation. Default port: 9870
• UseSSL: (Optional) Set this value to 'True', to negotiate TLS/SSL connections to the HDFS server. Default: 'False'.

Authenticating to HDFS

There are two authentication methods available for connecting to the HDFS data source, Anonymous Authentication and Negotiate (Kerberos) Authentication.

Anonymous Authentication

In some situations, HDFS may be connected to without any authentication connection properties. To do so, set the AuthScheme to None (default).

Kerberos

When authentication credentials are required, you can use Kerberos. See Using Kerberos for details on how to authenticate with Kerberos.

Fine Tuning Data Access

You can use the following properties to gain more control over the data returned from HDFS:

• DirectoryRetrievalDepth: How many subfolders to be recursively scanned before stopping.
  -1 specifies that all subfolders are scanned. 0 specifies that only the current folder will be scanned for items.
• Path: Limit the subfolders recursively scanned.

Kerberos

To authenticate to HDFS with Kerberos, set AuthScheme to NEGOTIATE.

Authenticating to HDFS via Kerberos requires you to define authentication properties and to choose how Kerberos should retrieve authentication tickets.

Retrieve Kerberos Tickets

Kerberos tickets are used to authenticate the requester's identity. The use of tickets instead of formal logins/passwords eliminates the need to store passwords locally or send them over a network. Users are reauthenticated (tickets are refreshed) whenever they log in at their local computer or enter kinit USER at the command prompt.

The Sync App provides three ways to retrieve the required Kerberos ticket, depending on whether or not the KRB5CCNAME and/or KerberosKeytabFile variables exist in your environment.

MIT Kerberos Credential Cache File

This option enables you to use the MIT Kerberos Ticket Manager or kinit command to get tickets. With this option there is no need to set the User or Password connection properties.

This option requires that KRB5CCNAME has been created in your system.

To enable ticket retrieval via MIT Kerberos Credential Cache Files:

1. Ensure that the KRB5CCNAME variable is present in your environment.
2. Set KRB5CCNAME to a path that points to your credential cache file. (For example, C:\krb_cache\krb5cc_0 or /tmp/krb5cc_0.) The credential cache file is created when you use the MIT Kerberos Ticket Manager to generate your ticket.
3. To obtain a ticket:
   1. Open the MIT Kerberos Ticket Manager application.
   2. Click Get Ticket.
   3. Enter your principal name and password.
   4. Click OK.

   If the ticket is successfully obtained, the ticket information appears in Kerberos Ticket Manager and is stored in the credential cache file.

The Sync App uses the cache file to obtain the Kerberos ticket to connect to HDFS.

Note: If you would prefer not to edit KRB5CCNAME, you can use the KerberosTicketCache property to set the file path manually. After this is set, the Sync App uses the specified cache file to obtain the Kerberos ticket to connect to HDFS.

Keytab File

If your environment lacks the KRB5CCNAME environment variable, you can retrieve a Kerberos ticket using a Keytab File.

To use this method, set the User property to the desired username, and set the KerberosKeytabFile property to a file path pointing to the keytab file associated with the user.

User and Password

If your environment lacks the KRB5CCNAME environment variable and the KerberosKeytabFile property has not been set, you can retrieve a ticket using a user and password combination.

To use this method, set the User and Password properties to the user/password combination that you use to authenticate with HDFS.

Enabling Cross-Realm Authentication

More complex Kerberos environments can require cross-realm authentication where multiple realms and KDC servers are used. For example, they might use one realm/KDC for user authentication, and another realm/KDC for obtaining the service ticket.

To enable this kind of cross-realm authentication, set the KerberosRealm and KerberosKDC properties to the values required for user authentication. Also, set the KerberosServiceRealm and KerberosServiceKDC properties to the values required to obtain the service ticket.

This section details a selection of advanced features of the HDFS Sync App.

User Defined Views

The Sync App supports the use of user defined views, virtual tables whose contents are decided by a pre-configured user defined query. These views are useful when you cannot directly control queries being issued to the drivers. For an overview of creating and configuring custom views, see User Defined Views .

SSL Configuration

Use SSL Configuration to adjust how Sync App handles TLS/SSL certificate negotiations. You can choose from various certificate formats;. For further information, see the SSLServerCert property under "Connection String Options" .

Firewall and Proxy

Configure the Sync App for compliance with Firewall and Proxy, including Windows proxies and HTTP proxies. You can also set up tunnel connections.

Query Processing

The Sync App offloads as much of the SELECT statement processing as possible to HDFS and then processes the rest of the query in memory (client-side).

For further information, see Query Processing.

Logging

For an overview of configuration settings that can be used to refine CData logging, see Logging. Only two connection properties are required for basic logging, but there are numerous features that support more refined logging, which enables you to use the LogModules connection property to specify subsets of information to be logged.

Customizing the SSL Configuration

To enable TLS, set UseSSL to True.

With this configuration, the Sync App attempts to negotiate TLS with the server. The server certificate is validated against the default system trusted certificate store. You can override how the certificate gets validated using the SSLServerCert connection property.

To specify another certificate, see the SSLServerCert connection property.

Connecting Through a Firewall or Proxy

HTTP Proxies

To authenticate to an HTTP proxy, set the following:

• ProxyServer: the hostname or IP address of the proxy server that you want to route HTTP traffic through.
• ProxyPort: the TCP port that the proxy server is running on.
• ProxyAuthScheme: the authentication method the Sync App uses when authenticating to the proxy server.
• ProxyUser: the username of a user account registered with the proxy server.
• ProxyPassword: the password associated with the ProxyUser.

Other Proxies

Set the following properties:

• To use a proxy-based firewall, set FirewallType, FirewallServer, and FirewallPort.
• To tunnel the connection, set FirewallType to TUNNEL.
• To authenticate, specify FirewallUser and FirewallPassword.
• To authenticate to a SOCKS proxy, additionally set FirewallType to SOCKS5.

The CData Sync App models HDFS objects as relational tables and views. HDFS objects have relationships to other objects; in the tables, these relationships are expressed through foreign keys. The following sections show the available API objects and provide more information on executing SQL to HDFS APIs.

Schemas for most database objects are defined in simple, text-based configuration files.

Key Features

• The Sync App models HDFS entities such as files and permissions as relational views, allowing you to write SQL to query HDFS data.
• Stored procedures allow you to execute operations to HDFS
• Live connectivity to these objects means any changes to your HDFS account are immediately reflected when using the Sync App.

Views are similar to tables in the way that data is represented; however, views are read-only.

Queries can be executed against a view as if it were a normal table.

HDFS Connector for CData Sync Views

Name	Description
Files	Lists the contents of the supplied path.
Permissions	Lists the permissions of the files/file specified in the path.

Lists the contents of the supplied path.

Table Specific Information

Select

This will return a list of all the files and directories in your system. By default all subfolders are recursively scanned to list their children. You can configure the depth of subfolders you want to be recursively scanned with DirectoryRetrievalDepth property. All filters are executed client side within the Sync App.

Columns

Name	Type	Description
FileId [KEY]	Long	The unique Id associated with the file.
PathSuffix	String	The path suffix.
FullPath	String	The full path of the file.
Owner	String	The user who is the owner.
Group	String	The group owner.
Length	Long	The number of bytes in a file.
Permission	String	The permission represented as a octal string
Replication	Integer	The number of replication of a file.
StoragePolicy	Integer	The name of the storage policy
ChildrenNum	Integer	The number of children the file has.
BlockSize	Long	The block size of a file.
ModificationTime	Datetime	The modification time.
AccessTime	Datetime	The access time.
Type	String	The type of the path object.

Lists the permissions of the files/file specified in the path.

Table Specific Information

Select

This will return a list of permissions of all the files and directories in your system. All filters are executed client side within the Sync App.

Columns

Name	Type	Description
FullPath [KEY]	String	The full path of the file.
OwnerRead	Boolean	Whether the owner this file belongs to has read access.
OwnerWrite	Boolean	Whether the owner this file belongs to has write access.
OwnerExecute	Boolean	Whether the owner this file belongs to has execute access.
GroupRead	Boolean	Whether the group this file belongs to has read access.
GroupWrite	Boolean	Whether the group this file belongs to has write access.
GroupExecute	Boolean	Whether the group this file belongs to has execute access.
OthersRead	Boolean	Whether everyone else has read access.
OthersWrite	Boolean	Whether everyone else has write access.
OthersExecute	Boolean	Whether everyone else has execute access.

Stored procedures are function-like interfaces that extend the functionality of the Sync App beyond simple SELECT operations with HDFS.

Stored procedures accept a list of parameters, perform their intended function, and then return any relevant response data from HDFS, along with an indication of whether the procedure succeeded or failed.

HDFS Connector for CData Sync Stored Procedures

Name	Description
AppendToFile	Create and Write to a File.
Concat	Concatenate a group of files to another file.
CreateSnapshot	Create a Snapshot of a folder.
CreateSymLink	Create a Symbolic Link.
DeleteFile	Delete a file or a directory.
DeleteSnapshot	Delete a Snapshot of a folder.
GetContentSummary	Get the content summary of a file/folder.
GetFileChecksum	Get the checksum of a file.
GetHomeDirectory	Get the home directory for the current user.
GetTrashRoot	Get the root directory of Trash for current user when the path specified is deleted.
ListStatus	Lists the contents of the supplied path.
MakeDirectory	Create a directory in the specified path.
RenameFile	Rename a file or a directory.
RenameSnapshot	Rename a Snapshot of a folder.
SetOwner	Set owner and group of a path.
SetPermission	Set permission of a path.
TruncateFile	Truncate a file to a new length.

Create and Write to a File.

Input

Name	Type	Required	Description
Path	String	True	The absolute path of the file for which content will be appended.
FilePath	String	False	The path of the file whose content will be appended to the specified file. Has higher priority than Content.
Content	String	False	The content as a string which will be appended to the specified file. Has lower priority than FilePath.

Result Set Columns

Name	Type	Description
Success	Boolean	Whether the operation completed successfully or not.

Concatenate a group of files to another file.

Input

Name	Type	Required	Description
Path	String	True	The path which will be concatenated with other paths/sources.
Sources	String	True	A comma separated list of paths/sources. These will be joined to the Path input.

Result Set Columns

Name	Type	Description
Success	Boolean	Whether the operation completed successfully or not.

Create a Snapshot of a folder.

Input

Name	Type	Required	Description
Path	String	False	The path for which the snapshot will be created. Must be a folder.
SnapshotName	String	False	The name of the snapshot which will be created.

Result Set Columns

Name	Type	Description
Path	String	The path of the created snapshot.

Create a Symbolic Link.

Input

Name	Type	Required	Description
Path	String	True	The path for which a symbolic link will be created.
Destination	String	True	The destination of the symbolic link.
CreateParent	Boolean	False	Whether the parent of the symbolic link should be created.

Result Set Columns

Name	Type	Description
Success	Boolean	Whether the operation completed successfully or not.

Delete a file or a directory.

Input

Name	Type	Required	Description
Path	String	True	The path of the file or folder to be deleted.
Recursive	Boolean	False	If deleting a folder, set this to true to delete all its contents as well.

Result Set Columns

Name	Type	Description
Success	Boolean	Indicates whether the operation was successful.

Delete a Snapshot of a folder.

Input

Name	Type	Required	Description
Path	String	True	The folder path from which the snapshot will be deleted.
SnapshotName	String	True	The name of the snapshot to delete.

Result Set Columns

Name	Type	Description
Success	Boolean	Indicates if the snapshot deletion operation was successful.

Open and read a file.

Input

Name	Type	Required	Description
Path	String	True	The path of the file which will be opened.
Offset	Integer	False	The offset from which the reading will start.
Length	Integer	False	The amount of how much will be read from the file.
BufferSize	Integer	False	The internal size of the buffer which will be used for the reading of the file
WriteToFile	String	False	The local location of the file where the output will be written to.
Encoding	String	False	The FileData input encoding type. The allowed values are NONE, BASE64. The default value is NONE.

Result Set Columns

Name	Type	Description
Success	Boolean	Whether the operation completed successfully or not.
Output	String	The file's content. Output will be displayed only if WriteToFile and FileStream are not set.

Get the content summary of a file/folder.

Input

Name	Type	Required	Description
Path	String	True	The absolute path of the file/folder whose content summary will be returned.

Result Set Columns

Name	Type	Description
DirectoryCount	String	The number of directories in this folder.
FileCount	String	The number of files in this folder.
Length	Integer	The length of the folder/file.
Quota	Integer	The quota of the folder/file.
SpaceConsumed	Integer	The amount of space consumed by this folder/file.
SpaceQuota	Integer	The space quota of the folder/file.
ECPolicy	String	The Erasure Coding Policy of the folder/file.
SnapshotFileCount	Integer	The number of files in this folder snapshot.
SnapshotSpaceConsumed	Integer	The amount of space consumed by this folder/file snapshot.
SnapshotDirectoryCount	Integer	The number of directories in this folder snapshot.
SnapshotLength	Integer	The length of the folder/file snapshot.

Get the checksum of a file.

Input

Name	Type	Required	Description
Path	String	True	The path for which the checksum will be returned. Must be a file.

Result Set Columns

Name	Type	Description
Algorithm	String	The algorithm used for the checksum.
Bytes	String	The checksum returned.
Length	Integer	The length of the file.

Get the home directory for the current user.

Result Set Columns

Name	Type	Description
Path	String	The path of the current user's home directory.

Get the root directory of Trash for current user when the path specified is deleted.

Input

Name	Type	Required	Description
Path	String	False	The path whose trash root will be returned.

Result Set Columns

Name	Type	Description
Path	String	The path of the current user's trash root (for the specified path).

Lists the contents of the supplied path.

Input

Name	Type	Required	Description
Path	String	False

Result Set Columns

Name	Type	Description
FileId	Long	The unique Id associated with the file.
PathSuffix	String	The path suffix.
Owner	String	The user who is the owner.
Group	String	The group owner.
Length	Long	The number of bytes in a file.
Permission	String	The permission represented as a octal string
Replication	Integer	The number of replication of a file.
StoragePolicy	Integer	The name of the storage policy
ChildrenNum	Integer	The number of children the file has.
BlockSize	Long	The block size of a file.
ModificationTime	Datetime	The modification time.
AccessTime	Datetime	The access time.
Type	String	The type of the path object.

Create a directory in the specified path.

Input

Name	Type	Required	Description
Path	String	False	The path of the new directory which will be created.
Permission	String	False	The permission of the new directory. If no permissions are specified, the newly created directory will have 755 permission as default.

Result Set Columns

Name	Type	Description
Success	Boolean	Whether the operation completed successfully or not.

Rename a file or a directory.

Input

Name	Type	Required	Description
Path	String	True	The path which will be renamed.
Destination	String	True	The new path for the renamed file/folder.

Result Set Columns

Name	Type	Description
Success	Boolean	Whether the operation completed successfully or not.

Rename a Snapshot of a folder.

Input

Name	Type	Required	Description
Path	String	False	The path for which the snapshot will be renamed. Must be a folder.
SnapshotName	String	True	The new name of the snapshot.
OldSnapshotName	String	True	The old name of the snapshot.

Result Set Columns

Name	Type	Description
Success	Boolean	Whether the operation completed successfully or not.

Set owner and group of a path.

Input

Name	Type	Required	Description
Path	String	False	The path whose owner/group will be changed.
Owner	String	False	The new owner.
Group	String	False	The new group.

Result Set Columns

Name	Type	Description
Success	Boolean	Whether the operation completed successfully or not.

Set permission of a path.

Input

Name	Type	Required	Description
Path	String	False	The path whose permissions will be changed
Permission	String	True	Unix permissions in an octal (base-8) notation.

Result Set Columns

Name	Type	Description
Success	Boolean	Whether the operation completed successfully or not.

Truncate a file to a new length.

Input

Name	Type	Required	Description
Path	String	True	The path of the file which will be truncated.
NewLength	Integer	True	The new length for this file.

Result Set Columns

Name	Type	Description
Success	Boolean	Whether the operation completed successfully or not.

Create and Write to a File.

Input

Name	Type	Required	Description
Path	String	False	The absolute path of the file which will be created.
Overwrite	Boolean	False	If set to true, the file will be overwritten.
BlockSize	Integer	False	The block size for this file.
Permission	String	False	The permissions which will be set for the created file.
FilePath	String	False	The path of the file whose content will be written to the newly created file. Has higher priority than Content.
Content	String	False	The content as a string which will be written to the newly created file. Has lower priority than FilePath.

Result Set Columns

Name	Type	Description
Success	Boolean	Whether the operation completed successfully or not.

The connection string properties are the various options that can be used to establish a connection. This section provides a complete list of the options you can configure in the connection string for this provider. Click the links for further details.

For more information on establishing a connection, see Establishing a Connection.

Authentication

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Property	Description
AuthScheme	The scheme used for authentication. Accepted entries are None, and Negotiate (Kerberos). None is the default.
Host	This property specifies the host of your HDFS installation.
Port	This property specifies the port of your HDFS installation.
User	The user name to login to the HDFS server.
Password	The password used to authenticate to the HDFS server. Only used when Kerberos authentication is selected.
AccessToken	The HDFS Access Token.
UseSSL	This field sets whether SSL is enabled.

Connection

---

Property	Description
Path	This property specifies the HDFS path which will be used as the working directory.
DirectoryRetrievalDepth	Limit the subfolders recursively scanned.

Kerberos

---

Property	Description
KerberosKDC	Identifies the Kerberos Key Distribution Center (KDC) service used to authenticate the user. (SPNEGO or Windows authentication only).
KerberosRealm	Identifies the Kerberos Realm used to authenticate the user.
KerberosSPN	Identifies the service principal name (SPN) for the Kerberos Domain Controller.
KerberosUser	Confirms the principal name for the Kerberos Domain Controller, which uses the format host/user@realm.
KerberosKeytabFile	Identifies the Keytab file containing your pairs of Kerberos principals and encrypted keys.
KerberosServiceRealm	Identifies the service's Kerberos realm. (Cross-realm authentication only).
KerberosServiceKDC	Identifies the service's Kerberos Key Distribution Center (KDC).
KerberosTicketCache	Specifies the full file path to an MIT Kerberos credential cache file.

SSL

---

Property	Description
SSLServerCert	Specifies the certificate to be accepted from the server when connecting using TLS/SSL.

Firewall

---

Property	Description
FirewallType	Specifies the protocol the provider uses to tunnel traffic through a proxy-based firewall.
FirewallServer	Identifies the IP address, DNS name, or host name of a proxy used to traverse a firewall and relay user queries to network resources.
FirewallPort	Specifies the TCP port to be used for a proxy-based firewall.
FirewallUser	Identifies the user ID of the account authenticating to a proxy-based firewall.
FirewallPassword	Specifies the password of the user account authenticating to a proxy-based firewall.

Proxy

---

Property	Description
ProxyAutoDetect	Specifies whether the provider checks your system proxy settings for existing proxy server configurations, rather than using a manually specified proxy server.
ProxyServer	Identifies the hostname or IP address of the proxy server through which you want to route HTTP traffic.
ProxyPort	Identifies the TCP port on your specified proxy server that has been reserved for routing HTTP traffic to and from the client.
ProxyAuthScheme	Specifies the authentication method the provider uses when authenticating to the proxy server specified in the ProxyServer connection property.
ProxyUser	Provides the username of a user account registered with the proxy server specified in the ProxyServer connection property.
ProxyPassword	Specifies the password of the user specified in the ProxyUser connection property.
ProxySSLType	Specifies the SSL type to use when connecting to the proxy server specified in the ProxyServer connection property.
ProxyExceptions	Specifies a semicolon-separated list of destination hostnames or IPs that are exempt from connecting through the proxy server set in the ProxyServer connection property.

Logging

---

Property	Description
LogModules	Specifies the core modules to include in the log file. Use a semicolon-separated list of module names. By default, all modules are logged.

Schema

---

Property	Description
Location	Specifies the location of a directory containing schema files that define tables, views, and stored procedures. Depending on your service's requirements, this may be expressed as either an absolute path or a relative path.
BrowsableSchemas	Optional setting that restricts the schemas reported to a subset of all available schemas. For example, BrowsableSchemas=SchemaA,SchemaB,SchemaC .
Tables	Optional setting that restricts the tables reported to a subset of all available tables. For example, Tables=TableA,TableB,TableC .
Views	Optional setting that restricts the views reported to a subset of the available tables. For example, Views=ViewA,ViewB,ViewC .

Miscellaneous

---

Property	Description
MaxRows	Specifies the maximum number of rows returned for queries that do not include either aggregation or GROUP BY.
Other	Specifies advanced connection properties for specialized scenarios. Use this property only under the guidance of our Support team to address specific issues.
PseudoColumns	Specifies the pseudocolumns to expose as table columns, expressed as a string in the format 'TableName=ColumnName;TableName=ColumnName'.
Timeout	Specifies the maximum time, in seconds, that the provider waits for a server response before throwing a timeout error.
UserDefinedViews	Specifies a filepath to a JSON configuration file that defines custom views. The provider automatically detects and uses the views specified in this file.

This section provides a complete list of the Authentication properties you can configure in the connection string for this provider.

---

Property	Description
AuthScheme	The scheme used for authentication. Accepted entries are None, and Negotiate (Kerberos). None is the default.
Host	This property specifies the host of your HDFS installation.
Port	This property specifies the port of your HDFS installation.
User	The user name to login to the HDFS server.
Password	The password used to authenticate to the HDFS server. Only used when Kerberos authentication is selected.
AccessToken	The HDFS Access Token.
UseSSL	This field sets whether SSL is enabled.

The scheme used for authentication. Accepted entries are None, and Negotiate (Kerberos). None is the default.

Remarks

This field is used to authenticate against the server. Use the following options to select your authentication scheme:

• None: Set this to use anonymous authentication and connect to the HDFS data source without specifying the user credentials.
• Negotiate: If AuthScheme is set to Negotiate, the Sync App will negotiate an authentication mechanism with the server. Set AuthScheme to Negotiate if you want to use Kerberos authentication.
• Token: Set this to authenticate using an AccessToken.

This property specifies the host of your HDFS installation.

Remarks

This property specifies the host of your HDFS installation.

This property specifies the port of your HDFS installation.

Remarks

This property specifies the port of your HDFS installation.

The user name to login to the HDFS server.

Remarks

The user name to login to the HDFS server. If AuthScheme=None, it is used as the authenticated user. If AuthScheme=Negotiate, it is used in the Kerberos Authentication as a client principal.

The password used to authenticate to the HDFS server. Only used when Kerberos authentication is selected.

Remarks

The password used to authenticate to the HDFS server. Only used when Kerberos authentication is selected.

The HDFS Access Token.

Remarks

The HDFS Access Token used to authenticate the requests.

This field sets whether SSL is enabled.

Remarks

This field sets whether the Sync App will attempt to negotiate TLS/SSL connections to the server. By default, the Sync App checks the server's certificate against the system's trusted certificate store. To specify another certificate, set SSLServerCert.

This section provides a complete list of the Connection properties you can configure in the connection string for this provider.

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Property	Description
Path	This property specifies the HDFS path which will be used as the working directory.
DirectoryRetrievalDepth	Limit the subfolders recursively scanned.

This property specifies the HDFS path which will be used as the working directory.

Remarks

This property specifies the HDFS path which will be used as the working directory. Used in views Files and Permissions.

Limit the subfolders recursively scanned.

Remarks

DirectoryRetrievalDepth specifies how many subfolders will be recursively scanned before stopping. -1 specifies that all subfolders are scanned. 0 specifies that only the current folder will be scanned for items.

This section provides a complete list of the Kerberos properties you can configure in the connection string for this provider.

---

Property	Description
KerberosKDC	Identifies the Kerberos Key Distribution Center (KDC) service used to authenticate the user. (SPNEGO or Windows authentication only).
KerberosRealm	Identifies the Kerberos Realm used to authenticate the user.
KerberosSPN	Identifies the service principal name (SPN) for the Kerberos Domain Controller.
KerberosUser	Confirms the principal name for the Kerberos Domain Controller, which uses the format host/user@realm.
KerberosKeytabFile	Identifies the Keytab file containing your pairs of Kerberos principals and encrypted keys.
KerberosServiceRealm	Identifies the service's Kerberos realm. (Cross-realm authentication only).
KerberosServiceKDC	Identifies the service's Kerberos Key Distribution Center (KDC).
KerberosTicketCache	Specifies the full file path to an MIT Kerberos credential cache file.

Identifies the Kerberos Key Distribution Center (KDC) service used to authenticate the user. (SPNEGO or Windows authentication only).

Remarks

The Kerberos properties are used when using SPNEGO or Windows Authentication. The Sync App requests session tickets and temporary session keys from the Kerberos KDC service, which is usually co-located with the domain controller.

If KerberosKDC is not specified, the Sync App tries to detect these properties automatically from the following locations:

• KRB5 Config File (krb5.ini/krb5.conf): If the KRB5_CONFIG environment variable is set and the file exists, the Sync App obtains the KDC from the specified file. If it is not found there, the Sync App tries to read from the default MIT location based on the OS: C:\ProgramData\MIT\Kerberos5\krb5.ini (Windows) or /etc/krb5.conf (Linux).
• Domain Name and Host: If the Kerberos Realm and Kerberos KDC cannot be inferred from another location, the Sync App infers them from the configured domain name and host.

Identifies the Kerberos Realm used to authenticate the user.

Remarks

A realm is a logical network, similar to a domain, that defines a group of systems under the same master KDC. Some realms are hierarchical, where one realm is a superset of the other realm, but usually realms are nonhierarchical (or “direct”) and the mapping between the two realms must be defined. Kerberos cross-realm authentication enables authentication across realms. Each realm only needs to have a principal entry for the other realm in its KDC.

The Kerberos properties are used when using SPNEGO or Windows Authentication. The Sync App requests session tickets and temporary session keys from the Kerberos KDC service, which is usually co-located with the domain controller. The Kerberos Realm can be configured by an administrator to be any string, but it is usually based on the domain name.

If Kerberos Realm is not specified, the Sync App will attempt to detect these properties automatically from the following locations:

• KRB5 Config File (krb5.ini/krb5.conf): If the KRB5_CONFIG environment variable is set and the file exists, the Sync App will obtain the default realm from the specified file. Otherwise, it will attempt to read from the default MIT location based on the OS: C:\ProgramData\MIT\Kerberos5\krb5.ini (Windows) or /etc/krb5.conf (Linux)
• Domain Name and Host: If the Kerberos Realm and Kerberos KDC could not be inferred from another location, the Sync App will infer them from the user-configured domain name and host. This might work in some Windows environments.

Identifies the service principal name (SPN) for the Kerberos Domain Controller.

Remarks

If the SPN on the Kerberos Domain Controller is not the same as the URL that you are authenticating to, use this property to set the SPN to the KDC's URL.

Confirms the principal name for the Kerberos Domain Controller, which uses the format host/user@realm.

Remarks

If there is a Kerberos principal, that Kerberos principal name should always be used to authenticate to the database.

Identifies the Keytab file containing your pairs of Kerberos principals and encrypted keys.

Remarks

A keytab (short for “key table”) stores long-term keys for one or more principals. In most cases, end users authenticate to the KDC using their client secret (password). However, in situations where authentication or re-authentication happen using automated scripts and applications, it may be more efficient to use a keytab, which sends passwords to the KDC in encrypted form, automatically.

Keytabs are normally represented by files in a standard format, and named using the format type:value. Usually type is FILE and value is the absolute pathname of the file. The other possible value for type is MEMORY, which indicates a temporary keytab stored in the memory of the current process.

A keytab contains one or more entries, where each entry consists of a timestamp (indicating when the entry was written to the keytab), a principal name, a key version number, an encryption type, and the encryption key itself. They can be generated using kutil.

For example:

[admin@myhost]# ktutil

ktutil: addent -password -p starlord/[email protected] -k 1 -e aes256-cts-hmac-sha1-96
Password for starlord/myhost.galaxy.com:

ktutil: addent -password -p starlord/[email protected] -k 1 -e aes128-cts-hmac-sha1-96
Password for starlord/myhost.galaxy.com:

ktutil: addent -password -p starlord/[email protected] -k 1 -e des3-cbc-sha1
Password for starlord/myhost.galaxy.com:

ktutil: wkt /path/to/starlord.keytab

Note: You must create principals for all authentication methods (encryption types) you want to support.

To display a keytab, use klist -k.

Identifies the service's Kerberos realm. (Cross-realm authentication only).

Remarks

The KerberosServiceRealm is used to specify a service's KerberosRealm when using cross-realm Kerberos authentication.

In most cases, a single realm and KDC machine are used to perform the Kerberos authentication, which means that this property would not be required. However, the property is available for complex setups where a different realm and KDC machine are used to obtain an authentication ticket (AS request) and a service ticket (TGS request).

Identifies the service's Kerberos Key Distribution Center (KDC).

Remarks

The KerberosServiceKDC is used to specify the service Kerberos KDC when using cross-realm Kerberos authentication.

In most cases, a single realm and KDC machine are used to perform the Kerberos authentication, which means that this property would not be required. However, the property is available for complex setups where a different realm and KDC machine are used to obtain an authentication ticket (AS request) and a service ticket (TGS request).

Specifies the full file path to an MIT Kerberos credential cache file.

Remarks

Set this property if you want to use a credential cache file that was created using the MIT Kerberos Ticket Manager or kinit command.

This section provides a complete list of the SSL properties you can configure in the connection string for this provider.

---

Property	Description
SSLServerCert	Specifies the certificate to be accepted from the server when connecting using TLS/SSL.

Specifies the certificate to be accepted from the server when connecting using TLS/SSL.

Remarks

If you are using a TLS/SSL connection, use this property to specify the TLS/SSL certificate to be accepted from the server. If you specify a value for this property, all other certificates that are not trusted by the machine are rejected.

This property can take the following forms:

Description	Example
A full PEM Certificate (example shortened for brevity)	-----BEGIN CERTIFICATE----- MIIChTCCAe4CAQAwDQYJKoZIhv......Qw== -----END CERTIFICATE-----
A path to a local file containing the certificate	C:\cert.cer
The public key (example shortened for brevity)	-----BEGIN RSA PUBLIC KEY----- MIGfMA0GCSq......AQAB -----END RSA PUBLIC KEY-----
The MD5 Thumbprint (hex values can also be either space- or colon-separated)	ecadbdda5a1529c58a1e9e09828d70e4
The SHA1 Thumbprint (hex values can also be either space- or colon-separated)	34a929226ae0819f2ec14b4a3d904f801cbb150d

Note: It is possible to use '*' to signify that all certificates should be accepted, but due to security concerns this is not recommended.

This section provides a complete list of the Firewall properties you can configure in the connection string for this provider.

---

Property	Description
FirewallType	Specifies the protocol the provider uses to tunnel traffic through a proxy-based firewall.
FirewallServer	Identifies the IP address, DNS name, or host name of a proxy used to traverse a firewall and relay user queries to network resources.
FirewallPort	Specifies the TCP port to be used for a proxy-based firewall.
FirewallUser	Identifies the user ID of the account authenticating to a proxy-based firewall.
FirewallPassword	Specifies the password of the user account authenticating to a proxy-based firewall.

Specifies the protocol the provider uses to tunnel traffic through a proxy-based firewall.

Remarks

A proxy-based firewall (or proxy firewall) is a network security device that acts as an intermediary between user requests and the resources they access. The proxy accepts the request of an authenticated user, tunnels through the firewall, and transmits the request to the appropriate server.

Because the proxy evaluates and transfers data backets on behalf of the requesting users, the users never connect directly with the servers, only with the proxy.

Note: By default, the Sync App connects to the system proxy. To disable this behavior and connect to one of the following proxy types, set ProxyAutoDetect to false.

The following table provides port number information for each of the supported protocols.

Protocol	Default Port	Description
TUNNEL	80	The port where the Sync App opens a connection to HDFS. Traffic flows back and forth via the proxy at this location.
SOCKS4	1080	The port where the Sync App opens a connection to HDFS. SOCKS 4 then passes theFirewallUser value to the proxy, which determines whether the connection request should be granted.
SOCKS5	1080	The port where the Sync App sends data to HDFS. If the SOCKS 5 proxy requires authentication, set FirewallUser and FirewallPassword to credentials the proxy recognizes.

To connect to HTTP proxies, use ProxyServer and ProxyPort. To authenticate to HTTP proxies, use ProxyAuthScheme, ProxyUser, and ProxyPassword.

Identifies the IP address, DNS name, or host name of a proxy used to traverse a firewall and relay user queries to network resources.

Remarks

A proxy-based firewall (or proxy firewall) is a network security device that acts as an intermediary between user requests and the resources they access. The proxy accepts the request of an authenticated user, tunnels through the firewall, and transmits the request to the appropriate server.

Because the proxy evaluates and transfers data backets on behalf of the requesting users, the users never connect directly with the servers, only with the proxy.

Specifies the TCP port to be used for a proxy-based firewall.

Remarks

A proxy-based firewall (or proxy firewall) is a network security device that acts as an intermediary between user requests and the resources they access. The proxy accepts the request of an authenticated user, tunnels through the firewall, and transmits the request to the appropriate server.

Because the proxy evaluates and transfers data backets on behalf of the requesting users, the users never connect directly with the servers, only with the proxy.

Identifies the user ID of the account authenticating to a proxy-based firewall.

Remarks

A proxy-based firewall (or proxy firewall) is a network security device that acts as an intermediary between user requests and the resources they access. The proxy accepts the request of an authenticated user, tunnels through the firewall, and transmits the request to the appropriate server.

Because the proxy evaluates and transfers data backets on behalf of the requesting users, the users never connect directly with the servers, only with the proxy.

Specifies the password of the user account authenticating to a proxy-based firewall.

Remarks

A proxy-based firewall (or proxy firewall) is a network security device that acts as an intermediary between user requests and the resources they access. The proxy accepts the request of an authenticated user, tunnels through the firewall, and transmits the request to the appropriate server.

Because the proxy evaluates and transfers data backets on behalf of the requesting users, the users never connect directly with the servers, only with the proxy.

This section provides a complete list of the Proxy properties you can configure in the connection string for this provider.

---

Property	Description
ProxyAutoDetect	Specifies whether the provider checks your system proxy settings for existing proxy server configurations, rather than using a manually specified proxy server.
ProxyServer	Identifies the hostname or IP address of the proxy server through which you want to route HTTP traffic.
ProxyPort	Identifies the TCP port on your specified proxy server that has been reserved for routing HTTP traffic to and from the client.
ProxyAuthScheme	Specifies the authentication method the provider uses when authenticating to the proxy server specified in the ProxyServer connection property.
ProxyUser	Provides the username of a user account registered with the proxy server specified in the ProxyServer connection property.
ProxyPassword	Specifies the password of the user specified in the ProxyUser connection property.
ProxySSLType	Specifies the SSL type to use when connecting to the proxy server specified in the ProxyServer connection property.
ProxyExceptions	Specifies a semicolon-separated list of destination hostnames or IPs that are exempt from connecting through the proxy server set in the ProxyServer connection property.

Specifies whether the provider checks your system proxy settings for existing proxy server configurations, rather than using a manually specified proxy server.

Remarks

When this connection property is set to True, the Sync App checks your system proxy settings for existing proxy server configurations (no need to manually supply proxy server details).

This connection property takes precedence over other proxy settings. If you want to configure the Sync App to connect to a specific proxy server, set ProxyAutoDetect to False.

To connect to an HTTP proxy, see ProxyServer. For other proxies, such as SOCKS or tunneling, see FirewallType.

Identifies the hostname or IP address of the proxy server through which you want to route HTTP traffic.

Remarks

The Sync App only routes HTTP traffic through the proxy server specified in this connection property when ProxyAutoDetect is set to False.

If ProxyAutoDetect is set to True (the default), the Sync App instead routes HTTP traffic through the proxy server specified in your system proxy settings.

Identifies the TCP port on your specified proxy server that has been reserved for routing HTTP traffic to and from the client.

Remarks

The Sync App only routes HTTP traffic through the ProxyServer port specified in this connection property when ProxyAutoDetect is set to False.

If ProxyAutoDetect is set to True (the default), the Sync App instead routes HTTP traffic through the proxy server port specified in your system proxy settings.

For other proxy types, see FirewallType.

Specifies the authentication method the provider uses when authenticating to the proxy server specified in the ProxyServer connection property.

Remarks

Supported authentication types :

• BASIC: The Sync App performs HTTP basic authentication.
• DIGEST: The Sync App performs HTTP digest authentication.
• NTLM: The Sync App retrieves an NTLM token.
• NEGOTIATE: The Sync App retrieves an NTLM or Kerberos token based on the applicable protocol for authentication.
• NONE: Signifies that the ProxyServer does not require authentication.

For all values other than NONE, you must also set the ProxyUser and ProxyPassword connection properties.

If you need to use another authentication type, such as SOCKS 5 authentication, see FirewallType.

Provides the username of a user account registered with the proxy server specified in the ProxyServer connection property.

Remarks

The ProxyUser and ProxyPassword connection properties are used to connect and authenticate against the HTTP proxy specified in ProxyServer.

After selecting one of the available authentication types in ProxyAuthScheme, set this property as follows:

ProxyAuthScheme Value	Value to set for ProxyUser
BASIC	The username of a user registered with the proxy server.
DIGEST	The username of a user registered with the proxy server.
NEGOTIATE	The username of a Windows user who is a valid user in the domain or trusted domain that the proxy server is part of, in the format user@domain or domain\user.
NTLM	The username of a Windows user who is a valid user in the domain or trusted domain that the proxy server is part of, in the format user@domain or domain\user.
NONE	Do not set the ProxyPassword connection property.

Note: The Sync App only uses this username if ProxyAutoDetect is set to False. If ProxyAutoDetect is set to True (the default), the Sync App instead uses the username specified in your system proxy settings.

Specifies the password of the user specified in the ProxyUser connection property.

Remarks

The ProxyUser and ProxyPassword connection properties are used to connect and authenticate against the HTTP proxy specified in ProxyServer.

After selecting one of the available authentication types in ProxyAuthScheme, set this property as follows:

ProxyAuthScheme Value	Value to set for ProxyPassword
BASIC	The password associated with the proxy server user specified in ProxyUser.
DIGEST	The password associated with the proxy server user specified in ProxyUser.
NEGOTIATE	The password associated with the Windows user account specified in ProxyUser.
NTLM	The password associated with the Windows user account specified in ProxyUser.
NONE	Do not set the ProxyPassword connection property.

For SOCKS 5 authentication or tunneling, see FirewallType.

Note: The Sync App only uses this password if ProxyAutoDetect is set to False. If ProxyAutoDetect is set to True (the default), the Sync App instead uses the password specified in your system proxy settings.

Specifies the SSL type to use when connecting to the proxy server specified in the ProxyServer connection property.

Remarks

This property determines when to use SSL for the connection to the HTTP proxy specified by ProxyServer. You can set this connection property to the following values :

AUTO	Default setting. If ProxyServer is set to an HTTPS URL, the Sync App uses the TUNNEL option. If ProxyServer is set to an HTTP URL, the component uses the NEVER option.
ALWAYS	The connection is always SSL enabled.
NEVER	The connection is not SSL enabled.
TUNNEL	The connection is made through a tunneling proxy. The proxy server opens a connection to the remote host and traffic flows back and forth through the proxy.

Specifies a semicolon-separated list of destination hostnames or IPs that are exempt from connecting through the proxy server set in the ProxyServer connection property.

Remarks

The ProxyServer is used for all addresses, except for addresses defined in this property. Use semicolons to separate entries.

Note: The Sync App uses the system proxy settings by default, without further configuration needed. If you want to explicitly configure proxy exceptions for this connection, set ProxyAutoDetect to False.

This section provides a complete list of the Logging properties you can configure in the connection string for this provider.

---

Property	Description
LogModules	Specifies the core modules to include in the log file. Use a semicolon-separated list of module names. By default, all modules are logged.

Specifies the core modules to include in the log file. Use a semicolon-separated list of module names. By default, all modules are logged.

Remarks

The Sync App writes details about each operation it performs into the logfile specified by the Logfile connection property.

Each of these logged operations are assigned to a themed category called a module, and each module has a corresponding short code used to labels individual Sync App operations as belonging to that module.

When this connection property is set to a semicolon-separated list of module codes, only operations belonging to the specified modules are written to the logfile. Note that this only affects which operations are logged moving forward and doesn't retroactively alter the existing contents of the logfile. For example: INFO;EXEC;SSL;META;

By default, logged operations from all modules are included.

You can explicitly exclude a module by prefixing it with a "-". For example: -HTTP

To apply filters to submodules, identify them with the syntax <module name>.<submodule name>. For example, the following value causes the Sync App to only log actions belonging to the HTTP module, and further refines it to exclude actions belonging to the Res submodule of the HTTP module: HTTP;-HTTP.Res

Note that the logfile filtering triggered by the Verbosity connection property takes precedence over the filtering imposed by this connection property. This means that operations of a higher verbosity level than the level specified in the Verbosity connection property are not printed in the logfile, even if they belong to one of the modules specified in this connection property.

The available modules and submodules are:

Module Name	Module Description	Submodules
INFO	General Information. Includes the connection string, product version (build number), and initial connection messages.	Connec – Information related to creating or destroying connections. Messag – Generic label for messages pertaining to connections, the connection string, and product version. These messages are typically specific to the Sync App, rather than being received and passed along directly from the service.
EXEC	Query Execution. Includes execution messages for user-written SQL queries, parsed SQL queries, and normalized SQL queries. Success/failure messages for queries and query pages appear here as well.	Messag – Messages pertaining to query execution. These messages are typically specific to the Sync App, rather than being received and passed along directly from the service. Normlz – Query normalization steps. Query normalization is when the product takes the user-submitted query and rewrites the query to get the same results with optimal performance. Origin – This label applies to any messages recording a user's original query (the exact, unaltered, non-normalized query executed by the user). Page – Messages related to query paging. Parsed – Query parsing steps. Parsing is the process of converting the user-submitted query into a standardized format for easier processing.
HTTP	HTTP protocol messages. Includes HTTP requests/responses (including POST messages), as well as Kerberos related messages.	KERB – HTTP requests related to Kerberos. Messag – Messages pertaining to HTTP protocols. These messages are typically specific to the Sync App, rather than being received and passed along directly from the service. Unpack – This label applies to messages about zipped data being returned from the service API and unpacked by the product. Res – Messages containing HTTP responses. Req – Messages containing HTTP requests.
WSDL	Messages pertaining to the generation of WSDL/XSD files.	—
SSL	SSL certificate messages.	Certif – Messages pertaining to SSL certificates.
AUTH	Authentication related failure/success messages.	Messag – Messages pertaining to authentication. These messages are typically specific to the Sync App, rather than being received and passed along directly from the service. OAuth – Messages related to OAuth authentication. Krbros – Kerberos-related authentication messages.
SQL	Includes SQL transactions, SQL bulk transfer messages, and SQL result set messages.	Bulk – Messages pertaining to bulk query execution. Cache – Messages related to reading row data from and writing row data to the product's cache for better performance. Messag – Messages pertaining to SQL transactions. These messages are typically specific to the Sync App, rather than being received and passed along directly from the service. ResSet – Query resultsets. Transc – Messages related to handling transactions, including information about the number of jobs executed and backup table handling.
META	Metadata cache and schema messages.	Cache – Messages related to reading from and modifying column and table definitions in the product's cache for better performance. Schema – Messages related to retrieving metadata from or modifying the service schema. MemSto – Messages related to writing to or reading from in-memory metadata cache. Storag – Messages relating to storing metadata on disk or in an external data store, rather than in memory.
FUNC	Information related to executing SQL functions.	Errmsg – Error messages related to executing SQL functions.
TCP	Incoming and outgoing raw bytes on TCP transport layer messages.	Send – Raw data sent via the TCP protocol. Receiv – Raw data received via the TCP protocol.
FTP	Messages pertaining to the File Transfer Protocol.	Info – Status messages related to communication in the FTP protocol. Client – Messages related to actions taken by the FTP client (the product) during FTP communication. Server – Messages related to actions taken by the FTP server during FTP communication.
SFTP	Messages pertaining to the Secure File Transfer Protocol.	Info – Status messages related to communication in the SFTP protocol. To_Server – Messages related to actions taken by the SFTP client (the product) during SFTP communication. From_Server – Messages related to actions taken by the SFTP server during SFTP communication.
POP	Messages pertaining to data transferred via the Post Office Protocol.	Client – Messages related to actions taken by the POP client (the product) during POP communication. Server – Messages related to actions taken by the POP server during POP communication. Status – Status messages related to communication in the POP protocol.
SMTP	Messages pertaining to data transferred via the Simple Mail Transfer Protocol.	Client – Messages related to actions taken by the SMTP client (the product) during SMTP communication. Server – Messages related to actions taken by the SMTP server during SMTP communication. Status – Status messages related to communication in the SMTP protocol.
CORE	Messages relating to various internal product operations not covered by other modules.	—
DEMN	Messages related to SQL remoting.	—
CLJB	Messages about bulk data uploads (cloud job).	Commit – Submissions for bulk data uploads.
SRCE	Miscellaneous messages produced by the product that don't belong in any other module.	—
TRANCE	Advanced messages concerning low-level product operations.	—

This section provides a complete list of the Schema properties you can configure in the connection string for this provider.

---

Property	Description
Location	Specifies the location of a directory containing schema files that define tables, views, and stored procedures. Depending on your service's requirements, this may be expressed as either an absolute path or a relative path.
BrowsableSchemas	Optional setting that restricts the schemas reported to a subset of all available schemas. For example, BrowsableSchemas=SchemaA,SchemaB,SchemaC .
Tables	Optional setting that restricts the tables reported to a subset of all available tables. For example, Tables=TableA,TableB,TableC .
Views	Optional setting that restricts the views reported to a subset of the available tables. For example, Views=ViewA,ViewB,ViewC .

Specifies the location of a directory containing schema files that define tables, views, and stored procedures. Depending on your service's requirements, this may be expressed as either an absolute path or a relative path.

Remarks

The Location property is only needed if you want to either customize definitions (for example, change a column name, ignore a column, etc.) or extend the data model with new tables, views, or stored procedures.

If left unspecified, the default location is %APPDATA%\\CData\\HDFS Data Provider\\Schema, where %APPDATA% is set to the user's configuration directory:

Platform	%APPDATA%
Windows	The value of the APPDATA environment variable
Linux	~/.config

Optional setting that restricts the schemas reported to a subset of all available schemas. For example, BrowsableSchemas=SchemaA,SchemaB,SchemaC .

Remarks

Listing all available database schemas can take extra time, thus degrading performance. Providing a list of schemas in the connection string saves time and improves performance.

Optional setting that restricts the tables reported to a subset of all available tables. For example, Tables=TableA,TableB,TableC .

Remarks

Listing all available tables from some databases can take extra time, thus degrading performance. Providing a list of tables in the connection string saves time and improves performance.

If there are lots of tables available and you already know which ones you want to work with, you can use this property to restrict your viewing to only those tables. To do this, specify the tables you want in a comma-separated list. Each table should be a valid SQL identifier with any special characters escaped using square brackets, double-quotes or backticks. For example, Tables=TableA,[TableB/WithSlash],WithCatalog.WithSchema.`TableC With Space`.

Note: If you are connecting to a data source with multiple schemas or catalogs, you must specify each table you want to view by its fully qualified name. This avoids ambiguity between tables that may exist in multiple catalogs or schemas.

Optional setting that restricts the views reported to a subset of the available tables. For example, Views=ViewA,ViewB,ViewC .

Remarks

Listing all available views from some databases can take extra time, thus degrading performance. Providing a list of views in the connection string saves time and improves performance.

If there are lots of views available and you already know which ones you want to work with, you can use this property to restrict your viewing to only those views. To do this, specify the views you want in a comma-separated list. Each view should be a valid SQL identifier with any special characters escaped using square brackets, double-quotes or backticks. For example, Views=ViewA,[ViewB/WithSlash],WithCatalog.WithSchema.`ViewC With Space`.

Note: If you are connecting to a data source with multiple schemas or catalogs, you must specify each view you want to examine by its fully qualified name. This avoids ambiguity between views that may exist in multiple catalogs or schemas.

This section provides a complete list of the Miscellaneous properties you can configure in the connection string for this provider.

---

Property	Description
MaxRows	Specifies the maximum number of rows returned for queries that do not include either aggregation or GROUP BY.
Other	Specifies advanced connection properties for specialized scenarios. Use this property only under the guidance of our Support team to address specific issues.
PseudoColumns	Specifies the pseudocolumns to expose as table columns, expressed as a string in the format 'TableName=ColumnName;TableName=ColumnName'.
Timeout	Specifies the maximum time, in seconds, that the provider waits for a server response before throwing a timeout error.
UserDefinedViews	Specifies a filepath to a JSON configuration file that defines custom views. The provider automatically detects and uses the views specified in this file.

Specifies the maximum number of rows returned for queries that do not include either aggregation or GROUP BY.

Remarks

The default value for this property, -1, means that no row limit is enforced unless the query explicitly includes a LIMIT clause. (When a query includes a LIMIT clause, the value specified in the query takes precedence over the MaxRows setting.)

Setting MaxRows to a whole number greater than 0 ensures that queries do not return excessively large result sets by default.

This property is useful for optimizing performance and preventing excessive resource consumption when executing queries that could otherwise return very large datasets.

Specifies advanced connection properties for specialized scenarios. Use this property only under the guidance of our Support team to address specific issues.

Remarks

This property allows advanced users to configure hidden properties for specialized situations, with the advice of our Support team. These settings are not required for normal use cases but can address unique requirements or provide additional functionality. To define multiple properties, use a semicolon-separated list.

Note: It is strongly recommended to set these properties only when advised by the Support team to address specific scenarios or issues.

Integration and Formatting

Property	Description
DefaultColumnSize	Sets the default length of string fields when the data source does not provide column length in the metadata. The default value is 2000.
ConvertDateTimeToGMT=True	Converts date-time values to GMT, instead of the local time of the machine. The default value is False (use local time).
RecordToFile=filename	Records the underlying socket data transfer to the specified file.

Specifies the pseudocolumns to expose as table columns, expressed as a string in the format 'TableName=ColumnName;TableName=ColumnName'.

Remarks

This property allows you to define which pseudocolumns the Sync App exposes as table columns.

To specify individual pseudocolumns, use the following format:

Table1=Column1;Table1=Column2;Table2=Column3

To include all pseudocolumns for all tables use:

*=*

Specifies the maximum time, in seconds, that the provider waits for a server response before throwing a timeout error.

Remarks

The timeout applies to each individual communication with the server rather than the entire query or operation. For example, a query could continue running beyond 60 seconds if each paging call completes within the timeout limit.

Timeout is set to 60 seconds by default. To disable timeouts, set this property to 0.

Disabling the timeout allows operations to run indefinitely until they succeed or fail due to other conditions such as server-side timeouts, network interruptions, or resource limits on the server.

Note: Use this property cautiously to avoid long-running operations that could degrade performance or result in unresponsive behavior.

Specifies a filepath to a JSON configuration file that defines custom views. The provider automatically detects and uses the views specified in this file.

Remarks

UserDefinedViews allows you to define and manage custom views through a JSON-formatted configuration file called UserDefinedViews.json. These views are automatically recognized by the Sync App and enable you to execute custom SQL queries as if they were standard database views. The JSON file defines each view as a root element with a child element called "query", which contains the SQL query for the view.

For example:

{
	"MyView": {
		"query": "SELECT * FROM Files WHERE MyColumn = 'value'"
	},
	"MyView2": {
		"query": "SELECT * FROM MyTable WHERE Id IN (1,2,3)"
	}
}

You can use this property to define multiple views in a single file and specify the filepath. For example:

UserDefinedViews=C:\Path\To\UserDefinedViews.json

When you specify a view in UserDefinedViews, the Sync App only sees that view.

For further information, see User Defined Views.

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a) Subject to the terms of this Agreement, each Contributor hereby grants Recipient a non-exclusive, worldwide, royalty-free copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, distribute and sublicense the Contribution of such Contributor, if any, and such derivative works, in source code and object code form.

b) Subject to the terms of this Agreement, each Contributor hereby grants Recipient a non-exclusive, worldwide, royalty-free patent license under Licensed Patents to make, use, sell, offer to sell, import and otherwise transfer the Contribution of such Contributor, if any, in source code and object code form. This patent license shall apply to the combination of the Contribution and the Program if, at the time the Contribution is added by the Contributor, such addition of the Contribution causes such combination to be covered by the Licensed Patents. The patent license shall not apply to any other combinations which include the Contribution. No hardware per se is licensed hereunder.

c) Recipient understands that although each Contributor grants the licenses to its Contributions set forth herein, no assurances are provided by any Contributor that the Program does not infringe the patent or other intellectual property rights of any other entity. Each Contributor disclaims any liability to Recipient for claims brought by any other entity based on infringement of intellectual property rights or otherwise. As a condition to exercising the rights and licenses granted hereunder, each Recipient hereby assumes sole responsibility to secure any other intellectual property rights needed, if any. For example, if a third party patent license is required to allow Recipient to distribute the Program, it is Recipient's responsibility to acquire that license before distributing the Program.

d) Each Contributor represents that to its knowledge it has sufficient copyright rights in its Contribution, if any, to grant the copyright license set forth in this Agreement.

3. REQUIREMENTS

A Contributor may choose to distribute the Program in object code form under its own license agreement, provided that:

a) it complies with the terms and conditions of this Agreement; and

b) its license agreement:

i) effectively disclaims on behalf of all Contributors all warranties and conditions, express and implied, including warranties or conditions of title and non-infringement, and implied warranties or conditions of merchantability and fitness for a particular purpose;

ii) effectively excludes on behalf of all Contributors all liability for damages, including direct, indirect, special, incidental and consequential damages, such as lost profits;

iii) states that any provisions which differ from this Agreement are offered by that Contributor alone and not by any other party; and

iv) states that source code for the Program is available from such Contributor, and informs licensees how to obtain it in a reasonable manner on or through a medium customarily used for software exchange.

When the Program is made available in source code form:

a) it must be made available under this Agreement; and

b) a copy of this Agreement must be included with each copy of the Program.

Contributors may not remove or alter any copyright notices contained within the Program.

Each Contributor must identify itself as the originator of its Contribution, if any, in a manner that reasonably allows subsequent Recipients to identify the originator of the Contribution.

4. COMMERCIAL DISTRIBUTION

Commercial distributors of software may accept certain responsibilities with respect to end users, business partners and the like. While this license is intended to facilitate the commercial use of the Program, the Contributor who includes the Program in a commercial product offering should do so in a manner which does not create potential liability for other Contributors. Therefore, if a Contributor includes the Program in a commercial product offering, such Contributor ("Commercial Contributor") hereby agrees to defend and indemnify every other Contributor ("Indemnified Contributor") against any losses, damages and costs (collectively "Losses") arising from claims, lawsuits and other legal actions brought by a third party against the Indemnified Contributor to the extent caused by the acts or omissions of such Commercial Contributor in connection with its distribution of the Program in a commercial product offering. The obligations in this section do not apply to any claims or Losses relating to any actual or alleged intellectual property infringement. In order to qualify, an Indemnified Contributor must: a) promptly notify the Commercial Contributor in writing of such claim, and b) allow the Commercial Contributor to control, and cooperate with the Commercial Contributor in, the defense and any related settlement negotiations. The Indemnified Contributor may participate in any such claim at its own expense.

For example, a Contributor might include the Program in a commercial product offering, Product X. That Contributor is then a Commercial Contributor. If that Commercial Contributor then makes performance claims, or offers warranties related to Product X, those performance claims and warranties are such Commercial Contributor's responsibility alone. Under this section, the Commercial Contributor would have to defend claims against the other Contributors related to those performance claims and warranties, and if a court requires any other Contributor to pay any damages as a result, the Commercial Contributor must pay those damages.

5. NO WARRANTY

EXCEPT AS EXPRESSLY SET FORTH IN THIS AGREEMENT, THE PROGRAM IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED INCLUDING, WITHOUT LIMITATION, ANY WARRANTIES OR CONDITIONS OF TITLE, NON-INFRINGEMENT, MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Each Recipient is solely responsible for determining the appropriateness of using and distributing the Program and assumes all risks associated with its exercise of rights under this Agreement, including but not limited to the risks and costs of program errors, compliance with applicable laws, damage to or loss of data, programs or equipment, and unavailability or interruption of operations.

6. DISCLAIMER OF LIABILITY

EXCEPT AS EXPRESSLY SET FORTH IN THIS AGREEMENT, NEITHER RECIPIENT NOR ANY CONTRIBUTORS SHALL HAVE ANY LIABILITY FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING WITHOUT LIMITATION LOST PROFITS), HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OR DISTRIBUTION OF THE PROGRAM OR THE EXERCISE OF ANY RIGHTS GRANTED HEREUNDER, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

7. GENERAL

If any provision of this Agreement is invalid or unenforceable under applicable law, it shall not affect the validity or enforceability of the remainder of the terms of this Agreement, and without further action by the parties hereto, such provision shall be reformed to the minimum extent necessary to make such provision valid and enforceable.

If Recipient institutes patent litigation against a Contributor with respect to a patent applicable to software (including a cross-claim or counterclaim in a lawsuit), then any patent licenses granted by that Contributor to such Recipient under this Agreement shall terminate as of the date such litigation is filed. In addition, if Recipient institutes patent litigation against any entity (including a cross-claim or counterclaim in a lawsuit) alleging that the Program itself (excluding combinations of the Program with other software or hardware) infringes such Recipient's patent(s), then such Recipient's rights granted under Section 2(b) shall terminate as of the date such litigation is filed.

All Recipient's rights under this Agreement shall terminate if it fails to comply with any of the material terms or conditions of this Agreement and does not cure such failure in a reasonable period of time after becoming aware of such noncompliance. If all Recipient's rights under this Agreement terminate, Recipient agrees to cease use and distribution of the Program as soon as reasonably practicable. However, Recipient's obligations under this Agreement and any licenses granted by Recipient relating to the Program shall continue and survive.

Everyone is permitted to copy and distribute copies of this Agreement, but in order to avoid inconsistency the Agreement is copyrighted and may only be modified in the following manner. The Agreement Steward reserves the right to publish new versions (including revisions) of this Agreement from time to time. No one other than the Agreement Steward has the right to modify this Agreement. IBM is the initial Agreement Steward. IBM may assign the responsibility to serve as the Agreement Steward to a suitable separate entity. Each new version of the Agreement will be given a distinguishing version number. The Program (including Contributions) may always be distributed subject to the version of the Agreement under which it was received. In addition, after a new version of the Agreement is published, Contributor may elect to distribute the Program (including its Contributions) under the new version. Except as expressly stated in Sections 2(a) and 2(b) above, Recipient receives no rights or licenses to the intellectual property of any Contributor under this Agreement, whether expressly, by implication, estoppel or otherwise. All rights in the Program not expressly granted under this Agreement are reserved.

This Agreement is governed by the laws of the State of New York and the intellectual property laws of the United States of America. No party to this Agreement will bring a legal action under this Agreement more than one year after the cause of action arose. Each party waives its rights to a jury trial in any resulting litigation.