- Specifies the behavior of the target connector component
- Configures how data is transformed
- Configures the underlying link data transportation layer
- Affects how the initiator connector performs
Links are named configurations that include an initiating connector and a target connector. If the same property is set for a link and a connector, the link setting overrides the connector setting.
Basic Tab
Hive Connector | ||||
---|---|---|---|---|
Name | Default | Description | Overridable? Property Name |
Connector Type |
Server | None | Used to connect to the target database as part of the JDBC connection string. This is the IP address or DNS name of the target host. | Target | |
Port | 10000 | Valid values for Hiveserver 2 are 1026–65535. | Target | |
Database Name | Default | Name of the database for the connector, if not provided in the user query. Maximum name length is 255 characters. |
Target | |
Conf File Paths | /etc/hadoop/conf/, /etc/hive/conf/ |
Paths to core-site.xml and hive-site.xml in a comma-separated list. If both Hiveserver2 hive-site.xml and LLAP hive-site.xml exist, LLAP hive-site.xml has a higher a priority and is used when both files exist but contain different values. This is a required setting. |
Target |
Security Tab
Hive Connector | ||||
---|---|---|---|---|
Name | Default | Description | Overridable? Property Name |
Connector Type |
Authentication Mechanism | None | Authentication mechanism used on the target data source. Valid values are None, Kerberos, Trusted Kerberos, Kerberos SSO, and HS2Only. This is a required setting. For HDInsight clusters when using the Enterprise Security Package (ESP), select Kerberos. |
Target | |
Username | Hive | Name of the user. Maximum length is 255 characters. A username added for a connector or target connector link must be included in Allowed OS users. This NVP is saved in the QueryGrid Manager configuration and is required when the initiator does not support a mechanism to provide user credentials. The username is also used for connectivity diagnostic checks. |
Target | |
Password | None | User password. Maximum length is 255 characters. Used only if Kerberos, Trusted Kerberos, or HS2Only security is used. |
Target | |
Keytab | None | Absolute path to the Kerberos keytab file. QueryGrid only uses the keytab file for authentication if the user does not provide a username and password. | Target | |
Hive Kerberos Principal | None | The principal for HiveServer2 in the format of x/y@z. Overrides the principal that is read from the hive-site.xml for HiveServer2. Required when using Kerberos on CDH or CDP. |
Target | |
Role Support | False | Enable user role support for the
target system. When set to true, the user role from the initiator or target is applied to the target system based on role mapping, if any. If the cluster is configured to support roles, errors are returned back to the user. If the cluster is not configured to support roles, the user role is not applied. When set to false, roles are not applied to the target system. |
● roleSupport |
Target |
Knox Gateway Host | None | Knox gateway host. The use of this property indicates that Knox is being used. | Target | |
Knox Gateway Port | 8443 | Knox gateway port number. Valid values are 1024–65535. Required when only using Knox. |
Target | |
Knox Context Path | gateway/default/hive | Knox context path for HS2, for
example, gateway/mycluster/hive Required when only using Knox. |
Target | |
Knox Trust Store Path | None | Knox gateway trust store path. Required when only using Knox. |
Target | |
Knox Trust Store Password | None | Knox gateway trust store
password. Required when only using Knox. |
Target | |
Knox Connection Username | None | Username for the Knox
connection. Required when only using Knox. |
Target | |
Knox Connection Password | None | Password for the Knox
connection. Required when only using Knox. |
Target | |
SSL TrustStore Path | None | Specifies the truststore file
path when connecting to a hiveserver2 with SSL enabled.
|
Target | |
SSL TrustStore Password | None | Specifies the SSL truststore password when SSL is enabled for hiveserver2. | Target |
Query Engine Tab
Hive Connector | ||||
---|---|---|---|---|
Name | Default | Description | Overridable? Property Name |
Connector Type |
Hive Execution Engine | mr | Hive execution engine to use. Possible values are mr, tez, or spark. Not all values are supported on all Hive implementations. |
● hiveEngine |
Initiator, Target |
Number of Mappers | 3 * number of data nodes | The number of mappers (equivalent to containers) on the cluster. It defines the maximum parallelism per cluster per query. This is applicable when exporting data to Hive using a Teradata-to-Hive export, or importing data to Hive using a Hive-to-Teradata import. The following are intended to be conservative starting values:
|
● numMappers |
Initiator, Target |
Queue Name | None | Name of the queue that submits the MR, Tez, or Spark job. | ● queueName |
Initiator, Target |
HiveServer2 HA Enabled | False | Indicates whether to use Zookeeper HA options as part of the JDBC connect string. Set to true if connecting to a Zookeeper server for load balancing. | ● isHS2HAEnabled |
Target |
Hadoop Library Path | Default Hadoop library path | Required if Hadoop uses a custom
installation path instead of the default Hadoop path or if any
Hadoop .jar files are saved
outside of the default Hadoop library. Enter paths in a
comma-separated list. See Configuring the Hive Connector for Use with a Custom Hadoop Library Path or Custom JAR Path. If no custom information is available, the default Hadoop library path is used. |
Target | |
Custom JAR Path | None | Specifies the path or paths to use for .jar files not listed in Hadoop JAR Files. Enter paths in a comma-separated list. See Configuring the Hive Connector for Use with a Custom Hadoop Library Path or Custom JAR Path. | Target | |
Hadoop Properties | None | Specifies Hadoop environment
properties for a user session. Properties are provided in a list.
Use = between each property and its value (name=value, name=value, name=value), and a comma as a
separator between properties, with or without a space after the
comma. For example: mapred.job.queue.name=abcdef,mapreduce.task.timeout=3600000,mapreduce.map.speculative=falseIf Hadoop Properties is not selected, the default Hadoop environment properties are used. |
● hadoopProperties |
Target |
Compression Codec | System Default | Compression type to use when exporting to a Hive table. Valid values are System Default, Deflate, BZip2, Gzip, LZ4, and Snappy. | ● compressionCodec |
Target |
Number of Cores per Executor | None | For Hive-on-Spark only. Controls the number of concurrent tasks an Executor can run. If a value is not specified, the system default is used. | ● numExecutorCores |
Initiator, Target |
Advanced Tab
Hive Connector | ||||
---|---|---|---|---|
Name | Default | Description | Overridable? Property Name |
Connector Type |
Temporary Database Name | Default | Temporary database name for storing temporary tables and views. | ● tempDbName |
Target |
Enable Logging | INFO | Logging level for the connector or link properties. User level log settings can be explicitly set through the add or edit link page in the QueryGrid portlet. This setting applies to both the initiating and target connector; however, the logging level for the initiating connector in the link takes precedence if the connectors are set differently. Valid values are NONE, WARN, INFO, and DEBUG. |
Initiator, Target | |
Enable Query Logging | True | When set to true, QueryGrid logs query text in your local drive. When set to false, query text is not logged. Selecting false prevents sensitive customer data from potentially being saved outside the database for compliant environments, such as Teradata VantageCloud Lake. |
Target | |
16.20+ LOB Support | True | On Teradata systems version 16.20 and later, the STRING and BINARY columns on Hive are mapped to CLOB and BLOB by default. Deselect this option to map the STRING and BINARY columns to VARCHAR and VARBYTE, respectively. Disable this option if there are a large number of STRING/BINARY columns in the Hive table. |
● lobSupport |
Target |
Default String Size | 32000 characters | The VARCHAR truncation size. This is the size at which data imported from or exported to string columns is truncated. The value represents the maximum number of Unicode characters to import, and defaults to 32000 characters. QueryGrid truncates the string columns at the default value set in defaultStringSize if less than the actual column size. Valid values are 1–1048544000 characters. This is for a Teradata-to-Hive link and is used by the target Hive connector and is applicable when the initiating Teradata system does not support CLOB data types with QueryGrid. With CLOB support, the default string size is not used. |
● defaultStringSize |
Target |
Default Binary Size | 64000 bytes | The default truncation size for the VARBINARY types. Valid values are 1–2097088000 bytes. This is for a Teradata-to-Hive link and is used by the target Hive connector and is applicable when the initiating Teradata system does not support BLOB data types with QueryGrid. With BLOB support, the default binary size is not used. |
● defaultBinarySize |
Target |
Disable Pushdown | False | When set to true, disables the
pushdown of all query conditions to the target system. Certain system-level, session-level, and column-level query attributes, such as CASESPECIFIC, can affect character string comparison results. These attributes can cause some queries to return incorrect results due to incorrect row filtering on the target system. To avoid incorrect results caused by condition pushdown in situations where the settings on the initiating system do not match the settings on the target system, you can disable the pushdown of all conditions to the target system. If designated as Overridable, this property can only be overridden at the session level from false to true (indicating you are disabling pushdown), but cannot be changed from true to false. |
● disablePushdown |
Initiator |
Collect Approximate Activity Count | False | Displays the approximate number
of rows exported to the target data source. When set to false, the activity count displays a 1. When set to true, an approximate activity count is returned. The default is false. |
● collectActivityCount |
Target |
Support Hive Task Retries | False | When set to true, the fabric is enabled to support Hive Task Retries. When enabled, the fabric does not fail on the query when Hive tasks are retried. Instead, the fabric discards the data received from a failed task attempt and continues to process task data from the retried attempt. This feature is only supported when Hive is the data source, where Hive is importing data as a target or exporting data as an initiator, and the execution engine is mr or tez.
|
Initiator, Target | |
Spool File Path | /var/opt/teradata/tdqg/fabric/data/ | Local path to use for spool files if the fabric is enabled to support Hive Task Retries. When a custom path is specified, the specified directory must be present on all Hadoop data nodes configured in a QueryGrid cluster. The directory must have read, write, and execute permissions to create, read, and write files and sub directories for the querygrid OS group and the tdqg OS user.
|
Initiator, Target | |
Link Buffer Count | 4 | Maximum number of write buffers
available on a single channel at one time. Link Buffer Count overrides the
default internal fabric property
shmDefaultNumMemoryBuffers.
Valid values are 4–8. |
● linkBufferCount |
Initiator, Target |
Link Buffer Size | 1048576 | Maximum size of the write buffers
to allocate for row handling and message exchange. Valid values are 73728–10485760 bytes. |
● linkBufferSize |
Initiator |
Response Timeout | 86400000 | The number of milliseconds to wait for the target query to complete before timing out and stopping the operation. The fabric stops and releases all resources associated with queries whose duration exceeds the value set on the target link properties or the target connector properties. Connectors timeout when responses from the fabric exceed their response timeout value. Valid values are 300000–172800000. |
● responseTimeout |
Initiator, Target |
Connection Max Idle Time | 86400 seconds | The maximum idle time for the connection cache object, after which the object is closed and removed from the cache. Use this property when there are multiple concurrent users and queries running on the system that might lead to starvation of connection objects. Valid values are 1–86400 seconds. |
Target | |
Connection Pool Size | 100 | Maximum number of connection objects that can be stored in a connection pool. When acquiring a new connection, the connector checks for an available space in the pool. If no space is available in the connection pool, the connection fails after 5 minutes. Only one connection pool and username per connector configuration is allowed. Valid values are 1–10000. |
Target | |
Connection Evict Frequency | 30 minutes | Frequency of eviction checks. Connection objects from the pool are checked, closed, and removed if the idle time (current time - last time of use) of a connection object is greater than the Connection Max Idle Time setting. Reduce the time between checks if there are multiple concurrent users running queries to clear the connections more frequently. Valid values are 1–1440 minutes. |
Target |