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Adds documentation for the Engine Pool feature to the `Share Level Of Kyuubi Engines` page. The separate and now-redundant `engine_pool.rst` file has been deleted. ### Why are the changes needed? The `Share Level Of Kyuubi Engines` documentation previously lacked a section on the Engine Pool feature. ### How was this patch tested? ### Was this patch authored or co-authored using generative AI tooling? Yes. Generative AI tools were used in several stages of preparing this contribution: - The initial draft of the documentation was written with the assistance of Claude. - Revisions and suggestions were provided by Gemini. - Commit messages and pull request descriptions were refined for clarity using Gemini. Generated-by: Claude 4, Gemini 2.5 pro Closes #7118 from z1131392774/docs/engine-pool-feature. Closes #7118 61892a22c [z1131392774] restore unnecessary style changes 02b4c6729 [z1131392774] ci: Re-trigger CI checks 60154e00a [z1131392774] fix with spotless 9f0700774 [z1131392774] docs: remove redundant engine_pool.md bf586f700 [z1131392774] update with SERVER_LOCAL and Engine Pool 4d34a5bfd [z1131392774] fix format with spotless 9ed2e8a61 [z1131392774] docs(client): Add comprehensive docs for Engine Pool feature Lead-authored-by: z1131392774 <z1131392774@gmail.com> Co-authored-by: z1131392774 <156416015+z1131392774@users.noreply.github.com> Signed-off-by: Cheng Pan <chengpan@apache.org>
261 lines
102 KiB
Markdown
261 lines
102 KiB
Markdown
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# The Share Level Of Kyuubi Engines
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The share level of Kyuubi engines describes the relationship between sessions and engines.
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It determines whether a new session can share an existing backend engine with other sessions or not.
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The sessions are also known as JDBC/ODBC/Thrift connections from clients that end-users create, and the engines are standalone applications with the full capabilities of Spark SQL, Flink SQL(under dev), running on single-node machines or clusters.
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The share level of Kyuubi engines works the same whether in HA or single node mode.
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In other words, an engine is cluster widely shared by all Kyuubi server peers if could.
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## Why do we need this feature?
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Apache Spark is a unified engine for large-scale data analytics.
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Using Spark to process data is like driving an all-wheel-drive hefty horsepower supercar.
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However,
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- Cars have their limit of 0-60 times.
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In a similar way, all Spark applications also have to warm up before go full speed.
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- Cars have a constant number of seats and are not allowed to be overloaded.
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Due to the master-slave architecture of Spark and the resource configured ahead, the overall workload of a single application is predictable.
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- Cars have various shapes to meet our needs.
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With this feature, Kyuubi give you a more flexible way to handle different big data workloads.
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## The current supported share levels
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The current supported share levels are,
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| Share Level | Syntax | Scenario | Isolation Degree | Shareability |
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|------------------|------------------------------|------------------------------|----------------------------------------------|-----------------------|
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| **CONNECTION** | One engine per session | Large-scale ETL </br> Ad hoc | High | Low |
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| **USER** | One engine per user | Ad hoc </br> Small-scale ETL | Medium | Medium |
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| **GROUP** | One engine per primary group | Ad hoc </br> Small-scale ETL | Low | High |
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| **SERVER_LOCAL** | One engine per Kyuubi server | Resource load balancing | Very Low | Very High |
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| **SERVER** | One engine per cluster | Admin | Highest If Secured </br> Lowest If Unsecured | Admin ONLY If Secured |
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- Better isolation degree of engines gives us better stability of an engine and the query executions running on it.
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- Better shareability of engines means we are more likely to reuse an engine which is already in full speed.
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### CONNECTION
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</diagram></mxfile>"}"></div>
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<script type="text/javascript" src="https://viewer.diagrams.net/js/viewer-static.min.js"></script>
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</body>
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<div align=center>
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*Figure.1 CONNECTION Share Level*
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</div>
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Each session with CONNECTION share level has a standalone engine for itself which is unreachable for anyone else.
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Within the session, a user or client can send multiple operation request, including metadata calls or queries, to the corresponding engine.
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Although it is still an interactive form, this model does allow for more practical batch processing jobs as well.
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When closing session, the corresponding engine will be shutdown at the same time.
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### USER(Default)
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</diagram></mxfile>"}"></div>
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<script type="text/javascript" src="https://viewer.diagrams.net/js/viewer-static.min.js"></script>
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</body>
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<div align=center>
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*Figure.2 USER Share Level*
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</div>
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All sessions with USER share level use the same engine if and only if the session user is the same.
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Those sessions share the same engine with objects belong to the one and only `SparkContext` instance, including `Classes/Classloaders`, `SparkConf`, `Driver`/`Executor`s, `Hive Metastore Client`, etc.
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But each session can still have its own `SparkSession` instance, which contains separate session state, including temporary views, SQL config, UDFs etc.
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Setting `kyuubi.engine.single.spark.session` to true will make `SparkSession` instance a singleton and share across sessions.
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When closing session, the corresponding engine will not be shutdown.
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When all sessions are closed, the corresponding engine still has a time-to-live lifespan.
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This TTL allows new sessions to be established quickly without waiting for the engine to start.
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### GROUP
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</diagram></mxfile>"}"></div>
|
|
<script type="text/javascript" src="https://viewer.diagrams.net/js/viewer-static.min.js"></script>
|
|
</body>
|
|
<div align=center>
|
|
|
|
*Figure.3 GROUP Share Level*
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|
|
|
</div>
|
|
|
|
An engine will be shared by all sessions created by all users belong to the same primary group name.
|
|
The engine will be launched by the group name as the effective username, so here the group name is kind of special user who is able to visit the compute resources/data of a team.
|
|
It follows the [Hadoop GroupsMapping](https://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-common/GroupsMapping.html) to map user to a primary group. If the primary group is not found, it falls back to the USER level.
|
|
|
|
The mechanisms of `SparkContext`, `SparkSession` and TTL works similarly to USER share level.
|
|
|
|
Here is an example to configure `HadoopGroupProvider` to use LDAP-based group mapping.
|
|
1. Add the properties shown in the example below to the `core-site.xml` file. You will need to provide the value for the bind user, the bind password, and other properties specific to your LDAP instance, and make sure that object class, user, and group filters match the values specified in your LDAP instance.
|
|
|
|
```xml
|
|
<property>
|
|
<name>hadoop.security.group.mapping</name>
|
|
<value>org.apache.hadoop.security.LdapGroupsMapping</value>
|
|
</property>
|
|
|
|
<property>
|
|
<name>hadoop.security.group.mapping.ldap.url</name>
|
|
<value>ldap://localhost:389</value>
|
|
</property>
|
|
|
|
<property>
|
|
<name>hadoop.security.group.mapping.ldap.base</name>
|
|
<value>dc=example,dc=com</value>
|
|
</property>
|
|
|
|
<property>
|
|
<name>hadoop.security.group.mapping.ldap.bind.user</name>
|
|
<value>cn=Manager,dc=example,dc=com</value>
|
|
</property>
|
|
|
|
<property>
|
|
<name>hadoop.security.group.mapping.ldap.bind.password</name>
|
|
<value>example</value>
|
|
</property>
|
|
|
|
<property>
|
|
<name>hadoop.security.group.mapping.ldap.search.filter.user</name>
|
|
<value>(&(objectClass=posixAccount)(cn={0}))</value>
|
|
</property>
|
|
|
|
<property>
|
|
<name>hadoop.security.group.mapping.ldap.search.filter.group</name>
|
|
<value>(objectClass=posixGroup)</value>
|
|
</property>
|
|
|
|
<property>
|
|
<name>hadoop.security.group.mapping.ldap.search.attr.member</name>
|
|
<value>memberuid</value>
|
|
</property>
|
|
|
|
<property>
|
|
<name>hadoop.security.group.mapping.ldap.search.attr.group.name</name>
|
|
<value>cn</value>
|
|
</property>
|
|
```
|
|
|
|
2. Use the applicable instructions to re-start the HDFS NameNode and the YARN ResourceManager.
|
|
3. Verify LDAP group mapping by running the `hdfs groups` command. This command will fetch groups from LDAP for the current user. Note that with LDAP group mapping configured, the HDFS permissions can leverage groups defined in LDAP for access control.
|
|
|
|
**Tips for authorization in GROUP share level**:
|
|
|
|
The session user and the primary group name(as sparkUser/execute user) will be both accessible at engine-side.
|
|
By default, the sparkUser will be used to check the YARN/HDFS ACLs.
|
|
If you want fine-grained access control for session user, you need to get it from `SparkContext.getLocalProperty("kyuubi.session.user")` and send it to security service, like Apache Ranger.
|
|
|
|
### SERVER_LOCAL
|
|
|
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MS;fontSize=14;fontColor=#330000;elbow=vertical;strokeColor=#B266FF;strokeWidth=3;\" parent=\"1\" edge=\"1\">\n <mxGeometry width=\"50\" height=\"50\" relative=\"1\" as=\"geometry\">\n <mxPoint x=\"230\" y=\"708\" as=\"sourcePoint\" />\n <mxPoint x=\"413\" y=\"670\" as=\"targetPoint\" />\n <Array as=\"points\">\n <mxPoint x=\"240\" y=\"708\" />\n <mxPoint x=\"413\" y=\"710\" />\n </Array>\n </mxGeometry>\n </mxCell>\n <mxCell id=\"iYp413I9VlZigljaK2V1-54\" value=\"\" style=\"endArrow=none;dashed=1;html=1;rounded=0;fontFamily=Comic Sans MS;fontSize=14;fontColor=#330000;elbow=vertical;exitX=0.5;exitY=1;exitDx=0;exitDy=0;strokeColor=#B266FF;strokeWidth=3;\" parent=\"1\" edge=\"1\" source=\"HtqI43X2x09Ri4B_hNKH-2\">\n <mxGeometry width=\"50\" height=\"50\" relative=\"1\" as=\"geometry\">\n <mxPoint x=\"733.8600000000001\" y=\"731\" as=\"sourcePoint\" />\n <mxPoint x=\"733.5\" y=\"670\" as=\"targetPoint\" />\n <Array as=\"points\">\n <mxPoint x=\"610\" y=\"708\" />\n <mxPoint x=\"734\" y=\"708\" />\n </Array>\n </mxGeometry>\n </mxCell>\n </root>\n </mxGraphModel>\n </diagram>\n</mxfile>\n"}"></div>
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<script type="text/javascript" src="https://viewer.diagrams.net/js/viewer-static.min.js"></script>
|
|
</body>
|
|
<div align=center>
|
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|
|
*Figure.4 SERVER_LOCAL Share Level*
|
|
|
|
</div>
|
|
|
|
An engine with SERVER_LOCAL share level is private to a single Kyuubi Server instance and is shared by all user sessions
|
|
on that instance.In this mode, an engine instance is created when it is first needed by the Kyuubi Server and is
|
|
associated with the host address of that server.
|
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|
|
### SERVER
|
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|
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</diagram></mxfile>"}"></div>
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<script type="text/javascript" src="https://viewer.diagrams.net/js/viewer-static.min.js"></script>
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</body>
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<div align=center>
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*Figure.5 SERVER Share Level*
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</div>
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Literally, this model is similar to Spark Thrift Server with High availability.
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### Subdomain
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For USER, GROUP, or SERVER share levels, you can further use `kyuubi.engine.share.level.subdomain` to isolate the engine.
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That is, you can also create multiple engines for a single user, group or server(cluster).
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For example, in USER share level, you can use `kyuubi.engine.share.level.subdomain=sd1` and `kyuubi.engine.share.level.subdomain=sd2` to create two standalone engines for user `Tom`.
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The `kyuubi.engine.share.level.subdomain` shall be configured in the JDBC connection URL to tell the Kyuubi server which engine you want to use.
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### Engine Pool
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Engine pool works by creating multiple engine subdomains (e.g.,
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`engine-pool-0`, `engine-pool-1`) and distributing sessions across these
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subdomains.
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The Engine Pool's configurations will not take effect when `kyuubi.engine.share.level.subdomain` is set
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or `kyuubi.engine.share.level` is set as `CONNECTION`.
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### Hybrid
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All supported share levels can be used together in a single Kyuubi server or cluster.
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## Related Configurations
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- kyuubi.engine.share.level(kyuubi.session.engine.share.level)
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- Default: USER
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- Candidates: USER, CONNECTION, GROUP, SERVER_LOCAL, SERVER
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- Meaning: The base level for how an engine is created, cached and shared to sessions.
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- Usage: It can be set both in the server configuration file and also connection URL. The latter has higher priority.
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- kyuubi.session.engine.idle.timeout
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- Default: PT30M (30 min)
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- Candidates: a proper timeout
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- Meaning: Time to live since engine becomes idle
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- Usage: It can be set both in the server configuration file and also connection URL. The latter has higher priority.
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- kyuubi.engine.share.level.subdomain(kyuubi.engine.share.level.sub.domain)
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- Default: <none>
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- Candidates: a valid zookeeper a child node
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- Meaning: Add a subdomain under the base level to make further isolation for engines
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- Usage: It can be set both in the server configuration file and also connection URL. The latter has higher priority.
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- kyuubi.engine.pool.size
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- Default: -1
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- Candidates: a positive integer
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- Meaning: The number of engine pools
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- Usage: It can be set both in the server configuration file and also connection URL. The latter has higher priority.
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- kyuubi.engine.pool.name
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- Default: engine-pool
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- Candidates: a valid name
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- Meaning: The name of the engine pool
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- Usage: It can be set both in the server configuration file and also connection URL. The latter has higher priority.
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- kyuubi.engine.pool.selectPolicy
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- Default: RANDOM
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- Candidates: RANDOM, POLLING
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- Meaning: The selection policy of the engine pool
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- Usage: It can be set both in the server configuration file and also connection URL. The latter has higher priority.
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- kyuubi.engine.pool.size.threshold
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- Default: 9
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- Candidates: a positive integer
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- Meaning: The threshold of the engine pool size
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- Usage: It can be set only in the server configuration file.
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## Conclusion
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With this feature, end-users are able to leverage engines in different ways to handle their different workloads, such as large-scale ETL jobs and interactive ad hoc queries.
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