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https://issues.apache.org/jira/browse/DRILL-4768?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15371522#comment-15371522
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ASF GitHub Bot commented on DRILL-4768:
---------------------------------------
Github user sudheeshkatkam commented on the issue:
https://github.com/apache/drill/pull/543
Yes, we leak connections. There is a fix in Hive for [closing before
reconnecting](https://github.com/apache/hive/commit/8fb805225c9d6960c7d39d862de6b3326650551c),
but that is in a later version.
Also, there is another leak. The
[HiveStoragePlugin](https://github.com/apache/drill/blob/master/contrib/storage-hive/core/src/main/java/org/apache/drill/exec/store/hive/HiveStoragePlugin.java)
does not close connections (in HiveSchemaRegistry) when close is invoked. This
should be done in an overridden close method.
> Drill may leak hive meta store connection if hive meta store client call hits
> error
> -----------------------------------------------------------------------------------
>
> Key: DRILL-4768
> URL: https://issues.apache.org/jira/browse/DRILL-4768
> Project: Apache Drill
> Issue Type: Bug
> Components: Storage - Hive
> Reporter: Jinfeng Ni
> Assignee: Jinfeng Ni
>
> We are seeing one drillbit creates hundreds of connections to hive meta
> store. This indicates that drill is leaking those connection, and did not
> close those connections properly. When such leaking happens, it may prevent
> other applications from connecting to hive meta store.
> It seems one cause of leaking connection happens when hive meta store client
> call hits exception.
>
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