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Posted to issues@hive.apache.org by "Yu-Wen Lai (Jira)" <ji...@apache.org> on 2022/07/15 19:23:00 UTC
[jira] [Assigned] (HIVE-26399) Make DataNucleus use existing connection for value generation
[ https://issues.apache.org/jira/browse/HIVE-26399?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Yu-Wen Lai reassigned HIVE-26399:
---------------------------------
> Make DataNucleus use existing connection for value generation
> -------------------------------------------------------------
>
> Key: HIVE-26399
> URL: https://issues.apache.org/jira/browse/HIVE-26399
> Project: Hive
> Issue Type: Improvement
> Components: Metastore
> Reporter: Yu-Wen Lai
> Assignee: Yu-Wen Lai
> Priority: Major
>
> DataNucleus by default uses a new connection for value generation, so for one thread it might take two connections at a time. That causes a problem when there are many concurrent requests coming in HMS. If all threads are waiting for a new connection, then no threads can proceed.
> We can set datanucleus.valuegeneration.transactionAttribute to "EXISTING" so that DataNucleus will take existing connection rather than request a new one from pool.
> Ref:
> https://www.datanucleus.org/products/accessplatform/jdo/persistence.html#pmf_properties
>
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