[
https://issues.apache.org/jira/browse/HIVE-26399?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Yu-Wen Lai resolved HIVE-26399.
-------------------------------
Resolution: Won't Do
I found toggling this property sometimes causes db operations never end, but I
cannot figure out why at this time. So, I will just close this ticket.
> 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
> Labels: pull-request-available
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> 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
>
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
