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https://issues.apache.org/jira/browse/OOZIE-3722?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dénes Bodó reassigned OOZIE-3722:
---------------------------------
Assignee: (was: Dénes Bodó)
> Workflow actions can stuck in RUNNING state when DB connections are killed on
> the DB side
> -----------------------------------------------------------------------------------------
>
> Key: OOZIE-3722
> URL: https://issues.apache.org/jira/browse/OOZIE-3722
> Project: Oozie
> Issue Type: Bug
> Components: core
> Affects Versions: 5.2.1
> Reporter: Dénes Bodó
> Priority: Critical
>
> Apache Oozie 5.2.1 uses OpenJPA 2.4.2 and commons-dbcp 1.4 and commons-pool
> 1.5.4. These are ancient versions, I know.
> h1. Description
> The issue is that when due to some network issues or "maintenance work" on
> the DB side (especially PostgreSQL) which causes the DB connection to be
> closed, it results exhausted Pool on the client side. Many threads are
> waiting at this point:
> {noformat}
> "pool-2-thread-4" #20 prio=5 os_prio=31 tid=0x00007faf7903b800 nid=0x8603
> waiting on condition [0x000000030f3e7000]
> java.lang.Thread.State: WAITING (parking)
> at sun.misc.Unsafe.park(Native Method)
> - parking to wait for <0x000000066aca8e70> (a
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
> at
> org.apache.commons.pool2.impl.LinkedBlockingDeque.takeFirst(LinkedBlockingDeque.java:1324)
> {noformat}
> According to my observation this is because the JDBC driver does not get
> closed on the client side, nor the abstract DBCP connection
> _org.apache.commons.dbcp2.PoolableConnection_ .
>
> This issue can cause workflow actions stuck in RUNNING state because the
> thread which would update the DB after XActionExecutor.check() doesn't get a
> connection causing the thread stuck infinitely.
>
> h1. Workaround
> Restarts Oozie and/or fix the DB/network issue.
> h1. Repro
> (Un)Fortunately I can reproduce the issue using the latest and greatest
> commons-dbcp 2.11.0 and commons-pool 2.12.0 along with OpenJPA 3.2.2.
> I've just created a Java application to reproduce the issue:
> [https://github.com/dionusos/pool_exhausted_repro] . See README.md for
> detailed repro steps.
>
> DBCP-595 was created to ask for help from DBCP/Pool teams. I am working on
> the case to provide them the necessary information.
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