[jira] [Created] (OOZIE-2206) Change Reaper mode on ChildReaper in ZKLocksService

["Ryota Egashira (JIRA)" <ji...@apache.org>]

Ryota Egashira created OOZIE-2206:
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             Summary: Change Reaper mode on ChildReaper in ZKLocksService
                 Key: OOZIE-2206
                 URL: https://issues.apache.org/jira/browse/OOZIE-2206
             Project: Oozie
          Issue Type: Bug
            Reporter: Ryota Egashira


OOZIE-1906 added znode cleanup thread.
currently passing Reaper.Mode.REAP_INDEFINITELY, but this enforce Oozie server to keep reaping znode even after znode is cleaned up.   This adds memory pressure on oozie server. Need to change to REAP_UNTIL_GONE  or REAP_UNTIL_DELETE
  
{code}
reaper = new ChildReaper(zk.getClient(), LOCKS_NODE, Reaper.Mode.REAP_INDEFINITELY, getExecutorService(), ConfigurationService.getInt(services.getConf(), REAPING_THRESHOLD) * 1000, REAPING_LEADER_PATH);
{code}

we hit one scenario where  one ZK quorum slows down for short period, causing many Zk locks not released properly, right after ChildReaper (every 5 min ) runs, which keep checking the list of Znode ever since, in the end, Oozie server hit OOM.




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