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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