Andrew Onischuk created AMBARI-18006:
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Summary: Tune HDFS opts parameters to trigger GC more predicitably
Key: AMBARI-18006
URL: https://issues.apache.org/jira/browse/AMBARI-18006
Project: Ambari
Issue Type: Bug
Reporter: Andrew Onischuk
Assignee: Andrew Onischuk
Fix For: 3.0.0
Attachments: AMBARI-18006.patch
DN Heap usage alert is set to 80% warning and 90% critical. This alert is
causing a lot of alerts to be fired off and needs to be tuned.
One thing we need to make sure is that DN gc is happening. I am not sure at
what % of heap usage will the gc be fired but we need to make sure our alerts
are for a % higher than that as when i manually ran a GC the heap usage went
below the threshold.
Based on discussions with hdfs dev's it was determined we should be adding the
following
XX:+UseCMSInitiatingOccupancyOnly and
-XX:CMSInitiatingOccupancyFraction=<percent>
to the namenode and datanode opts. Based on this setting hopefully we can also
determine what % to set the alerts to.
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