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Andrew Onischuk updated AMBARI-18006: ------------------------------------- Resolution: Fixed Status: Resolved (was: Patch Available) Committed to trunk > 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. -- This message was sent by Atlassian JIRA (v6.3.4#6332)