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https://issues.apache.org/jira/browse/HBASE-3336?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Purtell resolved HBASE-3336.
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Resolution: Implemented
Recent versions of HBase have a sleeper that will warn if it misses scheduled
wakeup substantially, and will print GC collection times by collector.
> Make GC pauses more obvious to users
> ------------------------------------
>
> Key: HBASE-3336
> URL: https://issues.apache.org/jira/browse/HBASE-3336
> Project: HBase
> Issue Type: Improvement
> Components: regionserver
> Affects Versions: 0.92.0
> Reporter: Todd Lipcon
>
> We often see users hit GC pauses, but it's not obvious to them what happened.
> I propose we add a "GCMonitor" thread which wakes up every few seconds and
> checks (a) that it slept for around the right amount of time, and (b) uses
> the JVM GC metrics to see if there was a long pause. If a long pause is
> detected we should output a very loud and obnoxious message to the logs
> indicating that a length GC pause occurred, and point to a wiki page on the
> topic.
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