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https://issues.apache.org/jira/browse/HBASE-2342?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12847772#action_12847772
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stack commented on HBASE-2342:
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More:
{code}
Jon Masamitsu <[email protected]>
date Fri, Mar 19, 2010 at 10:11 PM
subject Re: Using CMS, any chance of forewarning a serial full GC is imminent?
So it's a fragmentation issue. If you haven't seen
http://blogs.sun.com/jonthecollector/entry/what_the_heck_s_a
it might help. Also try CMS in 6u20. It has some improvements for
reducing fragmentation.
{code}
> Consider adding a watchdog node next to region server
> -----------------------------------------------------
>
> Key: HBASE-2342
> URL: https://issues.apache.org/jira/browse/HBASE-2342
> Project: Hadoop HBase
> Issue Type: New Feature
> Components: regionserver
> Reporter: Todd Lipcon
>
> This idea has been bandied about a fair amount. The concept is to add a
> second java process that runs next to each region server to act as a
> watchdog. Several possible purposes:
> - monitor the RS for liveness - if it exhibits Juliet syndrome ("appears
> dead") then we kill it agressively to prevent it from coming back to life
> - restart RS automatically in failure cases
> - potentially move the entire ZK session to the watchdog to decouple node
> liveness from the particular JVM liveness
> Let's discuss in this JIRA.
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