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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-2342) Consider adding a watchdog node next to region server
Date Tue, 23 Mar 2010 06:14:27 GMT

    [ https://issues.apache.org/jira/browse/HBASE-2342?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12848559#action_12848559
] 

stack commented on HBASE-2342:
------------------------------

Another reponse on the thread talks of difficulty signalling imminent stop-the-world full
GC: http://permalink.gmane.org/gmane.comp.java.openjdk.hotspot.gc.devel/1680

> 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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