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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-2342) Consider adding a watchdog node next to region server
Date Wed, 17 Mar 2010 23:30:27 GMT
Consider adding a watchdog node next to region server
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                 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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