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https://issues.apache.org/jira/browse/HBASE-2342?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12846676#action_12846676
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ryan rawson commented on HBASE-2342:
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Run it as a parent process, thus ensuring via the OS level primitives that you
get notification of a process death. You can also aggressively set the ZK
timeout low (since it will be running in a low-GC pause process) and you can
tune the detection of a Juliet pause differently. Maybe you would accept a 30
second GC pause, it might be better than killing the processing, ensuring data
loss (pre HDFS-200) or otherwise causing unnecessary cluster churn.
> 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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