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From "nkeywal (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-6290) Add a function a mark a server as dead and start the recovery the process
Date Thu, 28 Jun 2012 16:39:44 GMT
nkeywal created HBASE-6290:

             Summary: Add a function a mark a server as dead and start the recovery the process
                 Key: HBASE-6290
                 URL: https://issues.apache.org/jira/browse/HBASE-6290
             Project: HBase
          Issue Type: Improvement
          Components: monitoring
    Affects Versions: 0.96.0
            Reporter: nkeywal
            Assignee: nkeywal
            Priority: Minor

ZooKeeper is used a a monitoring tool: we use znode and we start the recovery process when
a znode is deleted by ZK because it got a timeout. This timeout is defaulted to 90 seconds,
and often set to 30s

However, some HW issues could be detected by specialized hw monitoring tools before the ZK
timeout. For this reason, it makes sense to offer a very simple function to mark a RS as dead.
This should not take in

It could be a hbase shell function such as
considerAsDead ipAddress|serverName

This would delete all the znodes of the server running on this box, starting the recovery

Such a function would be easily callable (at callers risk) by any fault detection tool...
We could have issues to identify the right master & region servers around ipv4 vs ipv6
vs and multi networked boxes however.

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