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From "Jean-Daniel Cryans (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HBASE-1575) HMaster does not handle ZK session expiration
Date Tue, 07 Jul 2009 13:14:15 GMT

     [ https://issues.apache.org/jira/browse/HBASE-1575?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jean-Daniel Cryans updated HBASE-1575:
--------------------------------------

    Attachment: hbase-1575.patch

While playing with Master restart, I found that it was very difficult to do since stopping
the threads always seemed to stop the region servers. Also the visibility in RegionManager
isn't great. So, since it's critical that a Master who lost its znode should stop managing
the cluster, I make it kill itself. Someone who really needs a restart can still do it via
cluster management, or we can do it cleanly for 0.21, or both.

> HMaster does not handle ZK session expiration
> ---------------------------------------------
>
>                 Key: HBASE-1575
>                 URL: https://issues.apache.org/jira/browse/HBASE-1575
>             Project: Hadoop HBase
>          Issue Type: Bug
>          Components: master
>            Reporter: Jean-Daniel Cryans
>            Assignee: Jean-Daniel Cryans
>            Priority: Critical
>             Fix For: 0.20.0
>
>         Attachments: hbase-1575.patch
>
>
> Currently the master does nothing when he gets a KeeperState.Expired event from ZK. That
means that a new master will be elected but the other will still be there doing weird stuff.

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