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From "Todd Lipcon (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-8212) Improve ActiveStandbyElector's behavior when session expires
Date Wed, 28 Mar 2012 20:33:27 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-8212?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Todd Lipcon updated HADOOP-8212:
--------------------------------

    Target Version/s: Auto Failover (HDFS-3042), 0.23.3, 0.24.0  (was: 0.24.0, 0.23.3)

Actually this turns to be difficult to revert since some other patches have modified this
same code afterward (eg the change in mock proxy creation). I will just target an amendment
patch at the branch, if that's OK.
                
> Improve ActiveStandbyElector's behavior when session expires
> ------------------------------------------------------------
>
>                 Key: HADOOP-8212
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8212
>             Project: Hadoop Common
>          Issue Type: Improvement
>    Affects Versions: 0.23.3, 0.24.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>             Fix For: 2.0.0
>
>         Attachments: hadoop-8212.txt, hadoop-8212.txt
>
>
> Currently when the ZK session expires, it results in a fatal error being sent to the
application callback. This is not the best behavior -- for example, in the case of HA, if
ZK goes down, we would like the current state to be maintained, rather than causing either
NN to abort. When the ZK clients are able to reconnect, they should sort out the correct leader
based on the normal locking schemes.

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