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From "Bikas Saha (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8212) Improve ActiveStandbyElector's behavior when session expires
Date Tue, 27 Mar 2012 08:05:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8212?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13239297#comment-13239297
] 

Bikas Saha commented on HADOOP-8212:
------------------------------------

I think we want to added similar handling in the StatCallback. Its another race waiting to
happen.

The comment on processWatchEvent needs to change slightly to reflect that its the proxied
watcher callback handler.

bq.Sure, happy to address post-commit. Sorry for moving quick - trying to get at least an
initial implementation of auto failover committed quickly, and we can continue to improve
and fix it up.
Whats the hurry?
                
> 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: 0.23.3, 0.24.0
>
>         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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