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From "Jeffrey Zhong (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-9932) Remove Master Recovery handling when ZK session expired
Date Sat, 09 Nov 2013 02:18:17 GMT

    [ https://issues.apache.org/jira/browse/HBASE-9932?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13817947#comment-13817947
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Jeffrey Zhong commented on HBASE-9932:
--------------------------------------

[~saint.ack@gmail.com] How do you think about this? Thanks.

> Remove Master Recovery handling when ZK session expired
> -------------------------------------------------------
>
>                 Key: HBASE-9932
>                 URL: https://issues.apache.org/jira/browse/HBASE-9932
>             Project: HBase
>          Issue Type: Brainstorming
>            Reporter: Jeffrey Zhong
>
> Currently we use HMaster#tryRecoveringExpiredZKSession to allow master recovery from
a ZK session expired error. While this triggers to initialize HMaster partially, it is error
prone because it's hard to guarantee the half initialized master is in correct state. I found
several times already that the registered ZK listeners are different before & after a
fail over.
> Since we already have HA support, I'm proposing to remove this part handling. Though
we have a configuration setting "fail.fast.expired.active.master" to skip the logic, why not
go one stop further to clean the master code. 



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