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From "Enis Soztutar (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-9468) Previous active master can still serves RPC request when it is trying recovering expired zk session
Date Tue, 10 Sep 2013 02:15:52 GMT

    [ https://issues.apache.org/jira/browse/HBASE-9468?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13762634#comment-13762634
] 

Enis Soztutar commented on HBASE-9468:
--------------------------------------

I think we should remove the recovering logic in the master from a zk session expiration.
Failing the master, and letting the backup masters take over and/or restart by the admin or
supervisor is simpler and more bullet proof. The masterRecovery parameter in HMaster#finishInitialization()
complicates things. 
                
> Previous active master can still serves RPC request when it is trying recovering expired
zk session
> ---------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-9468
>                 URL: https://issues.apache.org/jira/browse/HBASE-9468
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Feng Honghua
>
> When the active master's zk session expires, it'll try to recover zk session, but without
turn off its RpcServer. What if a previous backup master has already become the now active
master, and some client tries to send request to this expired master by using the cached master
info? Any problem here?

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