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From "Nick Dimiduk (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12467) Master joins cluster but never completes initialization
Date Wed, 10 Dec 2014 01:11:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12467?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14240454#comment-14240454
] 

Nick Dimiduk commented on HBASE-12467:
--------------------------------------

Thanks [~apurtell].

> Master joins cluster but never completes initialization
> -------------------------------------------------------
>
>                 Key: HBASE-12467
>                 URL: https://issues.apache.org/jira/browse/HBASE-12467
>             Project: HBase
>          Issue Type: Bug
>          Components: master
>            Reporter: Nick Dimiduk
>            Assignee: Nick Dimiduk
>             Fix For: 1.0.0, 2.0.0, 0.98.9
>
>         Attachments: HBASE-12467.00.patch, HBASE-12467.00.patch, HBASE-12467.01.patch,
HBASE-12467.01.patch
>
>
> While diagnosing a rare failure in IntegrationTestLoadAndVerify, I discovered this scenario.
Master was restarted by CM. Upon rejoining the cluster it successfully assumes responsibility
as active master, but apparently the finishInitialization method never completes. The last
log line from that thread is
> {noformat}
> 2014-11-10 17:01:29,940 INFO  [master:ip-172-31-9-135:60000] master.HMaster: hbase:meta
with replicaId 0 assigned=0, rit=false, location=ip-172-31-9-136.ec2.internal,60020,1415638551951
> {noformat}
> I see region states populated from existing znodes. AM inventoried the online regions,
acknowledged that this was master failover. There it sits, responding to RPC's with {{PleaseHoldException:
Master is initializing}}.
> For the sake of resiliency, we should detect this scenario and at least release control
as active master.



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