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From "gaojinchao (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4124) ZK restarted while assigning a region, new active HM re-assign it but the RS warned 'already online on this server'.
Date Thu, 25 Aug 2011 02:07:29 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4124?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13090698#comment-13090698
] 

gaojinchao commented on HBASE-4124:
-----------------------------------

@ram
How come we have a dead RS if we dont kill the RS

gao: If you stop the cluster, The meta will handle the server information.

if the master is also killed how can the regions be assigned to some other RS 

gao: When master startup, it collects the regions on a same region server and 
     call sendRegionOpen(destination, regions).
     If the region is relatively large number, when region server opens the reigons needs
a long time.
     when master crash, the new master may reopen the regions on another region server.
     

> ZK restarted while assigning a region, new active HM re-assign it but the RS warned 'already
online on this server'.
> --------------------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-4124
>                 URL: https://issues.apache.org/jira/browse/HBASE-4124
>             Project: HBase
>          Issue Type: Bug
>          Components: master
>            Reporter: fulin wang
>            Assignee: gaojinchao
>             Fix For: 0.90.5
>
>         Attachments: HBASE-4124_Branch90V1_trial.patch, HBASE-4124_Branch90V2.patch,
HBASE-4124_Branch90V3.patch, log.txt
>
>   Original Estimate: 0.4h
>  Remaining Estimate: 0.4h
>
> ZK restarted while assigning a region, new active HM re-assign it but the RS warned 'already
online on this server'.
> Issue:
> The RS failed besause of 'already online on this server' and return; The HM can not receive
the message and report 'Regions in transition timed out'.

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