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From "Himanshu Vashishtha (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8357) current region server failover mechanism for replication can lead to stale region server whose left hlogs can't be replicated by other region server
Date Thu, 18 Apr 2013 14:29:24 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8357?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13635201#comment-13635201
] 

Himanshu Vashishtha commented on HBASE-8357:
--------------------------------------------

[~fenghh] Also, consider using 0.94.6 when using HBase-2611. Please refer to the release notes
on HBase-2611.
                
> current region server failover mechanism for replication can lead to stale region server
whose left hlogs can't be replicated by other region server
> ----------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-8357
>                 URL: https://issues.apache.org/jira/browse/HBASE-8357
>             Project: HBase
>          Issue Type: Bug
>          Components: Replication
>    Affects Versions: 0.94.3
>            Reporter: Feng Honghua
>
> consider this scenario: rs A/B/C, A dies, B and C race to lock A to help replicate A's
left unreplicated hlogs, B wins and successfully creates lock under A's znode, but before
B copies A's hlog queues to its own znode, B also dies, and C successfully creates lock under
B's znode and helps replicate B's own left hlogs. But A's left hlogs can't be replicated by
any other rs since B left back a lock under A's znode and B didn't transfer A's hlog queues
to its own znode before B dies.

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