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From "Jimmy Xiang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8144) Limit number of attempts to assign a region
Date Tue, 26 Mar 2013 17:39:16 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8144?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13614341#comment-13614341
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Jimmy Xiang commented on HBASE-8144:
------------------------------------


bq.  With this patch we may try to reassign to another RS (may be double assignment), without
this patch we may not update the master's memory.

Agree.  If we are very unlucky, closeRegion fails in competing with OpenRegionHandler, there
could be double-assignment. I will attach a new patch to close the region again in AM#handleRegion,
just in case.
                
> Limit number of attempts to assign a region
> -------------------------------------------
>
>                 Key: HBASE-8144
>                 URL: https://issues.apache.org/jira/browse/HBASE-8144
>             Project: HBase
>          Issue Type: Bug
>          Components: Region Assignment
>            Reporter: Jimmy Xiang
>            Assignee: Jimmy Xiang
>            Priority: Minor
>             Fix For: 0.95.0, 0.98.0
>
>         Attachments: trunk-8144.patch, trunk-8144_v2.patch, trunk-8144_v3.patch
>
>
> In sending a region open request to a region server, we make sure we try at most some
configured times.  However, once the request is accepted by the region server, the region
could go through this transition forever: failed_open (in ZK) => closed => opening =>
failed_open (in ZK), assuming no RPC/network issue.
> It will be good to break the loop and limit the number of tries and move the region to
failed_open state (will be introduced in HBASE-8137)

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