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From "Zhou wenjian (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6473) deletedtable is not deleted completely, some region may be still online
Date Thu, 02 Aug 2012 02:57:02 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6473?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13427083#comment-13427083
] 

Zhou wenjian commented on HBASE-6473:
-------------------------------------

@Jimmy Xiang.
You mean check the region state in rit to see it is offline? Region maybe is not in rit when
delete table occours.
And i do not quite follow the reason we check the region in rit offline.

Do you have a email? I suggest we discuss it personally
                
> deletedtable is not deleted completely, some region may be still online
> -----------------------------------------------------------------------
>
>                 Key: HBASE-6473
>                 URL: https://issues.apache.org/jira/browse/HBASE-6473
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.94.0
>            Reporter: zhou wenjian
>             Fix For: 0.96.0, 0.94.2
>
>         Attachments: HBASE-6473-trunk.patch
>
>
> consider such Scenario:
> we have a table called T1, which has 1 regions: A 
> 1. move A from rs1 to rs2,and A is now closed
> 2. disable T1,
> 3. delete  T1.
> when we disable T1, disable handler will just set the zk to disabled and A will still
be assigned. when Ais opened, A in transition will be clean out. 
> At that time, Deletetable found it is safe to delete all regions and table in meta and
fs , it will also delete the zk node of T1.
> {code}
> while (System.currentTimeMillis() < done) {
>         AssignmentManager.RegionState rs = am.isRegionInTransition(region);
>         if (rs == null) break;
>         Threads.sleep(waitingTimeForEvents);
>         LOG.debug("Waiting on  region to clear regions in transition; " + rs);
>       }
>       if (am.isRegionInTransition(region) != null) {
>         throw new IOException("Waited hbase.master.wait.on.region (" +
>           waitTime + "ms) for region to leave region " +
>           region.getRegionNameAsString() + " in transitions");
>       }
> {code}
> however A is still being unassigned, when it finished closed the A,it finds that the
disabled state in zk is deleted, and then A will be assigned again.

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