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From "Jeffrey Zhong (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-10085) Some regions aren't re-assigned after a master restarts
Date Fri, 06 Dec 2013 22:31:39 GMT

    [ https://issues.apache.org/jira/browse/HBASE-10085?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13841805#comment-13841805
] 

Jeffrey Zhong commented on HBASE-10085:
---------------------------------------

I checked in at the same time as your comments. The committed patch has updated format which
is from our Apache template auto formatting. 

The reason to restart whole cluster is that I need to trigger SSH on both old RSs(source RS
and dst RS in a region assignment) to repro the exact issue to verify the fix.

> Some regions aren't re-assigned after a master restarts
> -------------------------------------------------------
>
>                 Key: HBASE-10085
>                 URL: https://issues.apache.org/jira/browse/HBASE-10085
>             Project: HBase
>          Issue Type: Bug
>          Components: Region Assignment
>    Affects Versions: 0.96.1
>            Reporter: Jeffrey Zhong
>            Assignee: Jeffrey Zhong
>             Fix For: 0.98.0, 0.96.1
>
>         Attachments: hbase-10085.patch
>
>
> We see this issue happened in a cluster restart:
> 1) when shutdown a cluster, some regions are in offline state because no Region servers
are available(stop RS and then Master)
> 2) When the cluster restarts, the offlined regions are forced to be offline again and
SSH skip re-assigning them by function AM.processServerShutdown as shown below.
> {code}
> 2013-12-03 10:41:56,686 INFO  [master:h2-ubuntu12-sec-1386048659-hbase-8:60000] master.AssignmentManager:
Processing 873dbd8c269f44d0aefb0f66c5b53537 in state: M_ZK_REGION_OFFLINE
> 2013-12-03 10:41:56,686 DEBUG [master:h2-ubuntu12-sec-1386048659-hbase-8:60000] master.AssignmentManager:
RIT 873dbd8c269f44d0aefb0f66c5b53537 in state=M_ZK_REGION_OFFLINE was on deadserver; forcing
offline
> ...
> 2013-12-03 10:41:56,739 DEBUG [AM.-pool1-t8] master.AssignmentManager: Force region state
offline {873dbd8c269f44d0aefb0f66c5b53537 state=OFFLINE, ts=1386067316737, server=h2-ubuntu12-sec-1386048659-hbase-6.cs1cloud.internal,60020,1386066968696}
> ...
> 2013-12-03 10:41:57,223 WARN  [MASTER_SERVER_OPERATIONS-h2-ubuntu12-sec-1386048659-hbase-8:60000-3]
master.RegionStates: THIS SHOULD NOT HAPPEN: unexpected {873dbd8c269f44d0aefb0f66c5b53537
state=OFFLINE, ts=1386067316737, server=h2-ubuntu12-sec-1386048659-hbase-6.cs1cloud.internal,60020,1386066968696}

> {code}



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