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Date: Sat, 31 Dec 2011 04:29:31 +0000 (UTC)
From: "Hudson (Commented) (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (HBASE-5099) ZK event thread waiting for root
 region assignment may block server shutdown handler for the region sever
 the root region was on
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    [ https://issues.apache.org/jira/browse/HBASE-5099?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13177890#comment-13177890 ] 

Hudson commented on HBASE-5099:
-------------------------------

Integrated in HBase-0.92-security #54 (See [https://builds.apache.org/job/HBase-0.92-security/54/])
    HBASE-5099 revert due to continuous 0.92 build failures
HBASE-5099  ZK event thread waiting for root region assignment may block server
               shutdown handler for the region sever the root region was on (Jimmy)

tedyu : 
Files : 
* /hbase/branches/0.92/CHANGES.txt
* /hbase/branches/0.92/src/main/java/org/apache/hadoop/hbase/master/HMaster.java
* /hbase/branches/0.92/src/test/java/org/apache/hadoop/hbase/master/TestMasterZKSessionRecovery.java

tedyu : 
Files : 
* /hbase/branches/0.92/CHANGES.txt
* /hbase/branches/0.92/src/main/java/org/apache/hadoop/hbase/master/HMaster.java
* /hbase/branches/0.92/src/test/java/org/apache/hadoop/hbase/master/TestMasterZKSessionRecovery.java

                
> ZK event thread waiting for root region assignment may block server shutdown handler for the region sever the root region was on
> --------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-5099
>                 URL: https://issues.apache.org/jira/browse/HBASE-5099
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.92.0, 0.94.0
>            Reporter: Jimmy Xiang
>            Assignee: Jimmy Xiang
>             Fix For: 0.92.0, 0.94.0
>
>         Attachments: 5099.92, ZK-event-thread-waiting-for-root.png, distributed-log-splitting-hangs.png, hbase-5099-v2.patch, hbase-5099-v3.patch, hbase-5099-v4.patch, hbase-5099-v5.patch, hbase-5099-v6.patch, hbase-5099.patch
>
>
> A RS died.  The ServerShutdownHandler kicked in and started the logspliting.  SpliLogManager
> installed the tasks asynchronously, then started to wait for them to complete.
> The task znodes were not created actually.  The requests were just queued.
> At this time, the zookeeper connection expired.  HMaster tried to recover the expired ZK session.
> During the recovery, a new zookeeper connection was created.  However, this master became the
> new master again.  It tried to assign root and meta.
> Because the dead RS got the old root region, the master needs to wait for the log splitting to complete.
> This waiting holds the zookeeper event thread.  So the async create split task is never retried since
> there is only one event thread, which is waiting for the root region assigned.

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