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From "Zhihong Yu (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5099) ZK event thread waiting for root region while server shutdown handler waiting for event thread to finish distributed log splitting to recover the region sever the root region is on
Date Thu, 29 Dec 2011 21:34:30 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5099?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13177404#comment-13177404
] 

Zhihong Yu commented on HBASE-5099:
-----------------------------------

@Jimmy:
Do you mind producing a patch for 0.92 ?
I got the following when I tried to apply patch v5 to 0.92:
{code}
1 out of 3 hunks FAILED -- saving rejects to file src/main/java/org/apache/hadoop/hbase/master/HMaster.java.rej
{code}

Also there is no test category in 0.92:
{code}
[ERROR] /Users/zhihyu/92hbase/src/test/java/org/apache/hadoop/hbase/master/TestMasterZKSessionRecovery.java:[27,30]
cannot find symbol
[ERROR] symbol  : class MediumTests
[ERROR] location: package org.apache.hadoop.hbase
{code}

This is a whitespace at line 41 in TestMasterZKSessionRecovery - I can remove it at time of
integration.

Nice work.
                
> ZK event thread waiting for root region while server shutdown handler waiting for event
thread to finish distributed log splitting to recover the region sever the root region is
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
>         Attachments: 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.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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