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https://issues.apache.org/jira/browse/HBASE-5099?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13177991#comment-13177991
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Hudson commented on HBASE-5099:
-------------------------------
Integrated in HBase-0.92 #221 (See
[https://builds.apache.org/job/HBase-0.92/221/])
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
> 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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