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Posted to issues@hbase.apache.org by "ramkrishna.s.vasudevan (Assigned) (JIRA)" <ji...@apache.org> on 2011/11/30 02:25:41 UTC
[jira] [Assigned] (HBASE-4729) Clash between region unassign and
splitting kills the master
[ https://issues.apache.org/jira/browse/HBASE-4729?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
ramkrishna.s.vasudevan reassigned HBASE-4729:
---------------------------------------------
Assignee: stack (was: ramkrishna.s.vasudevan)
Assigning to your name Stack.
> Clash between region unassign and splitting kills the master
> ------------------------------------------------------------
>
> Key: HBASE-4729
> URL: https://issues.apache.org/jira/browse/HBASE-4729
> Project: HBase
> Issue Type: Bug
> Affects Versions: 0.92.0
> Reporter: Jean-Daniel Cryans
> Assignee: stack
> Priority: Critical
> Fix For: 0.92.0, 0.94.0
>
> Attachments: 4729-v2.txt, 4729-v3.txt, 4729-v4.txt, 4729-v5.txt, 4729-v6-092.txt, 4729-v6-trunk.txt, 4729.txt
>
>
> I was running an online alter while regions were splitting, and suddenly the master died and left my table half-altered (haven't restarted the master yet).
> What killed the master:
> {quote}
> 2011-11-02 17:06:44,428 FATAL org.apache.hadoop.hbase.master.HMaster: Unexpected ZK exception creating node CLOSING
> org.apache.zookeeper.KeeperException$NodeExistsException: KeeperErrorCode = NodeExists for /hbase/unassigned/f7e1783e65ea8d621a4bc96ad310f101
> at org.apache.zookeeper.KeeperException.create(KeeperException.java:110)
> at org.apache.zookeeper.KeeperException.create(KeeperException.java:42)
> at org.apache.zookeeper.ZooKeeper.create(ZooKeeper.java:637)
> at org.apache.hadoop.hbase.zookeeper.RecoverableZooKeeper.createNonSequential(RecoverableZooKeeper.java:459)
> at org.apache.hadoop.hbase.zookeeper.RecoverableZooKeeper.create(RecoverableZooKeeper.java:441)
> at org.apache.hadoop.hbase.zookeeper.ZKUtil.createAndWatch(ZKUtil.java:769)
> at org.apache.hadoop.hbase.zookeeper.ZKAssign.createNodeClosing(ZKAssign.java:568)
> at org.apache.hadoop.hbase.master.AssignmentManager.unassign(AssignmentManager.java:1722)
> at org.apache.hadoop.hbase.master.AssignmentManager.unassign(AssignmentManager.java:1661)
> at org.apache.hadoop.hbase.master.BulkReOpen$1.run(BulkReOpen.java:69)
> at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> at java.lang.Thread.run(Thread.java:662)
> {quote}
> A znode was created because the region server was splitting the region 4 seconds before:
> {quote}
> 2011-11-02 17:06:40,704 INFO org.apache.hadoop.hbase.regionserver.SplitTransaction: Starting split of region TestTable,0012469153,1320253135043.f7e1783e65ea8d621a4bc96ad310f101.
> 2011-11-02 17:06:40,704 DEBUG org.apache.hadoop.hbase.regionserver.SplitTransaction: regionserver:62023-0x132f043bbde0710 Creating ephemeral node for f7e1783e65ea8d621a4bc96ad310f101 in SPLITTING state
> 2011-11-02 17:06:40,751 DEBUG org.apache.hadoop.hbase.zookeeper.ZKAssign: regionserver:62023-0x132f043bbde0710 Attempting to transition node f7e1783e65ea8d621a4bc96ad310f101 from RS_ZK_REGION_SPLITTING to RS_ZK_REGION_SPLITTING
> ...
> 2011-11-02 17:06:44,061 DEBUG org.apache.hadoop.hbase.zookeeper.ZKAssign: regionserver:62023-0x132f043bbde0710 Successfully transitioned node f7e1783e65ea8d621a4bc96ad310f101 from RS_ZK_REGION_SPLITTING to RS_ZK_REGION_SPLIT
> 2011-11-02 17:06:44,061 INFO org.apache.hadoop.hbase.regionserver.SplitTransaction: Still waiting on the master to process the split for f7e1783e65ea8d621a4bc96ad310f101
> {quote}
> Now that the master is dead the region server is spewing those last two lines like mad.
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