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https://issues.apache.org/jira/browse/HBASE-7933?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13586695#comment-13586695
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Enis Soztutar commented on HBASE-7933:
--------------------------------------
I think the bug is a race condition for the parent znode for the table.
TableLockManager#tableDeleted() deletes parent znode, so that we do not leak
znodes for deleted tables.
{code}
2013-02-25 13:42:09,294 DEBUG
[MASTER_TABLE_OPERATIONS-10.11.3.82,54545,1361828508393-0]
master.TableLockManager$ZKTableLockManager$TableLockImpl(253): Attempt to
release table write lock on :test
2013-02-25 13:42:09,298 DEBUG [IPC Server handler 3 on 54545]
master.TableLockManager$ZKTableLockManager$TableLockImpl(225): Attempt to
acquire table write lock on :test for:C_M_CREATE_TABLE
2013-02-25 13:42:09,309 DEBUG
[MASTER_TABLE_OPERATIONS-10.11.3.82,54545,1361828508393-0]
lock.ZKInterProcessLockBase(296): Successfully released
/hbase/table-lock/test/write-master:545450000000002
2013-02-25 13:42:09,309 DEBUG
[MASTER_TABLE_OPERATIONS-10.11.3.82,54545,1361828508393-0]
master.TableLockManager$ZKTableLockManager$TableLockImpl(269): Released table
lock on :test
2013-02-25 13:42:09,309 INFO [IPC Server handler 3 on 54545]
zookeeper.RecoverableZooKeeper(460): Node /hbase/table-lock/test already exists
and this is not a retry
2013-02-25 13:42:09,311 WARN [IPC Server handler 3 on 54545]
lock.ZKInterProcessLockBase(229): Failed to create znode:
/hbase/table-lock/test/write-
org.apache.zookeeper.KeeperException$NoNodeException: KeeperErrorCode = NoNode
for /hbase/table-lock/test/write-master:54545
at org.apache.zookeeper.KeeperException.create(KeeperException.java:111)
at org.apache.zookeeper.KeeperException.create(KeeperException.java:51)
at org.apache.zookeeper.ZooKeeper.create(ZooKeeper.java:783)
at
org.apache.hadoop.hbase.zookeeper.RecoverableZooKeeper.createSequential(RecoverableZooKeeper.java:496)
at
org.apache.hadoop.hbase.zookeeper.RecoverableZooKeeper.create(RecoverableZooKeeper.java:427)
at
org.apache.hadoop.hbase.zookeeper.ZKUtil.createNodeIfNotExistsNoWatch(ZKUtil.java:1069)
{code}
> NPE in TableLockManager
> -----------------------
>
> Key: HBASE-7933
> URL: https://issues.apache.org/jira/browse/HBASE-7933
> Project: HBase
> Issue Type: Bug
> Components: master, Zookeeper
> Reporter: Enis Soztutar
> Assignee: Enis Soztutar
> Fix For: 0.96.0
>
>
> We are getting NPE in TableLockManager sometimes in tests.
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