Michael Tamm created HBASE-12185:
------------------------------------
Summary: Deadlock in HConnectionManager$HConnectionImplementation
Key: HBASE-12185
URL: https://issues.apache.org/jira/browse/HBASE-12185
Project: HBase
Issue Type: Bug
Components: Client
Affects Versions: 0.94.2
Environment: CDH 4.2.0
Reporter: Michael Tamm
Priority: Critical
Here you can see the relevant section of a thread dump:
{noformat}
Found one Java-level deadlock:
=============================
"AsyncSave-700512-Worker-EventThread":
waiting to lock monitor 0x00007f8d90eecd20 (object 0x00000005c0a8e1d0, a
org.apache.hadoop.hbase.zookeeper.RootRegionTracker),
which is held by "AsyncSave-700546-Worker"
"AsyncSave-700546-Worker":
waiting to lock monitor 0x00007f8d90149700 (object 0x0000000571404180, a
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation),
which is held by "AsyncSave-700512-Worker-EventThread"
Java stack information for the threads listed above:
===================================================
"AsyncSave-700512-Worker-EventThread":
at
org.apache.hadoop.hbase.zookeeper.ZooKeeperNodeTracker.stop(ZooKeeperNodeTracker.java:98)
- waiting to lock <0x00000005c0a8e1d0> (a
org.apache.hadoop.hbase.zookeeper.RootRegionTracker)
at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.resetZooKeeperTrackers(HConnectionManager.java:603)
- locked <0x0000000571404180> (a
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation)
at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.abort(HConnectionManager.java:1681)
at
org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher.connectionEvent(ZooKeeperWatcher.java:389)
at
org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher.process(ZooKeeperWatcher.java:286)
at
org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:519)
at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:495)
"AsyncSave-700546-Worker":
at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.resetZooKeeperTrackers(HConnectionManager.java:598)
- waiting to lock <0x0000000571404180> (a
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation)
at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.abort(HConnectionManager.java:1681)
at
org.apache.hadoop.hbase.zookeeper.ZooKeeperNodeTracker.blockUntilAvailable(ZooKeeperNodeTracker.java:132)
- locked <0x00000005c0a8e1d0> (a
org.apache.hadoop.hbase.zookeeper.RootRegionTracker)
at
org.apache.hadoop.hbase.zookeeper.RootRegionTracker.waitRootRegionLocation(RootRegionTracker.java:83)
at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:841)
at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegionInMeta(HConnectionManager.java:954)
at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:852)
at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegionInMeta(HConnectionManager.java:954)
at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:856)
at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:813)
at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.processBatchCallback(HConnectionManager.java:1503)
at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.processBatch(HConnectionManager.java:1388)
at org.apache.hadoop.hbase.client.HTable.flushCommits(HTable.java:955)
at
org.apache.hadoop.hbase.client.HTablePool$PooledHTable.flushCommits(HTablePool.java:449)
at ...
{noformat}
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