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From "Gopinathan A (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-6088) Region splitting not happened for long time due to ZK exception while creating RS_ZK_SPLITTING node
Date Thu, 24 May 2012 13:34:02 GMT
Gopinathan A created HBASE-6088:
-----------------------------------

             Summary:  Region splitting not happened for long time due to ZK exception while
creating RS_ZK_SPLITTING node
                 Key: HBASE-6088
                 URL: https://issues.apache.org/jira/browse/HBASE-6088
             Project: HBase
          Issue Type: Bug
    Affects Versions: 0.94.0
            Reporter: Gopinathan A
             Fix For: 0.94.1


Region splitting not happened for long time due to ZK exception while creating RS_ZK_SPLITTING
node

{noformat}
2012-05-24 01:45:41,363 INFO org.apache.zookeeper.ClientCnxn: Client session timed out, have
not heard from server in 26668ms for sessionid 0x1377a75f41d0012, closing socket connection
and attempting reconnect
2012-05-24 01:45:41,464 WARN org.apache.hadoop.hbase.zookeeper.RecoverableZooKeeper: Possibly
transient ZooKeeper exception: org.apache.zookeeper.KeeperException$ConnectionLossException:
KeeperErrorCode = ConnectionLoss for /hbase/unassigned/bd1079bf948c672e493432020dc0e144
{noformat}

{noformat}
2012-05-24 01:45:43,300 DEBUG org.apache.hadoop.hbase.regionserver.wal.HLog: cleanupCurrentWriter
 waiting for transactions to get synced  total 189377 synced till here 189365
2012-05-24 01:45:48,474 INFO org.apache.hadoop.hbase.regionserver.SplitRequest: Running rollback/cleanup
of failed split of ufdr,011365398471659,1337823505339.bd1079bf948c672e493432020dc0e144.; Failed
setting SPLITTING znode on ufdr,011365398471659,1337823505339.bd1079bf948c672e493432020dc0e144.
java.io.IOException: Failed setting SPLITTING znode on ufdr,011365398471659,1337823505339.bd1079bf948c672e493432020dc0e144.
	at org.apache.hadoop.hbase.regionserver.SplitTransaction.createDaughters(SplitTransaction.java:242)
	at org.apache.hadoop.hbase.regionserver.SplitTransaction.execute(SplitTransaction.java:450)
	at org.apache.hadoop.hbase.regionserver.SplitRequest.run(SplitRequest.java:67)
	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)
Caused by: org.apache.zookeeper.KeeperException$BadVersionException: KeeperErrorCode = BadVersion
for /hbase/unassigned/bd1079bf948c672e493432020dc0e144
	at org.apache.zookeeper.KeeperException.create(KeeperException.java:115)
	at org.apache.zookeeper.KeeperException.create(KeeperException.java:51)
	at org.apache.zookeeper.ZooKeeper.setData(ZooKeeper.java:1246)
	at org.apache.hadoop.hbase.zookeeper.RecoverableZooKeeper.setData(RecoverableZooKeeper.java:321)
	at org.apache.hadoop.hbase.zookeeper.ZKUtil.setData(ZKUtil.java:659)
	at org.apache.hadoop.hbase.zookeeper.ZKAssign.transitionNode(ZKAssign.java:811)
	at org.apache.hadoop.hbase.zookeeper.ZKAssign.transitionNode(ZKAssign.java:747)
	at org.apache.hadoop.hbase.regionserver.SplitTransaction.transitionNodeSplitting(SplitTransaction.java:919)
	at org.apache.hadoop.hbase.regionserver.SplitTransaction.createNodeSplitting(SplitTransaction.java:869)
	at org.apache.hadoop.hbase.regionserver.SplitTransaction.createDaughters(SplitTransaction.java:239)
	... 5 more
2012-05-24 01:45:48,476 INFO org.apache.hadoop.hbase.regionserver.SplitRequest: Successful
rollback of failed split of ufdr,011365398471659,1337823505339.bd1079bf948c672e493432020dc0e144.
{noformat}


{noformat}
2012-05-24 01:47:28,141 ERROR org.apache.hadoop.hbase.zookeeper.RecoverableZooKeeper: Node
/hbase/unassigned/bd1079bf948c672e493432020dc0e144 already exists and this is not a retry
2012-05-24 01:47:28,142 INFO org.apache.hadoop.hbase.regionserver.SplitRequest: Running rollback/cleanup
of failed split of ufdr,011365398471659,1337823505339.bd1079bf948c672e493432020dc0e144.; Failed
create of ephemeral /hbase/unassigned/bd1079bf948c672e493432020dc0e144
java.io.IOException: Failed create of ephemeral /hbase/unassigned/bd1079bf948c672e493432020dc0e144
	at org.apache.hadoop.hbase.regionserver.SplitTransaction.createNodeSplitting(SplitTransaction.java:865)
	at org.apache.hadoop.hbase.regionserver.SplitTransaction.createDaughters(SplitTransaction.java:239)
	at org.apache.hadoop.hbase.regionserver.SplitTransaction.execute(SplitTransaction.java:450)
	at org.apache.hadoop.hbase.regionserver.SplitRequest.run(SplitRequest.java:67)
{noformat}

Due to the above exception, region splitting was failing contineously more than 5hrs

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