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From "Uma Maheswara Rao G (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3452) BKJM:Switch from standby to active fails and NN gets shut down due to delay in clearing of lock
Date Sat, 26 May 2012 06:43:23 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3452?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13283921#comment-13283921
] 

Uma Maheswara Rao G commented on HDFS-3452:
-------------------------------------------

{quote}1.The version in the data should be a format version, in case we wish to change the
data format in future. Not the znode version
{quote}
Oh, since you mentioned that this is for debugging i thought it is of Znode. Now i am using
format version number. I am assuming, this is the version number you are mentioning here.

{quote}2.the creation of the inprogress znode should catch a nodeexists exception in the case
to two nodes starting at once{quote}
done. good one. somehow, I missed it. :-)

{quote}3.in javadoc, @update should be #update{quote}
done.

{quote}4."Already inprogress node exists" -> "Inprogress node already exists"{quote}
done

{quote}5.TestBookKeeperJournalManager#testAllBookieFailure: you need to add bkjm.recoverUnfinalizedSegments()
before the failing startLogSegment.
6.TestBookKeeperAsHASharedDir#testMultiplePrimariesStarted: {quote}
done.

Thanks a lot, Ivan for your reviews. 
                
> BKJM:Switch from standby to active fails and NN gets shut down due to delay in clearing
of lock
> -----------------------------------------------------------------------------------------------
>
>                 Key: HDFS-3452
>                 URL: https://issues.apache.org/jira/browse/HDFS-3452
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: suja s
>            Assignee: Uma Maheswara Rao G
>            Priority: Blocker
>         Attachments: BK-253-BKJM.patch, HDFS-3452-1.patch, HDFS-3452.patch, HDFS-3452.patch
>
>
> Normal switch fails. 
> (BKjournalManager zk session timeout is 3000 and ZKFC session timeout is 5000. By the
time control comes to acquire lock the previous lock is not released which leads to failure
in lock acquisition by NN and NN gets shutdown. Ideally it should have been done)
> =============================================================================
> 2012-05-09 20:15:29,732 ERROR org.apache.hadoop.contrib.bkjournal.WriteLock: Failed to
acquire lock with /ledgers/lock/lock-0000000007, lock-0000000006 already has it
> 2012-05-09 20:15:29,732 FATAL org.apache.hadoop.hdfs.server.namenode.FSEditLog: Error:
recoverUnfinalizedSegments failed for required journal (JournalAndStream(mgr=org.apache.hadoop.contrib.bkjournal.BookKeeperJournalManager@412beeec,
stream=null))
> java.io.IOException: Could not acquire lock
> at org.apache.hadoop.contrib.bkjournal.WriteLock.acquire(WriteLock.java:107)
> at org.apache.hadoop.contrib.bkjournal.BookKeeperJournalManager.recoverUnfinalizedSegments(BookKeeperJournalManager.java:406)
> at org.apache.hadoop.hdfs.server.namenode.JournalSet$6.apply(JournalSet.java:551)
> at org.apache.hadoop.hdfs.server.namenode.JournalSet.mapJournalsAndReportErrors(JournalSet.java:322)
> at org.apache.hadoop.hdfs.server.namenode.JournalSet.recoverUnfinalizedSegments(JournalSet.java:548)
> at org.apache.hadoop.hdfs.server.namenode.FSEditLog.recoverUnclosedStreams(FSEditLog.java:1134)
> at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.startActiveServices(FSNamesystem.java:598)
> at org.apache.hadoop.hdfs.server.namenode.NameNode$NameNodeHAContext.startActiveServices(NameNode.java:1287)
> at org.apache.hadoop.hdfs.server.namenode.ha.ActiveState.enterState(ActiveState.java:61)
> at org.apache.hadoop.hdfs.server.namenode.ha.HAState.setStateInternal(HAState.java:63)
> at org.apache.hadoop.hdfs.server.namenode.ha.StandbyState.setState(StandbyState.java:49)
> at org.apache.hadoop.hdfs.server.namenode.NameNode.transitionToActive(NameNode.java:1219)
> at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.transitionToActive(NameNodeRpcServer.java:978)
> at org.apache.hadoop.ha.protocolPB.HAServiceProtocolServerSideTranslatorPB.transitionToActive(HAServiceProtocolServerSideTranslatorPB.java:107)
> at org.apache.hadoop.ha.proto.HAServiceProtocolProtos$HAServiceProtocolService$2.callBlockingMethod(HAServiceProtocolProtos.java:3633)
> at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:427)
> at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:916)
> at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1692)
> at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1688)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:396)
> at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1232)
> at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1686)
> 2012-05-09 20:15:29,736 INFO org.apache.hadoop.hdfs.server.namenode.NameNode: SHUTDOWN_MSG:

> /************************************************************
> SHUTDOWN_MSG: Shutting down NameNode at HOST-XX-XX-XX-XX/XX.XX.XX.XX
> Scenario:
> Start ZKFCS, NNs
> NN1 is active and NN2 is standby
> Stop NN1. NN2 tries to transition to active and gets shut down

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