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https://issues.apache.org/jira/browse/HDFS-3443?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13278734#comment-13278734
]
Uma Maheswara Rao G commented on HDFS-3443:
-------------------------------------------
I think, StandBy node not initialized completely and ZKFC gave the call for
transitioning to active. At this point We have the FSNameSystem write lock only
for starting activeServices. So, parallelly starting activeServices also can go
ahead. By this time, editLogTailer might not have been initialized sompletely.
Hence thrwing NPE.
I think we should block the active initialization until it completes standby
initialization. should have lock here?
or since there wont be any FSNameSystem updations for standby locking may not
be require here. So, just having null check should be fine?
> Unable to catch up edits during standby to active switch due to NPE
> -------------------------------------------------------------------
>
> Key: HDFS-3443
> URL: https://issues.apache.org/jira/browse/HDFS-3443
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: auto-failover
> Reporter: suja s
> Assignee: Uma Maheswara Rao G
>
> Start NN
> Let NN standby services be started.
> Before the editLogTailer is initialised start ZKFC and allow the
> activeservices start to proceed further.
> Here editLogTailer.catchupDuringFailover() will throw NPE.
> void startActiveServices() throws IOException {
> LOG.info("Starting services required for active state");
> writeLock();
> try {
> FSEditLog editLog = dir.fsImage.getEditLog();
>
> if (!editLog.isOpenForWrite()) {
> // During startup, we're already open for write during initialization.
> editLog.initJournalsForWrite();
> // May need to recover
> editLog.recoverUnclosedStreams();
>
> LOG.info("Catching up to latest edits from old active before " +
> "taking over writer role in edits logs.");
> editLogTailer.catchupDuringFailover();
> {noformat}
> 2012-05-18 16:51:27,585 WARN org.apache.hadoop.ipc.Server: IPC Server
> Responder, call org.apache.hadoop.ha.HAServiceProtocol.getServiceStatus from
> XX.XX.XX.55:58003: output error
> 2012-05-18 16:51:27,586 WARN org.apache.hadoop.ipc.Server: IPC Server handler
> 8 on 8020, call org.apache.hadoop.ha.HAServiceProtocol.transitionToActive
> from XX.XX.XX.55:58004: error: java.lang.NullPointerException
> java.lang.NullPointerException
> at
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.startActiveServices(FSNamesystem.java:602)
> 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)
> 2012-05-18 16:51:27,586 INFO org.apache.hadoop.ipc.Server: IPC Server handler
> 9 on 8020 caught an exception
> java.nio.channels.ClosedChannelException
> at
> sun.nio.ch.SocketChannelImpl.ensureWriteOpen(SocketChannelImpl.java:133)
> at sun.nio.ch.SocketChannelImpl.write(SocketChannelImpl.java:324)
> at org.apache.hadoop.ipc.Server.channelWrite(Server.java:2092)
> at org.apache.hadoop.ipc.Server.access$2000(Server.java:107)
> at
> org.apache.hadoop.ipc.Server$Responder.processResponse(Server.java:930)
> at org.apache.hadoop.ipc.Server$Responder.doRespond(Server.java:994)
> at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1738)
> {noformat}
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