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https://issues.apache.org/jira/browse/HDFS-3443?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14277967#comment-14277967
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Tsz Wo Nicholas Sze commented on HDFS-3443:
-------------------------------------------
> ... Remaining all requests will anyway will be rejected since the initial
> state will be STANDBY. ...
Some methods such as saveNamespace() and refreshNodes are
OperationCategory.UNCHECKED operations so that standby nn should serve them.
Some other methods such as blockReceivedAndDeleted(),
refreshUserToGroupsMappings() and addSpanReceiver() do not check
OperationCategory. Some of them probably are bugs.
> 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: Bug
> Components: auto-failover
> Reporter: suja s
> Assignee: amith
> Attachments: HDFS-3443-003.patch, HDFS-3443_1.patch, HDFS-3443_1.patch
>
>
> 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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