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https://issues.apache.org/jira/browse/HDFS-5291?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13787976#comment-13787976
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Vinay commented on HDFS-5291:
-----------------------------
bq. This is seen in our nightlies where we see other services being impacted by
namenode being in safemode. In our tests we are killing the active namenode
every 5 mins and some times we see that after the transition from standby to
active the namenode goes into safemode.
In this case since failovers are frequent NN entering into safemode is
possible. In this case safemode is entering to extention after reading the
complete edits during failover.
I think, title of the issue is confusing here. May be we can change to "Client
needs to retry on startup SafeModeException" ..?
But One more query, if NN stays in safemode forever due to some missing blocks,
then also client have to retry till all failovers are complete?
> Standby namenode after transition to active goes into safemode
> --------------------------------------------------------------
>
> Key: HDFS-5291
> URL: https://issues.apache.org/jira/browse/HDFS-5291
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: ha
> Affects Versions: 2.1.1-beta
> Reporter: Arpit Gupta
> Assignee: Jing Zhao
> Priority: Critical
> Attachments: HDFS-5291.000.patch, HDFS-5291.001.patch,
> HDFS-5291.002.patch, nn.log
>
>
> Some log snippets
> standby state to active transition
> {code}
> 2013-10-02 00:13:49,482 INFO ipc.Server (Server.java:run(2068)) - IPC Server
> handler 69 on 8020, call
> org.apache.hadoop.hdfs.protocol.ClientProtocol.renewLease from IP:33911
> Call#1483 Retry#1: error: org.apache.hadoop.ipc.StandbyException: Operation
> category WRITE is not supported in state standby
> 2013-10-02 00:13:49,689 INFO ipc.Server (Server.java:saslProcess(1342)) -
> Auth successful for nn/[email protected] (auth:SIMPLE)
> 2013-10-02 00:13:49,696 INFO authorize.ServiceAuthorizationManager
> (ServiceAuthorizationManager.java:authorize(111)) - Authorization successful
> for nn/[email protected] (auth:KERBEROS) for protocol=interface
> org.apache.hadoop.ha.HAServiceProtocol
> 2013-10-02 00:13:49,700 INFO namenode.FSNamesystem
> (FSNamesystem.java:stopStandbyServices(1013)) - Stopping services started for
> standby state
> 2013-10-02 00:13:49,701 WARN ha.EditLogTailer
> (EditLogTailer.java:doWork(336)) - Edit log tailer interrupted
> java.lang.InterruptedException: sleep interrupted
> at java.lang.Thread.sleep(Native Method)
> at
> org.apache.hadoop.hdfs.server.namenode.ha.EditLogTailer$EditLogTailerThread.doWork(EditLogTailer.java:334)
> at
> org.apache.hadoop.hdfs.server.namenode.ha.EditLogTailer$EditLogTailerThread.access$200(EditLogTailer.java:279)
> at
> org.apache.hadoop.hdfs.server.namenode.ha.EditLogTailer$EditLogTailerThread$1.run(EditLogTailer.java:296)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:356)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1463)
> at
> org.apache.hadoop.security.SecurityUtil.doAsLoginUserOrFatal(SecurityUtil.java:454)
> at org.apache.hadoop.hdfs.server.namenode.ha.EditLogTailer$EditLogTail
> 2013-10-02 00:13:49,704 INFO namenode.FSNamesystem
> (FSNamesystem.java:startActiveServices(885)) - Starting services required for
> active state
> 2013-10-02 00:13:49,719 INFO client.QuorumJournalManager
> (QuorumJournalManager.java:recoverUnfinalizedSegments(419)) - Starting
> recovery process for unclosed journal segments...
> 2013-10-02 00:13:49,755 INFO ipc.Server (Server.java:saslProcess(1342)) -
> Auth successful for hbase/[email protected] (auth:SIMPLE)
> 2013-10-02 00:13:49,761 INFO authorize.ServiceAuthorizationManager
> (ServiceAuthorizationManager.java:authorize(111)) - Authorization successful
> for hbase/[email protected] (auth:KERBEROS) for protocol=interface
> org.apache.hadoop.hdfs.protocol.ClientProtocol
> 2013-10-02 00:13:49,839 INFO client.QuorumJournalManager
> (QuorumJournalManager.java:recoverUnfinalizedSegments(421)) - Successfully
> started new epoch 85
> 2013-10-02 00:13:49,839 INFO client.QuorumJournalManager
> (QuorumJournalManager.java:recoverUnclosedSegment(249)) - Beginning recovery
> of unclosed segment starting at txid 887112
> 2013-10-02 00:13:49,874 INFO client.QuorumJournalManager
> (QuorumJournalManager.java:recoverUnclosedSegment(258)) - Recovery prepare
> phase complete. Responses:
> IP:8485: segmentState { startTxId: 887112 endTxId: 887531 isInProgress: true
> } lastWriterEpoch: 84 lastCommittedTxId: 887530
> 172.18.145.97:8485: segmentState { startTxId: 887112 endTxId: 887531
> isInProgress: true } lastWriterEpoch: 84 lastCommittedTxId: 887530
> 2013-10-02 00:13:49,875 INFO client.QuorumJournalManager
> (QuorumJournalManager.java:recover
> {code}
> And then we get into safemode
> {code}
> Construction[IP:1019|RBW]]} size 0
> 2013-10-02 00:13:50,277 INFO BlockStateChange
> (BlockManager.java:logAddStoredBlock(2237)) - BLOCK* addStoredBlock: blockMap
> updated: IP:1019 is added to blk_IP157{blockUCState=UNDER_CONSTRUCTION,
> primaryNodeIndex=-1, replicas=[ReplicaUnderConstruction[IP:1019|RBW],
> ReplicaUnderConstruction[172.18.145.96:1019|RBW], ReplicaUnde
> rConstruction[IP:1019|RBW]]} size 0
> 2013-10-02 00:13:50,279 INFO hdfs.StateChange
> (FSNamesystem.java:reportStatus(4703)) - STATE* Safe mode ON.
> The reported blocks 1071 needs additional 5 blocks to reach the threshold
> 1.0000 of total blocks 1075.
> Safe mode will be turned off automatically
> 2013-10-02 00:13:50,279 INFO BlockStateChange
> (BlockManager.java:logAddStoredBlock(2237)) - BLOCK* addStoredBlock: blockMap
> updated: IP:1019 is added to blk_IP158{blockUCState=UNDER_CONSTRUCTION,
> primaryNodeIndex=-1,
> replicas=[ReplicaUnderConstruction[172.18.145.99:1019|RBW],
> ReplicaUnderConstruction[172.18.145.97:1019|RBW],
> ReplicaUnderConstruction[IP:1019|RBW]]} size 0
> 2013-10-02 00:13:50,280 INFO BlockStateChange
> (BlockManager.java:logAddStoredBlock(2237)) - BLOCK* addStoredBlock: blockMap
> updated: 172.18.145.99:1019 is added to
> blk_IP158{blockUCState=UNDER_CONSTRUCTION, primaryNodeIndex=-1,
> replicas=[ReplicaUnderConstruction[172.18.145.99:1019|RBW],
> ReplicaUnderConstruction[172.18.145.97:1019|RBW],
> ReplicaUnderConstruction[IP:1019|RBW]]} size 0
> 2013-10-02 00:13:50,281 INFO BlockStateChange
> (BlockManager.java:logAddStoredBlock(2237)) - BLOCK* addStoredBlock: blockMap
> updated: 172.18.145.97:1019 is added to
> blk_IP158{blockUCState=UNDER_CONSTRUCTION, primaryNodeIndex=-1,
> replicas=[ReplicaUnderConstruction[172.18.145.99:1019|RBW],
> ReplicaUnderConstruction[172.18.145.97:1019|RBW],
> ReplicaUnderConstruction[IP:1019|RBW]]} size 0
> {code}
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