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From "Bikas Saha (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2905) Standby NN NPE when shared edits dir is deleted
Date Mon, 06 Feb 2012 22:52:59 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2905?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13201737#comment-13201737
] 

Bikas Saha commented on HDFS-2905:
----------------------------------

Start 2 NN's with a shared edits dir. Make one active. Let some edits roll. Now delete the
shared edits directory (simulating a shared edits failure). Standby NN NPE's with the following


12/02/06 14:41:27 WARN namenode.FSNamesystem: NameNode low on available disk space. Already
in safe mode.
12/02/06 14:48:00 INFO hdfs.StateChange: STATE* Safe mode is ON. Resources are low on NN.
Safe mode must be turned off manually.
12/02/06 14:48:05 WARN namenode.NameNodeResourceChecker: Space available on volume '/dev/disk0s2'
is 0, which is below the configured reserved amount 104857600
12/02/06 14:48:05 WARN namenode.FSNamesystem: NameNode low on available disk space. Already
in safe mode.
12/02/06 14:48:05 INFO hdfs.StateChange: STATE* Safe mode is ON. Resources are low on NN.
Safe mode must be turned off manually.
12/02/06 14:48:09 ERROR ha.EditLogTailer: Unknown error encountered while tailing edits. Shutting
down standby NN.
java.lang.NullPointerException
	at org.apache.hadoop.hdfs.server.namenode.FileJournalManager.matchEditLogs(FileJournalManager.java:160)
	at org.apache.hadoop.hdfs.server.namenode.FileJournalManager.getLogFiles(FileJournalManager.java:321)
	at org.apache.hadoop.hdfs.server.namenode.FileJournalManager.getNumberOfTransactions(FileJournalManager.java:228)
	at org.apache.hadoop.hdfs.server.namenode.JournalSet.getInputStream(JournalSet.java:216)
	at org.apache.hadoop.hdfs.server.namenode.FSEditLog.selectInputStreams(FSEditLog.java:1074)
	at org.apache.hadoop.hdfs.server.namenode.ha.EditLogTailer.doTailEdits(EditLogTailer.java:204)
	at org.apache.hadoop.hdfs.server.namenode.ha.EditLogTailer.access$600(EditLogTailer.java:57)
	at org.apache.hadoop.hdfs.server.namenode.ha.EditLogTailer$EditLogTailerThread.run(EditLogTailer.java:298)
12/02/06 14:48:09 INFO namenode.NameNode: SHUTDOWN_MSG: 
/************************************************************

                
> Standby NN NPE when shared edits dir is deleted
> -----------------------------------------------
>
>                 Key: HDFS-2905
>                 URL: https://issues.apache.org/jira/browse/HDFS-2905
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ha, name-node
>    Affects Versions: HA branch (HDFS-1623)
>            Reporter: Bikas Saha
>            Assignee: Bikas Saha
>


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