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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4201) NPE in BPServiceActor#sendHeartBeat
Date Mon, 09 Dec 2013 19:00:09 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4201?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13843410#comment-13843410
] 

Colin Patrick McCabe commented on HDFS-4201:
--------------------------------------------

wouldn't it be easier to use a try+finally here to set bpNSInfo back to null if initBlockPool
fails?  That way, the code could call the normal methods like getNamespaceInfo.  This may
make it easier to merge this change with any other changes to the initialization path that
are coming up.

> NPE in BPServiceActor#sendHeartBeat
> -----------------------------------
>
>                 Key: HDFS-4201
>                 URL: https://issues.apache.org/jira/browse/HDFS-4201
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>            Reporter: Eli Collins
>            Assignee: Jimmy Xiang
>            Priority: Critical
>             Fix For: 3.0.0
>
>         Attachments: trunk-4201.patch, trunk-4201_v2.patch
>
>
> Saw the following NPE in a log.
> Think this is likely due to {{dn}} or {{dn.getFSDataset()}} being null, (not {{bpRegistration}})
due to a configuration or local directory failure.
> {code}
> 2012-09-25 04:33:20,782 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: For namenode
svsrs00127/11.164.162.226:8020 using DELETEREPORT_INTERVAL of 300000 msec  BLOCKREPORT_INTERVAL
of 21600000msec Initial delay: 0msec; heartBeatInterval=3000
> 2012-09-25 04:33:20,782 ERROR org.apache.hadoop.hdfs.server.datanode.DataNode: Exception
in BPOfferService for Block pool BP-1678908700-11.164.162.226-1342785481826 (storage id DS-1031100678-11.164.162.251-5010-1341933415989)
service to svsrs00127/11.164.162.226:8020
> java.lang.NullPointerException
>         at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.sendHeartBeat(BPServiceActor.java:434)
>         at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.offerService(BPServiceActor.java:520)
>         at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.run(BPServiceActor.java:673)
>         at java.lang.Thread.run(Thread.java:722)
> {code}



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