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