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https://issues.apache.org/jira/browse/HADOOP-4476?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12641388#action_12641388
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Steve Loughran commented on HADOOP-4476:
----------------------------------------
stack trace
{code}
[sf-startdaemon-debug] java.lang.NullPointerException
[sf-startdaemon-debug] at
org.apache.hadoop.hdfs.server.datanode.DataNode.handshake(DataNode.java:443)
[sf-startdaemon-debug] at
org.apache.hadoop.hdfs.server.datanode.DataNode.startDataNode(DataNode.java:302)
{code}
The line at fault is
{code}
if( ! nsInfo.getBuildVersion().equals( Storage.getBuildVersion() ))
{code}
At a guess, the getBuildVersion() value is null, which implies the handshaking
failed; the datanode was still handshaking when shouldRun was set to false, it
stopped spinning trying to talk to the namenode, and instead of checking for
shouldRun==true and bailing out, it assumed the handshake information had been
correctly received.
> NPE in datanode.handshake()
> ---------------------------
>
> Key: HADOOP-4476
> URL: https://issues.apache.org/jira/browse/HADOOP-4476
> Project: Hadoop Core
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.20.0
> Reporter: Steve Loughran
> Priority: Minor
>
> It appears possible to raise an NPE in DataNode.handshake() if the startup
> protocol gets interrupted or fails in some manner
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