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https://issues.apache.org/jira/browse/HADOOP-1492?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12506038
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Hadoop QA commented on HADOOP-1492:
-----------------------------------
Integrated in Hadoop-Nightly #127 (See
[http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Nightly/127/])
> DataNode version mismatch during handshake() causes NullPointerException.
> -------------------------------------------------------------------------
>
> Key: HADOOP-1492
> URL: https://issues.apache.org/jira/browse/HADOOP-1492
> Project: Hadoop
> Issue Type: Bug
> Affects Versions: 0.13.0
> Reporter: Konstantin Shvachko
> Assignee: Konstantin Shvachko
> Fix For: 0.14.0
>
> Attachments: NullRegistration.patch
>
>
> If during handshake() DataNode encounters version mismatch with the name-node
> it sends errorReport()
> to the name-node with dnRegistration = null. This causes a
> NullPointerException on the name-node.
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