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https://issues.apache.org/jira/browse/HDFS-7714?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14314317#comment-14314317
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Hudson commented on HDFS-7714:
------------------------------
FAILURE: Integrated in Hadoop-Mapreduce-trunk #2051 (See
[https://builds.apache.org/job/Hadoop-Mapreduce-trunk/2051/])
HDFS-7714. Simultaneous restart of HA NameNodes and DataNode can cause DataNode
to register successfully with only one NameNode.(Contributed by Vinayakumar B)
(vinayakumarb: rev 3d15728ff5301296801e541d9b23bd1687c4adad)
* hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BPServiceActor.java
> Simultaneous restart of HA NameNodes and DataNode can cause DataNode to
> register successfully with only one NameNode.
> ---------------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-7714
> URL: https://issues.apache.org/jira/browse/HDFS-7714
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: datanode
> Affects Versions: 2.6.0
> Reporter: Chris Nauroth
> Assignee: Vinayakumar B
> Fix For: 2.7.0
>
> Attachments: HDFS-7714-001.patch, HDFS-7714-002.patch
>
>
> In an HA deployment, DataNodes must register with both NameNodes and send
> periodic heartbeats and block reports to both. However, if NameNodes and
> DataNodes are restarted simultaneously, then this can trigger a race
> condition in registration. The end result is that the {{BPServiceActor}} for
> one NameNode terminates, but the {{BPServiceActor}} for the other NameNode
> remains alive. The DataNode process is then in a "half-alive" state where it
> only heartbeats and sends block reports to one of the NameNodes. This could
> cause a loss of storage capacity after an HA failover. The DataNode process
> would have to be restarted to resolve this.
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