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https://issues.apache.org/jira/browse/HDFS-7714?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14313462#comment-14313462
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Hadoop QA commented on HDFS-7714:
---------------------------------
{color:red}-1 overall{color}. Here are the results of testing the latest
attachment
http://issues.apache.org/jira/secure/attachment/12697397/HDFS-7714-002.patch
against trunk revision af08425.
{color:green}+1 @author{color}. The patch does not contain any @author
tags.
{color:red}-1 tests included{color}. The patch doesn't appear to include
any new or modified tests.
Please justify why no new tests are needed for this
patch.
Also please list what manual steps were performed to
verify this patch.
{color:green}+1 javac{color}. The applied patch does not increase the
total number of javac compiler warnings.
{color:green}+1 javadoc{color}. There were no new javadoc warning messages.
{color:green}+1 eclipse:eclipse{color}. The patch built with
eclipse:eclipse.
{color:red}-1 findbugs{color}. The patch appears to introduce 1 new
Findbugs (version 2.0.3) warnings.
{color:green}+1 release audit{color}. The applied patch does not increase
the total number of release audit warnings.
{color:green}+1 core tests{color}. The patch passed unit tests in
hadoop-hdfs-project/hadoop-hdfs.
Test results:
https://builds.apache.org/job/PreCommit-HDFS-Build/9504//testReport/
Findbugs warnings:
https://builds.apache.org/job/PreCommit-HDFS-Build/9504//artifact/patchprocess/newPatchFindbugsWarningshadoop-hdfs.html
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/9504//console
This message is automatically generated.
> 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
> 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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