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https://issues.apache.org/jira/browse/HDFS-11209?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15826619#comment-15826619
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Arpit Agarwal commented on HDFS-11209:
--------------------------------------
+1 for the v04 patch assuming the test failures are unrelated.
One minor point - the isRollingUpgrade RPC need not check for super user
privilege since it's harmless. Doesn't affect correctness though since the SNN
would be running as the hdfs superuser.
> SNN can't checkpoint when rolling upgrade is not finalized
> ----------------------------------------------------------
>
> Key: HDFS-11209
> URL: https://issues.apache.org/jira/browse/HDFS-11209
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: rolling upgrades
> Affects Versions: 2.8.0, 3.0.0-alpha1
> Reporter: Xiaoyu Yao
> Assignee: Xiaoyu Yao
> Priority: Critical
> Attachments: HDFS-11209.00.patch, HDFS-11209.01.patch,
> HDFS-11209.02.patch, HDFS-11209.03.patch, HDFS-11209.04.patch
>
>
> Similar problem has been fixed with HDFS-7185. Recent change in HDFS-8432
> brings this back.
> With HDFS-8432, the primary NN will not update the VERSION file to the new
> version after running with "rollingUpgrade" option until upgrade is
> finalized. This is to support more downgrade use cases.
> However, the checkpoint on the SNN is incorrectly updating the VERSION file
> when the rollingUpgrade is not finalized yet on the primary NN. As a result,
> the SNN checkpoint successfully but fail to push it to the primary NN because
> its version is higher than the primary NN as shown below.
> {code}
> 2016-12-02 05:25:31,918 ERROR namenode.SecondaryNameNode
> (SecondaryNameNode.java:doWork(399)) - Exception in doCheckpoint
> org.apache.hadoop.hdfs.server.namenode.TransferFsImage$HttpPutFailedException:
> Image uploading failed, status: 403, url:
> http://NN:50070/imagetransfer?txid=345404754&imageFile=IMAGE&File-Le...,
> message: This namenode has storage info -60:221856466:1444080250181:clusterX
> but the secondary expected -63:221856466:1444080250181:clusterX
> {code}
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