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https://issues.apache.org/jira/browse/HDFS-9096?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15585675#comment-15585675
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Vinayakumar B commented on HDFS-9096:
-------------------------------------

I think this was fixed automatically by HDFS-7185. which is present in 2.6.0

After the rollingUpgrade to version with layoutVersion change, upgraded VERSION 
file will contain new version.
Without HDFS-7185, setting of layout version will fail as VERSION file contains 
new layout version.

After HDFS-7185, while loading the rollback image, "layoutVersion" will be 
ignored from VERSION file and set same as Software's VERSION, but it will be 
checked strictly from image file.

> Issue in Rollback (after rolling upgrade) from hadoop 2.7.1 to 2.4.0
> --------------------------------------------------------------------
>
>                 Key: HDFS-9096
>                 URL: https://issues.apache.org/jira/browse/HDFS-9096
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: rolling upgrades
>    Affects Versions: 2.4.0
>            Reporter: Harpreet Kaur
>
> I tried to do rolling upgrade from hadoop 2.4.0 to hadoop 2.7.1. As per 
> http://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-hdfs/HdfsRollingUpgrade.html#dfsadmin_-rollingUpgrade
>  one can rollback to previous release provided the finalise step is not done. 
> I upgraded the setup but didnot finalise the upgrade and tried to rollback 
> HDFS to 2.4.0
> I tried the following steps
>   1.  Shutdown all NNs and DNs.
>   2.  Restore the pre-upgrade release in all machines.
>   3.  Start NN1 as Active with the "-rollingUpgrade 
> rollback<http://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-hdfs/HdfsRollingUpgrade.html#namenode_-rollingUpgrade>"
>  option.
> I am getting the following error after 3rd step
> 15/09/01 17:53:35 INFO namenode.AclConfigFlag: ACLs enabled? false
> 15/09/01 17:53:35 INFO common.Storage: Lock on <<NameNode dir>>/in_use.lock 
> acquired by nodename 12152@VM-2
> 15/09/01 17:53:35 WARN namenode.FSNamesystem: Encountered exception loading 
> fsimage
> org.apache.hadoop.hdfs.server.common.IncorrectVersionException: Unexpected 
> version of storage directory /data/yarn/namenode. Reported: -63. Expecting = 
> -56.
> at 
> org.apache.hadoop.hdfs.server.common.StorageInfo.setLayoutVersion(StorageInfo.java:178)
> at 
> org.apache.hadoop.hdfs.server.common.StorageInfo.setFieldsFromProperties(StorageInfo.java:131)
> at 
> org.apache.hadoop.hdfs.server.namenode.NNStorage.setFieldsFromProperties(NNStorage.java:608)
> at 
> org.apache.hadoop.hdfs.server.common.StorageInfo.readProperties(StorageInfo.java:228)
> at 
> org.apache.hadoop.hdfs.server.namenode.FSImage.recoverStorageDirs(FSImage.java:309)
> at 
> org.apache.hadoop.hdfs.server.namenode.FSImage.recoverTransitionRead(FSImage.java:202)
> at 
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.loadFSImage(FSNamesystem.java:882)
> at 
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.loadFromDisk(FSNamesystem.java:639)
> at 
> org.apache.hadoop.hdfs.server.namenode.NameNode.loadNamesystem(NameNode.java:455)
> at 
> org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:511)
> at org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:670)
> at org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:655)
> at 
> org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1304)
> at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1370)
> 15/09/01 17:53:35 INFO mortbay.log: Stopped 
> SelectChannelConnector@0.0.0.0:50070
> 15/09/01 17:53:35 INFO impl.MetricsSystemImpl: Stopping NameNode metrics 
> system...
> 15/09/01 17:53:35 INFO impl.MetricsSystemImpl: NameNode metrics system 
> stopped.
> 15/09/01 17:53:35 INFO impl.MetricsSystemImpl: NameNode metrics system 
> shutdown complete.
> 15/09/01 17:53:35 FATAL namenode.NameNode: Exception in namenode join
> From rolling upgrade documentation it can be inferred that rolling upgrade is 
> supported Hadoop 2.4.0 onwards but rollingUpgrade rollback to Hadoop 2.4.0 
> seems to be broken in Hadoop 2.4.0. It throws above mentioned error.
> Are there any other steps to perform rollback (from rolling upgrade) or is it 
> not supported to rollback to Hadoop 2.4.0.



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