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From Dinesh Kumar Prabakaran <dineshpv...@gmail.com>
Subject Fwd: Issue in Rollback (after rolling upgrade) from hadoop 2.7.2 to 2.5.2
Date Thu, 13 Oct 2016 06:01:25 GMT
Hi Guys,

Did rolling upgrade from hadoop 2.5.2 to hadoop 2.7.2 and *did not finalize*
the upgrade. Now I wished to rollback to 2.5.2 version based on reference
<http://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-hdfs/HdfsRollingUpgrade.html#Rollback>
.

Starting Name node 1 as active with *-rollingUpgrade rollback*, it gets
shuts down with the following exception,

*org.apache.hadoop.hdfs.server.common.IncorrectVersionException: Unexpected
version of storage directory ..\Metadata\data\dfs\namenode. Reported: -63.
Expecting = -57.*

There is already a task regarding this but the status is *Open*.
https://issues.apache.org/jira/browse/HDFS-9096

Please let me know are there any *work around *to rollback HDFS from
rolling upgrade without any issues.

Thanks,
Dinesh Kumar P

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