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From "Harpreet Kaur (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-9096) Issue in Rollback (after rolling upgrade) from hadoop 2.7.1 to 2.4.0
Date Thu, 17 Sep 2015 04:22:45 GMT
Harpreet Kaur created HDFS-9096:

             Summary: 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>"

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@

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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