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>"
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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