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Kihwal Lee commented on HDFS-9096: ---------------------------------- If it is indeed the VERSION file issue, you can workaround it by manually editing the VERSION file to put the old layout version, after making backups, of course. > 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. -- This message was sent by Atlassian JIRA (v6.3.4#6332) --------------------------------------------------------------------- To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org