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https://issues.apache.org/jira/browse/HDFS-10767?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15423167#comment-15423167
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Sean Busbey commented on HDFS-10767:
------------------------------------
This was also posted to user@hbase, let's keep the discussion there. ([ref the
discussion
thread|https://lists.apache.org/thread.html/11e53ba87bf03db348bbaff9f24065fb262839417a3ec06944d6b92b@%3Cuser.hadoop.apache.org%3E])
> downgrade from 2.7.2 to 2.5.0
> -----------------------------
>
> Key: HDFS-10767
> URL: https://issues.apache.org/jira/browse/HDFS-10767
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 2.5.0
> Environment: hdfs 2.5.0 2.7.2
> Reporter: jin xing
>
> I have already upgrade my cluster’s namenodes(with one stand by for HA) and
> several datanodes from 2.5.0 folloing
> https://hadoop.apache.org/docs/r2.7.2/hadoop-project-dist/hadoop-hdfs/HdfsRollingUpgrade.html#Downgrade_and_Rollback;
>
> I take following steps:
> 1. hdfs dfsadmin -rollingUpgrade prepare;
> 2. hdfs dfsadmin -rollingUpgrade query;
> 3. hdfs dfsadmin -shutdownDatanode <host:port> upgrade
> 4. restart and upgrade datanode;
> However, I terminated the upgrade by mistake with command "hfs dfsadmin
> -rollingUpgrade finalize"
> Currently, I have two 2.7.2 nematodes, and three 2.7.2 datanodes and 63 2.5.0
> datanodes; Now I want to downgrade the nematodes and datanodes from 2.7.2
> back to 2.5.0;
> But when I try to downgrade nematode and restart with “-rollingUpgrade
> downgrade”, namenode cannot get started, I get rolling exception:
> 2016-08-16 20:37:08,642 WARN
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Encountered exception
> loading fsimage
> org.apache.hadoop.hdfs.server.common.IncorrectVersionException: Unexpected
> version of storage directory /home/maintain/hadoop/data/hdfs-namenode.
> Reported: -63. Expecting = -57.
> 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:323)
> at
> org.apache.hadoop.hdfs.server.namenode.FSImage.recoverTransitionRead(FSImage.java:202)
> at
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.loadFSImage(FSNamesystem.java:955)
> at
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.loadFromDisk(FSNamesystem.java:700)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.loadNamesystem(NameNode.java:529)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:585)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:751)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:735)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1407)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1473)
> 2016-08-16 20:37:08,645 INFO org.mortbay.log: Stopped
> HttpServer2$SelectChannelConnectorWithSafeStartup@dx-pipe-sata61-pm:50070
> 2016-08-16 20:37:08,745 INFO
> org.apache.hadoop.metrics2.impl.MetricsSystemImpl: Stopping NameNode metrics
> system...
> 2016-08-16 20:37:08,746 INFO
> org.apache.hadoop.metrics2.impl.MetricsSystemImpl: NameNode metrics system
> stopped.
> 2016-08-16 20:37:08,746 INFO
> org.apache.hadoop.metrics2.impl.MetricsSystemImpl: NameNode metrics system
> shutdown complete.
> 2016-08-16 20:37:08,746 FATAL
> org.apache.hadoop.hdfs.server.namenode.NameNode: Exception in namenode join
> org.apache.hadoop.hdfs.server.common.IncorrectVersionException: Unexpected
> version of storage directory /home/maintain/hadoop/data/hdfs-namenode.
> Reported: -63. Expecting = -57.
> 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:323)
> at
> org.apache.hadoop.hdfs.server.namenode.FSImage.recoverTransitionRead(FSImage.java:202)
> at
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.loadFSImage(FSNamesystem.java:955)
> at
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.loadFromDisk(FSNamesystem.java:700)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.loadNamesystem(NameNode.java:529)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:585)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:751)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:735)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1407)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1473)
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