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https://issues.apache.org/jira/browse/HDFS-7053?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14136871#comment-14136871
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sam liu commented on HDFS-7053:
-------------------------------
Hi Jing,
Thanks for your comments! However, I still failed to rollback hadoop version on
a non HA cluster. I doubt this is a bug or did I miss any step? Below are my
steps:
[A] Upgrade
1. Install Hadoop 2.2.0 cluster
2. Stop Hadoop services
3. Replace 2.2.0 binaries with 2.4.1 binaries
4. Start datanodes: $HADOOP_HOME/sbin/hadoop-daemon.sh start datanode
5. Start namenode with option upgrade: $HADOOP_HOME/sbin/hadoop-daemon.sh start
namenode -upgrade
6. Start secondary namenode, tasktracker and jobtracker
Result:
- Whole upgrade process could be completed successfully.
[B] Rollback
1. Stop all hadoop services
2. Replace 2.4.1 binaries with 2.2.0 binaries
3. Start datanodes: $HADOOP_HOME/sbin/hadoop-daemon.sh start datanode
4. Start namenode with option upgrade: $HADOOP_HOME/sbin/hadoop-daemon.sh start
namenode -rollback
Result:
- Namenode service could be started
- Datanodes failed with exception:
Issue: DataNode failed with following exception
2014-09-17 11:04:51,416 INFO org.apache.hadoop.hdfs.server.common.Storage: Lock
on /hadoop/hdfs/data/in_use.lock acquired by nodename 817443@shihc071-public
2014-09-17 11:04:51,418 FATAL org.apache.hadoop.hdfs.server.datanode.DataNode:
Initialization failed for block pool Block pool
BP-977402492-9.181.64.185-1410497086460 (storage id ) service to
hostname/ip:9000
org.apache.hadoop.hdfs.server.common.IncorrectVersionException: Unexpected
version of storage directory /hadoop/hdfs/data. Reported: -55. Expecting = -47.
at
org.apache.hadoop.hdfs.server.common.Storage.setLayoutVersion(Storage.java:1082)
at
org.apache.hadoop.hdfs.server.datanode.DataStorage.setFieldsFromProperties(DataStorage.java:302)
at
org.apache.hadoop.hdfs.server.common.Storage.readProperties(Storage.java:921)
Thanks!
> Failed to rollback hdfs version from 2.4.1 to 2.2.0
> ---------------------------------------------------
>
> Key: HDFS-7053
> URL: https://issues.apache.org/jira/browse/HDFS-7053
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: ha, namenode
> Affects Versions: 2.4.1
> Reporter: sam liu
> Priority: Blocker
>
> I can successfully upgrade from 2.2.0 to 2.4.1 with QJM HA enabled and with
> downtime, but failed to rollback from 2.4.1 to 2.2.0. The error message:
> 2014-09-10 16:50:29,599 FATAL
> org.apache.hadoop.hdfs.server.namenode.NameNode: Exception in namenode join
> org.apache.hadoop.HadoopIllegalArgumentException: Invalid startup option.
> Cannot perform DFS upgrade with HA enabled.
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1207)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1320)
> 2014-09-10 16:50:29,601 INFO org.apache.hadoop.util.ExitUtil: Exiting with
> status 1
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