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From Susheel Kumar Gadalay <skgada...@gmail.com>
Subject Re: Failed to rollback from hadoop-2.4.1 to hadoop 2.2.0
Date Thu, 18 Sep 2014 08:51:06 GMT
You have to upgrade both name node and data node.

Better issue start-dfs.sh -upgrade.

Check whether current and previous directories are present in both
dfs.namenode.name.dir and dfs.datanode.data.dir directory.

On 9/18/14, sam liu <samliuhadoop@gmail.com> wrote:
> Hi Expert,
>
> Below are my steps and is it a hadoop bug or did I miss any thing? Thanks!
>
> Step:
> [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)
>

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