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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-1242) dfs upgrade/downgrade problems
Date Wed, 09 May 2007 16:51:15 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1242?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12494524
] 

dhruba borthakur commented on HADOOP-1242:
------------------------------------------

>From my discussion with Konstantin, i understand that there is a manual sequence of steps
to recover from this scenario. Would appreciate it if somebody can describe (in this issue
commentary) what these manual steps are.

> dfs upgrade/downgrade problems
> ------------------------------
>
>                 Key: HADOOP-1242
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1242
>             Project: Hadoop
>          Issue Type: Bug
>          Components: dfs
>    Affects Versions: 0.13.0
>            Reporter: Owen O'Malley
>         Assigned To: dhruba borthakur
>            Priority: Blocker
>             Fix For: 0.13.0
>
>
> I ran my test cluster on 0.13 and then tried to run it under 0.12. When I downgraded,
the namenode would not come up and the message said I needed to format the filesystem. I ignored
that and tried to restart on 0.13, now the datanode will not come up with:
> 2007-04-10 11:25:37,448 ERROR org.apache.hadoop.dfs.DataNode: org.apache.hadoop.
> dfs.InconsistentFSStateException: Directory /local/owen/hadoop/dfs/d
> ata is in an inconsistent state: Old layout block directory /local/owen/hadoop/dfs/data/data
is missing
>         at org.apache.hadoop.dfs.DataStorage.isConversionNeeded(DataStorage.java
> :170)
>         at org.apache.hadoop.dfs.Storage$StorageDirectory.analyzeStorage(Storage
> .java:264)
>         at org.apache.hadoop.dfs.DataStorage.recoverTransitionRead(DataStorage.j
> ava:83)
>         at org.apache.hadoop.dfs.DataNode.startDataNode(DataNode.java:230)
>         at org.apache.hadoop.dfs.DataNode.<init>(DataNode.java:199)
>         at org.apache.hadoop.dfs.DataNode.makeInstance(DataNode.java:1175)
>         at org.apache.hadoop.dfs.DataNode.run(DataNode.java:1119)
>         at org.apache.hadoop.dfs.DataNode.createDataNode(DataNode.java:1140)
>         at org.apache.hadoop.dfs.DataNode.main(DataNode.java:1299)

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