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https://issues.apache.org/jira/browse/HADOOP-1242?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12495215
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Konstantin Shvachko commented on HADOOP-1242:
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You leave data-node directories in an _inconsistent_ state, namely there are
two repositories coexisting together.
This is going to create a confusion on whether the conversion really took place
and to what extent.
Another problem is that exactly the same thing can happen if conversion fails
after renaming the data directory
to current, but before moving the storage file into the current dir.
With you patch this failure will not be detected.
> 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: Owen O'Malley
> Priority: Blocker
> Fix For: 0.13.0
>
> Attachments: clean-upgrade.patch
>
>
> 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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