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https://issues.apache.org/jira/browse/HADOOP-1242?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12499282
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Raghu Angadi commented on HADOOP-1242:
--------------------------------------
+1 for the code. Couple of notes:
# Latest patch requires a "image" directory and "image/fsimage" at the name
node.
# The new files are not really "CORRUPT", they are in a specific format
understood only by post Hadoop-12. Random data in those files will cause 13 to
fail.
> 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: Konstantin Shvachko
> Priority: Blocker
> Fix For: 0.13.0
>
> Attachments: clean-upgrade.patch, failPreUpgradeVersion.patch,
> failPreUpgradeVersion2.patch, failPreUpgradeVersion3.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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