Andras Bokor resolved HADOOP-5342.
    Resolution: Cannot Reproduce

Last reported occurrence was in 2010 so closing as Cannot Reproduce. Please 
reopen if you still experience this.

> DataNodes do not start up because InconsistentFSStateException on just part 
> of the disks in use
> -----------------------------------------------------------------------------------------------
>                 Key: HADOOP-5342
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5342
>             Project: Hadoop Common
>          Issue Type: Bug
>    Affects Versions: 0.18.2
>            Reporter: Christian Kunz
>            Assignee: Hairong Kuang
>            Priority: Critical
> After restarting a cluster (including rebooting) the dfs got corrupted 
> because many DataNodes did not start up, running into the following exception:
> 2009-02-26 22:33:53,774 ERROR org.apache.hadoop.dfs.DataNode: 
> org.apache.hadoop.dfs.InconsistentFSStateException: Directory xxx  is in an 
> inconsistent state: version file in current directory is missing.
>       at 
> org.apache.hadoop.dfs.Storage$StorageDirectory.analyzeStorage(Storage.java:326)
>       at 
> org.apache.hadoop.dfs.DataStorage.recoverTransitionRead(DataStorage.java:105)
>       at org.apache.hadoop.dfs.DataNode.startDataNode(DataNode.java:306)
>       at org.apache.hadoop.dfs.DataNode.<init>(DataNode.java:223)
>       at org.apache.hadoop.dfs.DataNode.makeInstance(DataNode.java:3030)
>       at 
> org.apache.hadoop.dfs.DataNode.instantiateDataNode(DataNode.java:2985)
>       at org.apache.hadoop.dfs.DataNode.createDataNode(DataNode.java:2993)
>       at org.apache.hadoop.dfs.DataNode.main(DataNode.java:3115)
> This happens when using multiple disks with at least one previously marked as 
> read-only, such that the storage version became out-dated, but after reboot 
> it was mounted read-write, resulting in the DataNode not starting because of 
> out-dated version.
> This is a big headache. If a DataNode has multiple disks of which at least 
> one has the correct storage version then out-dated versions should not bring 
> down the DataNode.

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