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Re: Incompartible cluserIDS
Thank you the HDFS system seems to be up. Now I am having a problem with getting the JobTracker and TaskTracker up. According to the logs on the JobTracker mapred doesn't have  write permission to /. I am not clear on what the permissions should be.

Anyway, thank you.

On Apr 29, 2013, at 4:30 PM, Mohammad Tariq <[EMAIL PROTECTED]> wrote:

> Hello Kevin,
>           Have you reformatted the NN(unsuccessfully)?Was your NN serving some other cluster earlier or your DNs were part of some other cluster?Datanodes bind themselves to namenode through namespaceID and in your case the IDs of DNs and NN seem to be different. As a workaround you could do this :
> 1- Stop all the daemons.
> 2- Go to the directory which you have specified as the value of "dfs.name.dir" property in your hdfs-site.xml file.
> 3- You'll find a directory called "current" inside this directory where a file named "VERSION" will be present. Open this file and copy the value of "namespaceID" form here.
> 4- Now go to the directory which you have specified as the value of "dfs.data.dir" property in your hdfs-site.xml file.
> 5- Move inside the "current" directory and open the "VERSION" file here as well. Now replace the value of "namespaceID" present here with the one you had copied earlier.
> 6- Restart all the daemons.
> Note : If you have not created dfs.name.dir and dfs.data.dir separately, you could find all this inside your temp directory.
> Warm Regards,
> Tariq
> https://mtariq.jux.com/
> cloudfront.blogspot.com
> On Tue, Apr 30, 2013 at 2:45 AM, <[EMAIL PROTECTED]> wrote:
>> I am trying to start up a cluster and in the datanode log on the NameNode server I get the error:
>> 2013-04-29 15:50:20,988 INFO org.apache.hadoop.hdfs.server.common.Storage: Lock on /data/hadoop/dfs/data/in_use.lock acquired by nodename 1406@devUbuntu05
>> 2013-04-29 15:50:20,990 FATAL org.apache.hadoop.hdfs.server.datanode.DataNode: Initialization failed for block pool Block pool BP-1306349046- (storage id DS-403514403- service to devUbuntu05/
>> java.io.IOException: Incompatible clusterIDs in /data/hadoop/dfs/data: namenode clusterID = CID-23b9f9c7-2c25-411f-8bd2-4d5c9d7c25a1; datanode clusterID = CID-e3f6b811-c1b4-4778-a31e-14dea8b2cca8
>>         at org.apache.hadoop.hdfs.server.datanode.DataStorage.doTransition(DataStorage.java:391)
>>         at org.apache.hadoop.hdfs.server.datanode.DataStorage.recoverTransitionRead(DataStorage.java:191)
>>         at org.apache.hadoop.hdfs.server.datanode.DataStorage.recoverTransitionRead(DataStorage.java:219)
>> How do I get around this error? What does the error mean?
>> Thank you.
>> Kevin