Sorry Harsh and thanks for the advice. I'm new to Hadoop and didn't thought of
reading the logs. But you're right:
2010-10-04 23:09:22,812 ERROR org.apache.hadoop.hdfs.server.datanode.DataNode:
java.io.IOException: Incompatible namespaceIDs in
/private/tmp/hadoop-Hadoop/dfs/data: namenode namespaceID = 200395975; datanode
namespaceID = 1970823831
at
org.apache.hadoop.hdfs.server.datanode.DataStorage.doTransition(DataStorage.java:233)
at
org.apache.hadoop.hdfs.server.datanode.DataStorage.recoverTransitionRead(DataStorage.java:148)
at
org.apache.hadoop.hdfs.server.datanode.DataNode.startDataNode(DataNode.java:298)
at
org.apache.hadoop.hdfs.server.datanode.DataNode.<init>(DataNode.java:216)
at
org.apache.hadoop.hdfs.server.datanode.DataNode.makeInstance(DataNode.java:1283)
at
org.apache.hadoop.hdfs.server.datanode.DataNode.instantiateDataNode(DataNode.java:1238)
at
org.apache.hadoop.hdfs.server.datanode.DataNode.createDataNode(DataNode.java:1246)
at
org.apache.hadoop.hdfs.server.datanode.DataNode.main(DataNode.java:1368)
But again what is incompatible here?
Maha
On Oct 4, 2010, at 11:08 PM, Harsh J wrote:
> The logs tell what the problem is precisely 99% of times. Formatting is not
> the only solution. How and when does your node go down? Give the list some
> more information to help you better :)
>
> On Oct 5, 2010 11:35 AM, "maha" <[email protected]> wrote:
>
> Hi Neil,
>
> Thanks for responding. Basically formatting removes all my files, is there
> away not to? I didn't thought about checking the log. Thanks,
>
> Maha
>
>
> On Oct 4, 2010, at 10:54 PM, Neil Ghosh wrote:
>
>> Maha,
>>
>> Is there any specific reason you don't...
