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From maha <m...@umail.ucsb.edu>
Subject Fwd: Easy Question
Date Tue, 05 Oct 2010 06:33:48 GMT

> Sorry Harsh and thanks for the advice. I'm new to Hadoop and didn't thought of reading
the logs. But you're right. Now, the DATANODE is not starting:
> 
> 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? I think it's because I added dfs.data.dir to be
/user/Hadoop/hdfs/data and dfs.name.dir to be user/Hadoop/hdfs/name into the core-site.xml.
> 
>    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" <maha@umail.ucsb.edu> 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...
> 


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