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From Sandeep Reddy P <sandeepreddy.3...@gmail.com>
Subject Re: Data node error
Date Wed, 08 Aug 2012 14:02:49 GMT
Hi,
Just edit the namespace id in datanode. In your case it'll be in the
dfs.data.dir
vi /app/hadoop/tmp/dfs/data/current/VERSION
Replace namespace id 474761520(datanode namespace id) with 1434906924
(namenode name space id)

On Wed, Aug 8, 2012 at 4:15 AM, Chandra Mohan, Ananda Vel Murugan <
Ananda.Murugan@honeywell.com> wrote:

>  For incompatible namespaceid error, there are two solutions available
> here. ****
>
> ** **
>
>
> http://www.michael-noll.com/tutorials/running-hadoop-on-ubuntu-linux-multi-node-cluster/
> ****
>
> ** **
>
> I ran into this same issue and second solution fixed it. ****
>
> ** **
>
> ** **
>  ------------------------------
>
> *From:* anil gupta [mailto:anilgupta84@gmail.com]
> *Sent:* Wednesday, August 08, 2012 1:36 PM
> *To:* user@hadoop.apache.org
> *Subject:* Re: Data node error****
>
> ** **
>
> This link might provide you some more information:
> http://mail-archives.apache.org/mod_mbox/hadoop-common-user/201203.mbox/%3CCAAu13zHcMeUThvA9OPN9MeMyvE9SHxsD1gSdZnZOWs3qrQZaNQ@mail.gmail.com%3E
>
> HTH,
> Anil****
>
> On Wed, Aug 8, 2012 at 12:56 AM, anil gupta <anilgupta84@gmail.com> wrote:
> ****
>
> Hi Prabhu,
>
> Did you clean the data dir on DataNodes? Whenever Namenode is formated the
> data directories of Datanodes needs to be cleaned up. As far as i remember
> it's the directory which you mention in dfs.data.dir in hdfs-site.xml
> file.You can do a google search for the error and you can get more details.
> (Sorry, i dont have access to my cluster conf right now for telling you
> the exact property).
>
> Thanks,
> Anil****
>
> ** **
>
> On Wed, Aug 8, 2012 at 12:49 AM, prabhu K <prabhu.hadoop@gmail.com> wrote:
> ****
>
> Hi Users,****
>
>  ****
>
> I have formatted hadoop cluster, formatted successfully. after stop &start
> hadoop, i hit the jps command in master, getting fine, but in slave machine
> am not getting data node, while see the data node log file, i am getting
> following error.****
>
>  ****
>
> Data node(slave1):****
>
> 2012-08-08 00:16:44,033 WARN
> org.apache.hadoop.hdfs.server.datanode.DataBlockScanner: Second
> Verification failed for blk_-3831635302961953167_1690. Exception : java.io
> .
> IOException: Block blk_-3831635302961953167_1690 is not valid.
>         at
> org.apache.hadoop.hdfs.server.datanode.FSDataset.getBlockFile(FSDataset.java:1072)
>         at
> org.apache.hadoop.hdfs.server.datanode.FSDataset.getLength(FSDataset.java:1035)
>         at
> org.apache.hadoop.hdfs.server.datanode.FSDataset.getVisibleLength(FSDataset.java:1045)
>         at
> org.apache.hadoop.hdfs.server.datanode.BlockSender.<init>(BlockSender.java:94)
>         at
> org.apache.hadoop.hdfs.server.datanode.BlockSender.<init>(BlockSender.java:81)
>         at
> org.apache.hadoop.hdfs.server.datanode.DataBlockScanner.verifyBlock(DataBlockScanner.java:453)
>         at
> org.apache.hadoop.hdfs.server.datanode.DataBlockScanner.verifyFirstBlock(DataBlockScanner.java:519)
>         at
> org.apache.hadoop.hdfs.server.datanode.DataBlockScanner.run(DataBlockScanner.java:617)
>         at java.lang.Thread.run(Thread.java:662)****
>
>
> *data node(slave2)*****
>
> 2012-08-08 13:03:50,195 ERROR
> org.apache.hadoop.hdfs.server.datanode.DataNode: java.io.IOException:
> Incompatible namespaceIDs in /app/hadoop/tmp/dfs/data: namenode name
> spaceID = 1434906924; datanode namespaceID = 474761520
>         at
> org.apache.hadoop.hdfs.server.datanode.DataStorage.doTransition(DataStorage.java:232)
>         at
> org.apache.hadoop.hdfs.server.datanode.DataStorage.recoverTransitionRead(DataStorage.java:147)
>         at
> org.apache.hadoop.hdfs.server.datanode.DataNode.startDataNode(DataNode.java:385)
>         at
> org.apache.hadoop.hdfs.server.datanode.DataNode.<init>(DataNode.java:299)
>         at
> org.apache.hadoop.hdfs.server.datanode.DataNode.makeInstance(DataNode.java:1582)
>         at
> org.apache.hadoop.hdfs.server.datanode.DataNode.instantiateDataNode(DataNode.java:1521)
>         at
> org.apache.hadoop.hdfs.server.datanode.DataNode.createDataNode(DataNode.java:1539)
>         at
> org.apache.hadoop.hdfs.server.datanode.DataNode.secureMain(DataNode.java:1665)
>         at
> org.apache.hadoop.hdfs.server.datanode.DataNode.main(DataNode.java:1682)**
> **
>
>  ****
>
> Please help me on this issue.****
>
>  ****
>
> Thanks,****
>
> Prabhu.****
>
>
>
> ****
>
> --
> Thanks & Regards,
> Anil Gupta****
>
>
>
>
> --
> Thanks & Regards,
> Anil Gupta****
>



-- 
Thanks,
sandeep

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