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From Harsh J <ha...@cloudera.com>
Subject Re: namenode not starting
Date Sat, 25 Aug 2012 14:15:51 GMT
Abhay,

I suspect that if you haven't set your dfs.name.dir explicitly, then
you haven't set fs.checkpoint.dir either, and since both use
hadoop.tmp.dir paths, you may have lost your data completely and there
is no recovery possible now.

On Fri, Aug 24, 2012 at 1:10 PM, Abhay Ratnaparkhi
<abhay.ratnaparkhi@gmail.com> wrote:
> Hello,
>
> I was using cluster for long time and not formatted the namenode.
> I ran bin/stop-all.sh and bin/start-all.sh scripts only.
>
> I am using NFS for dfs.name.dir.
> hadoop.tmp.dir is a /tmp directory. I've not restarted the OS.  Any way to
> recover the data?
>
> Thanks,
> Abhay
>
>
> On Fri, Aug 24, 2012 at 1:01 PM, Bejoy KS <bejoy.hadoop@gmail.com> wrote:
>>
>> Hi Abhay
>>
>> What is the value for hadoop.tmp.dir or dfs.name.dir . If it was set to
>> /tmp the contents would be deleted on a OS restart. You need to change this
>> location before you start your NN.
>> Regards
>> Bejoy KS
>>
>> Sent from handheld, please excuse typos.
>> ________________________________
>> From: Abhay Ratnaparkhi <abhay.ratnaparkhi@gmail.com>
>> Date: Fri, 24 Aug 2012 12:58:41 +0530
>> To: <user@hadoop.apache.org>
>> ReplyTo: user@hadoop.apache.org
>> Subject: namenode not starting
>>
>> Hello,
>>
>> I had a running hadoop cluster.
>> I restarted it and after that namenode is unable to start. I am getting
>> error saying that it's not formatted. :(
>> Is it possible to recover the data on HDFS?
>>
>> 2012-08-24 03:17:55,378 ERROR
>> org.apache.hadoop.hdfs.server.namenode.FSNamesystem: FSNamesystem
>> initialization failed.
>> java.io.IOException: NameNode is not formatted.
>>         at
>> org.apache.hadoop.hdfs.server.namenode.FSImage.recoverTransitionRead(FSImage.java:434)
>>         at
>> org.apache.hadoop.hdfs.server.namenode.FSDirectory.loadFSImage(FSDirectory.java:110)
>>         at
>> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.initialize(FSNamesystem.java:291)
>>         at
>> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.<init>(FSNamesystem.java:270)
>>         at
>> org.apache.hadoop.hdfs.server.namenode.NameNode.loadNamesystem(NameNode.java:271)
>>         at
>> org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:303)
>>         at
>> org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:433)
>>         at
>> org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:421)
>>         at
>> org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1359)
>>         at
>> org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1368)
>> 2012-08-24 03:17:55,380 ERROR
>> org.apache.hadoop.hdfs.server.namenode.NameNode: java.io.IOException:
>> NameNode is not formatted.
>>         at
>> org.apache.hadoop.hdfs.server.namenode.FSImage.recoverTransitionRead(FSImage.java:434)
>>         at
>> org.apache.hadoop.hdfs.server.namenode.FSDirectory.loadFSImage(FSDirectory.java:110)
>>         at
>> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.initialize(FSNamesystem.java:291)
>>         at
>> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.<init>(FSNamesystem.java:270)
>>         at
>> org.apache.hadoop.hdfs.server.namenode.NameNode.loadNamesystem(NameNode.java:271)
>>         at
>> org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:303)
>>         at
>> org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:433)
>>         at
>> org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:421)
>>         at
>> org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1359)
>>         at
>> org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1368)
>>
>> Regards,
>> Abhay
>>
>>
>



-- 
Harsh J

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