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Hadoop, mail # user - No locks available


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Re: No locks available
Edward Capriolo 2011-01-17, 13:19
On Mon, Jan 17, 2011 at 8:13 AM, Adarsh Sharma <[EMAIL PROTECTED]> wrote:
> Harsh J wrote:
>>
>> Could you re-check your permissions on the $(dfs.data.dir)s for your
>> failing DataNode versus the user that runs it?
>>
>> On Mon, Jan 17, 2011 at 6:33 PM, Adarsh Sharma <[EMAIL PROTECTED]>
>> wrote:
>>
>>>
>>> Can i know why it occurs.
>>>
>>
>>
>
> Thanx Harsh , I know this issue and I cross-check several times permissions
> of of all dirs ( dfs.name.dir, dfs.data.dir, mapred.local.dir ).
>
> It is 755 and is owned by hadoop user and group.
>
> I found that in failed datanode dir , it is unable to create 5 files in
> dfs.data.dir whereas on the other hand, it creates following files in
> successsful datanode :
>
> curent
> tmp
> storage
> in_use.lock
>
> Does it helps.
>
> Thanx
>

No locks available can mean that you are trying to use hadoop on a
filesystem that does not support file level locking. Are you trying to
run your name node storage in NFS space?