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From Sudharsan Sampath <sudha...@gmail.com>
Subject Re: HDFS error : Could not Complete file
Date Fri, 04 Nov 2011 09:41:57 GMT
Hi,

I think the below issue was only due to HDFS architecture and not
map-reduce. BUt just to make sure that's the case, I am cross-posting to
this group as well.
I have also attached the program used to get this error. My input file
contains abt 2 million+ records.

Any help is greatly appreciated.

Thanks
Sudhan S

On Fri, Nov 4, 2011 at 2:47 PM, Sudharsan Sampath <sudhan65@gmail.com>wrote:

> Hi,
>
> I have a simple map-reduce program [map only :) ]that reads the input and
> emits the same to n outputs on a single node cluster with max map tasks set
> to 10 on a 16 core processor machine.
>
> After a while the tasks begin to fail with the following exception log.
>
> 2011-01-01 03:17:52,149 INFO
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.audit: ugi=temp,temp
>     ip=/x.x.x.x cmd=delete
>  src=/TestMultipleOuputs1320394241986/_temporary/_attempt_201101010256_0006_m_000000_2
>   dst=null        perm=null
> 2011-01-01 03:17:52,156 INFO org.apache.hadoop.hdfs.StateChange: BLOCK*
> NameSystem.addStoredBlock: addStoredBlock request received for
> blk_7046642930904717718_23143 on x.x.x.x:<port> size 66148 But it does not
> belong to any file.
> 2011-01-01 03:17:52,156 WARN org.apache.hadoop.hdfs.StateChange: DIR*
> NameSystem.completeFile: failed to complete
> /TestMultipleOuputs1320394241986/_temporary/_attempt_201101010256_0006_m_000000_2/Output0-m-00000
> because dir.getFileBlocks() is null  and pendingFile is null
> 2011-01-01 03:17:52,156 INFO org.apache.hadoop.ipc.Server: IPC Server
> handler 12 on 9000, call
> complete(/TestMultipleOuputs1320394241986/_temporary/_attempt_201101010256_0006_m_000000_2/Output0-m-00000,
> DFSClient_attempt_201101010256_0006_m_000000_2) from x.x.x.x:<port> error:
> java.io.IOException: Could not complete write to file
> /TestMultipleOuputs1320394241986/_temporary/_attempt_201101010256_0006_m_000000_2/Output0-m-00000
> by DFSClient_attempt_201101010256_0006_m_000000_2
> java.io.IOException: Could not complete write to file
> /TestMultipleOuputs1320394241986/_temporary/_attempt_201101010256_0006_m_000000_2/Output0-m-00000
> by DFSClient_attempt_201101010256_0006_m_000000_2
>         at
> org.apache.hadoop.hdfs.server.namenode.NameNode.complete(NameNode.java:497)
>         at sun.reflect.GeneratedMethodAccessor14.invoke(Unknown Source)
>         at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>         at java.lang.reflect.Method.invoke(Method.java:597)
>         at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:512)
>         at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:968)
>         at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:964)
>         at java.security.AccessController.doPrivileged(Native Method)
>         at javax.security.auth.Subject.doAs(Subject.java:396)
>         at org.apache.hadoop.ipc.Server$Handler.run(Server.java:962)
>
>
> Looks like there's a delete command issued by FsNameSystem.audit before
> the it errors out stating it could not complete write to the file inside
> that..
>
> Any clue on what could have gone wrong?
>
> Thanks
> Sudharsan S
>

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