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From Harsh J <ha...@cloudera.com>
Subject Re: MultipleTextOutputFormat - temp dir does not exist error
Date Wed, 08 Jun 2011 16:51:08 GMT
Madhu,

Are you multi-threading in your Reducer code by any chance? MTOF may
not be thread-safe in the release you're using. Using MultipleOutputs
is recommended right now, if this is the cause/case.

On Wed, Jun 8, 2011 at 7:58 PM, Madhu Ramanna <madhu@buysight.com> wrote:
> Hello,
>
> We're using CDH3b3 0.20.2 hadoop. In our map reduce jobs we've extended MultipleTextOutputFormat
to override checkOutputSpecs() and generateFileNameForKeyValue() returning
> relative path based on key. I don't have multiple jobs running with the same output directory.
When I rerun it succeeds; a couple of runs later it fails. Here is a log from failed attempts:
>
>
> attempt 0
>
> java.io.IOException: The temporary job-output directory
> hdfs://nn:8000/griffin/prod/_temporary doesn't exist! at
> org.apache.hadoop.mapred.FileOutputCommitter.getWorkPath(FileOutputCommitte r.java:
> 250) at
> org.apache.hadoop.mapred.FileOutputFormat.getTaskOutputPath(FileOutputForma t.java:
> 240) at
> org.apache.hadoop.mapred.TextOutputFormat.getRecordWriter(TextOutputFormat. java:
> 129) at
> org.apache.hadoop.mapred.lib.MultipleTextOutputFormat.getBaseRecordWriter(M ultipleTextOutputFormat.java:
> 47) at org.apache.hadoop.mapred.lib.MultipleOutputFormat
> $1.write(MultipleOutputFormat.java:102) at
> org.apache.hadoop.mapred.ReduceTask$3.collect(ReduceTask.java:444) at
> com.buysight.griffin.UserHistory$MyReducer.reduce(UserHistory.java:
> 672) at com.buysight.griffin.UserHistory
> $MyReducer.reduce(UserHistory.java:148) at
> org.apache.hadoop.mapred.ReduceTask.runOldReducer(ReduceTask.java:467)
> at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:415) at
> org.apache.hadoop.mapred.Child$4.run(Child.java:217) at
> java.security.AccessController.doPrivileged(Native Method) at
> javax.security.auth.Subject.doAs(Subject.java:396) at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.j ava:
> 1063) at org.apache.hadoop.mapred.Child.main(Child.java:211)
>
> attempt 1
>
> org.apache.hadoop.ipc.RemoteException:
> org.apache.hadoop.hdfs.server.namenode.LeaseExpiredException: No lease
> on /griffin/prod/_temporary/_attempt_201106061713_0045_r_000000_1/
> s2_conv/20110530/part-00000.bz2 File does not exist. Holder
> DFSClient_attempt_201106061713_0045_r_000000_1 does not have any open
> files. at
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.checkLease(FSNamesystem .java:
> 1488) at
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.checkLease(FSNamesystem .java:
> 1479) at
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNa mesystem.java:
> 1395) at
> org.apache.hadoop.hdfs.server.namenode.NameNode.addBlock(NameNode.java:
> 588) at sun.reflect.GeneratedMethodAccessor249.invoke(Unknown Source)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImp l.java:
> 25) at java.lang.reflect.Method.invoke(Method.java:597) at
> org.apache.hadoop.ipc.RPC$Server.call(RPC.java:528) at
> org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1319) at
> org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1315) at
> java.security.AccessController.doPrivileged(Native Method) at
> javax.security.auth.Subject.doAs(Subject.java:396) at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.j ava:
> 1063) at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1313) at
> org.apache.hadoop.ipc.Client.call(Client.java:1054) at
> org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:226) at
> $Proxy1.addBlock(Unknown Source) at
> sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:
> 39) at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImp l.java:
> 25) at java.lang.reflect.Method.invoke(Method.java:597) at
> org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocat ionHandler.java:
> 82) at
> org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHan dler.java:
> 59) at $Proxy1.addBlock(Unknown Source) at
> org.apache.hadoop.hdfs.DFSClient
> $DFSOutputStream.locateFollowingBlock(DFSClient.java:3166) at
> org.apache.hadoop.hdfs.DFSClient
> $DFSOutputStream.nextBlockOutputStream(DFSClient.java:3036) at
> org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.access
> $1900(DFSClient.java:2288) at org.apache.hadoop.hdfs.DFSClient
> $DFSOutputStream$DataStreamer.run(DFSClient.java:2483)
>
> I've tried turning off speculative execution. Still no luck.  What gives ?
>
> Thanks,
> Madhu
>



-- 
Harsh J

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