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From "Tom White (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4278) cannot run two local jobs in parallel from the same gateway.
Date Thu, 27 Sep 2012 11:34:09 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4278?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13464638#comment-13464638
] 

Tom White commented on MAPREDUCE-4278:
--------------------------------------

bq. This could be avoided by adding a timestamp component to local job ids?

It looks like getStagingAreaDir() is using a random number to generate a unique staging directory,
so you could reuse that unique identifier for the job ID. Also, the local job directory (localRunner)
needs to be made unique too, otherwise the job configuration file could clash. 
                
> cannot run two local jobs in parallel from the same gateway.
> ------------------------------------------------------------
>
>                 Key: MAPREDUCE-4278
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4278
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>    Affects Versions: 0.20.205.0, 0.23.1, 1.0.2
>            Reporter: Araceli Henley
>
> I cannot run two local mode jobs from Pig in parallel from the same gateway, this is
a typical use case. If I re-run the tests sequentially, then the test pass. This seems to
be a problem from Hadoop.
> Additionally, the pig harness, expects to be able to run Pig-version-undertest against
Pig-version-stable from the same gateway.
> To replicate the error:
> I have two clusters running from the same gateway.
> If I run the Pig regression suites nightly.conf in local mode in paralell - once on each
cluster. Conflicts in M/R local mode result in failures in the tests. 
> ERROR1:
> org.apache.hadoop.util.DiskChecker$DiskErrorException: Could not find
> output/file.out in any of the configured local directories
>         at
> org.apache.hadoop.fs.LocalDirAllocator$AllocatorPerContext.getLocalPathToRead(LocalDirAllocator.java:429)
>         at
> org.apache.hadoop.fs.LocalDirAllocator.getLocalPathToRead(LocalDirAllocator.java:160)
>         at
> org.apache.hadoop.mapred.MapOutputFile.getOutputFile(MapOutputFile.java:56)
>         at org.apache.hadoop.mapred.Task.calculateOutputSize(Task.java:944)
>         at org.apache.hadoop.mapred.Task.sendLastUpdate(Task.java:924)
>         at org.apache.hadoop.mapred.Task.done(Task.java:875)
>         at org.apache.hadoop.mapred.MapTask.run(MapTask.java:374)
> ---
> ERROR2:
> 2012-05-17 20:25:36,762 [main] INFO
> org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher
> -
> HadoopJobId: job_local_0001
> 2012-05-17 20:25:36,778 [Thread-3] INFO  org.apache.hadoop.mapred.Task -
> Using ResourceCalculatorPlugin : org.apache.
> hadoop.util.LinuxResourceCalculatorPlugin@ffa490e
> 2012-05-17 20:25:36,837 [Thread-3] WARN
> org.apache.hadoop.mapred.LocalJobRunner - job_local_0001
> java.lang.IndexOutOfBoundsException: Index: 1, Size: 1
>         at java.util.ArrayList.RangeCheck(ArrayList.java:547)
>         at java.util.ArrayList.get(ArrayList.java:322)
>         at
> org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigInputFormat.getLoadFunc(PigInputFormat.java
> :153)
>         at
> org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigInputFormat.createRecordReader(PigInputForm
> at.java:106)
>         at
> org.apache.hadoop.mapred.MapTask$NewTrackingRecordReader.<init>(MapTask.java:489)
>         at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:731)
>         at org.apache.hadoop.mapred.MapTask.run(MapTask.java:370)
>         at
> org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:212)
> 2012-05-17 20:25:41,291 [main] INFO
> org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher

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