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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-2297) All map reduce tasks are failing if we give invalid path jar file for Job
Date Fri, 20 May 2011 19:18:47 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2297?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13037013#comment-13037013
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Todd Lipcon commented on MAPREDUCE-2297:
----------------------------------------

bq. Consider the case of Hive, if we configure any invalid path for the property "hive.aux.jars.path"
all the jobs will fail which is not using that jar also.

I would consider it a broken config if you configure hive.aux.jars.path to point to a jar
which doesn't exist.

In your patch, if you accidentally make a typo in your DistributedCache entries, you'll see
NoClassDefFound exceptions or other much scarier errors. I think it's better to fail with
the "File does not exist" error during localization.

> All map reduce tasks are failing if we give invalid path jar file for Job
> -------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-2297
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2297
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: tasktracker
>    Affects Versions: 0.20.2
>            Reporter: Devaraj K
>            Assignee: Devaraj K
>            Priority: Minor
>             Fix For: 0.20.4
>
>         Attachments: MAPREDUCE-2297.patch
>
>
> This can be reproduced by giving the invalid jar file for the Job or it can be reproduced
from hive.
> In hive-default.xml
> <property>
> <name>hive.aux.jars.path</name>
> <value></value>
> <description>Provided for adding auxillaryjarsPath</description>
> </property>
> If we configure an invalid path for jar file, It is making all map reduce tasks to fail
even those jobs are not depending on this jar file and it is giving the below exception.
> {code:xml} 
> hive> select * from a join b on(a.b=b.c);
> Total MapReduce jobs = 1
> Launching Job 1 out of 1
> Number of reduce tasks not specified. Estimated from input data size: 1
> In order to change the average load for a reducer (in bytes):
> set hive.exec.reducers.bytes.per.reducer=<number>
> In order to limit the maximum number of reducers:
> set hive.exec.reducers.max=<number>
> In order to set a constant number of reducers:
> set mapred.reduce.tasks=<number>
> java.io.FileNotFoundException: File does not exist: /user/root/grade.jar
> at org.apache.hadoop.hdfs.DistributedFileSystem.getFileStatus(DistributedFileSystem.java:495)
> at org.apache.hadoop.filecache.DistributedCache.getTimestamp(DistributedCache.java:509)
> at org.apache.hadoop.mapred.JobClient.configureCommandLineOptions(JobClient.java:651)
> at org.apache.hadoop.mapred.JobClient.submitJobInternal(JobClient.java:783)
> at org.apache.hadoop.mapred.JobClient.submitJob(JobClient.java:752)
> at org.apache.hadoop.hive.ql.exec.ExecDriver.execute(ExecDriver.java:698)
> at org.apache.hadoop.hive.ql.exec.Task.executeTask(Task.java:107)
> at org.apache.hadoop.hive.ql.exec.TaskRunner.runSequential(TaskRunner.java:64)
> {code} 

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