[jira] Commented: (MAPREDUCE-2016) GridMix throws an ArithmeticException error when tasktracker count is zero while generating the data.

["Amar Kamat (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2016?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12899371#action_12899371 ] 

Amar Kamat commented on MAPREDUCE-2016:
---------------------------------------

Vinay,
Is this related to MAPREDUCE-2009? Can we incorporate this JIRA in MAPREDUCE-2009?

> GridMix throws an ArithmeticException error when tasktracker count is zero while generating the data.
> -----------------------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-2016
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2016
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: contrib/gridmix
>    Affects Versions: 0.20.1
>            Reporter: Vinay Kumar Thota
>            Assignee: Ranjit Mathew
>
> GridMix throws an ArithmeticException error when tasktracker count is zero. In generating data, while calculating the bytes per task tracker in getSplit method, throws an exception if tasktracker count is zero. Actually bytes are calculating by dividing the number of task trackers in the cluster. So we need to build the better exception handling for these kinds of cases. Should add a condition (count should be >0) for tasktracker count before calculating the bytes per tasktracker. 
> 10/08/12 08:33:34 INFO gridmix.JobSubmitter:  Job org.apache.hadoop.mapreduce.Job@18a8ce2 submission failed 
> java.lang.ArithmeticException: / by zero
>         at org.apache.hadoop.mapred.gridmix.GenerateData$GenDataFormat.getSplits(GenerateData.java:161)
>         at org.apache.hadoop.mapred.JobClient.writeNewSplits(JobClient.java:902)
>         at org.apache.hadoop.mapred.JobClient.writeSplits(JobClient.java:919)
>         at org.apache.hadoop.mapred.JobClient.access$5(JobClient.java:913)
>         at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:838)
>         at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:1)
>         at java.security.AccessController.doPrivileged(Native Method)
>         at javax.security.auth.Subject.doAs(Subject.java:396)
>         at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1021)
>         at org.apache.hadoop.mapred.JobClient.submitJobInternal(JobClient.java:792)
>         at org.apache.hadoop.mapreduce.Job.submit(Job.java:465)
>         at org.apache.hadoop.mapred.gridmix.GenerateData$1.run(GenerateData.java:116)
>         at org.apache.hadoop.mapred.gridmix.GenerateData$1.run(GenerateData.java:101)
>         at java.security.AccessController.doPrivileged(Native Method)
>         at javax.security.auth.Subject.doAs(Subject.java:396)
>         at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1021)
>         at org.apache.hadoop.mapred.gridmix.GenerateData.call(GenerateData.java:101)
>         at org.apache.hadoop.mapred.gridmix.GenerateData.call(GenerateData.java:57)
>         at org.apache.hadoop.mapred.gridmix.JobSubmitter$SubmitTask.run(JobSubmitter.java:106)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
>         at java.lang.Thread.run(Thread.java:619)

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