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From "Vinay Kumar Thota (JIRA)" <j...@apache.org>
Subject [jira] Created: (MAPREDUCE-2016) GridMix throws an ArithmeticException error when tasktracker count is zero while generating the data.
Date Tue, 17 Aug 2010 10:26:17 GMT
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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