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Date: Wed, 18 Jun 2014 05:43:02 +0000 (UTC)
From: "Gera Shegalov (JIRA)" <jira@apache.org>
To: mapreduce-dev@hadoop.apache.org
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Subject: [jira] [Created] (MAPREDUCE-5931) Validate SleepJob command line
 parameters
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Gera Shegalov created MAPREDUCE-5931:
----------------------------------------

             Summary: Validate SleepJob command line parameters
                 Key: MAPREDUCE-5931
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5931
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: test
    Affects Versions: 1.2.1, 2.4.0
            Reporter: Gera Shegalov
            Assignee: Gera Shegalov
            Priority: Minor


This is a minor issue per se. I had a typo in my script specifying a negative number of reducers for the SleepJob. It results in the exception that is far from the root cause, and appeared as a serious issue with the map-side sort.

{noformat}
2014-06-17 21:42:48,072 INFO [main] org.apache.hadoop.mapred.MapTask: Ignoring exception during close for org.apache.hadoop.mapred.MapTask$NewOutputCollector@972141f
java.lang.NullPointerException
	at org.apache.hadoop.mapred.MapTask$MapOutputBuffer.flush(MapTask.java:1447)
	at org.apache.hadoop.mapred.MapTask$NewOutputCollector.close(MapTask.java:700)
	at org.apache.hadoop.mapred.MapTask.closeQuietly(MapTask.java:1990)
	at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:774)
	at org.apache.hadoop.mapred.MapTask.run(MapTask.java:340)
	at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:173)
	at java.security.AccessController.doPrivileged(Native Method)
	at javax.security.auth.Subject.doAs(Subject.java:415)
	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1626)
	at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:168)
2014-06-17 21:42:48,075 WARN [main] org.apache.hadoop.mapred.YarnChild: Exception running child : java.lang.IllegalArgumentException
	at java.nio.ByteBuffer.allocate(ByteBuffer.java:330)
	at org.apache.hadoop.mapred.SpillRecord.<init>(SpillRecord.java:51)
	at org.apache.hadoop.mapred.MapTask$MapOutputBuffer.mergeParts(MapTask.java:1824)
	at org.apache.hadoop.mapred.MapTask$MapOutputBuffer.flush(MapTask.java:1484)
	at org.apache.hadoop.mapred.MapTask$NewOutputCollector.close(MapTask.java:700)
	at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:770)
	at org.apache.hadoop.mapred.MapTask.run(MapTask.java:340)
	at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:173)
	at java.security.AccessController.doPrivileged(Native Method)
	at javax.security.auth.Subject.doAs(Subject.java:415)
	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1626)
	at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:168)
{noformat}



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