[MAPREDUCE-5931] Validate SleepJob command line parameters

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 1.2.1, 2.4.0
• Fix Version/s: 2.6.0
• Component/s: test
• Target Version/s: 2.6.0
• Hadoop Flags: Reviewed
• Assignee: Gera Shegalov
• Reporter: Gera Shegalov
• Created: 18/Jun/14 05:41
• Updated: 01/Dec/14 03:11
• Resolved: 29/Aug/14 19:54

Description

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.

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)