[MAPREDUCE-4689] JobClient.getMapTaskReports on failed job results in NPE

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.23.3
• Fix Version/s: 2.0.2-alpha, 0.23.4
• Component/s: client
• Target Version/s: 0.23.4, 2.0.3-alpha
• Assignee: Jason Darrell Lowe
• Reporter: Jason Darrell Lowe
• Created: 26/Sep/12 23:06
• Updated: 04/Sep/14 00:57
• Resolved: 28/Sep/12 22:32

Description

When calling JobClient.getMapTaskReports for a job that has failed results in an NPE. For example:

Exception in thread "main" java.lang.NullPointerException
	at org.apache.hadoop.mapreduce.counters.AbstractCounters.<init>(AbstractCounters.java:107)
	at org.apache.hadoop.mapred.Counters.<init>(Counters.java:71)
	at org.apache.hadoop.mapred.Counters.downgrade(Counters.java:80)
	at org.apache.hadoop.mapred.TaskReport.downgrade(TaskReport.java:81)
	at org.apache.hadoop.mapred.TaskReport.downgradeArray(TaskReport.java:88)
	at org.apache.hadoop.mapred.JobClient.getTaskReports(JobClient.java:691)
	at org.apache.hadoop.mapred.JobClient.getMapTaskReports(JobClient.java:681)
...

Issue Links

• relates to: MAPREDUCE-4693 Historyserver should provide counters for failed tasks