NullPointerException observed during task failures
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Key: MAPREDUCE-1397
URL: https://issues.apache.org/jira/browse/MAPREDUCE-1397
Project: Hadoop Map/Reduce
Issue Type: Bug
Components: tasktracker
Affects Versions: 0.20.1
Reporter: Ramya R
Priority: Minor
Fix For: 0.20.2
In an environment where many jobs are killed simultaneously, NPEs are observed
in the TT/JT logs when a task fails. The situation is aggravated when the
taskcontroller.cfg is not configured properly. Below is the exception obtained:
{noformat}
INFO org.apache.hadoop.mapred.TaskInProgress: Error from <attempt_ID>:
java.lang.Throwable: Child Error
at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:529)
Caused by: java.lang.NullPointerException
at
org.apache.hadoop.mapred.JvmManager$JvmManagerForType.getDetails(JvmManager.java:329)
at
org.apache.hadoop.mapred.JvmManager$JvmManagerForType.reapJvm(JvmManager.java:315)
at
org.apache.hadoop.mapred.JvmManager$JvmManagerForType.access$000(JvmManager.java:146)
at org.apache.hadoop.mapred.JvmManager.launchJvm(JvmManager.java:109)
at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:502)
{noformat}
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