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From "Srikanth Kakani (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-1740) Certain Pipes tasks fail, after exiting the C++ application
Date Mon, 20 Aug 2007 22:53:30 GMT
Certain Pipes tasks fail, after exiting the C++ application
-----------------------------------------------------------

                 Key: HADOOP-1740
                 URL: https://issues.apache.org/jira/browse/HADOOP-1740
             Project: Hadoop
          Issue Type: Bug
          Components: pipes
         Environment: Version: 0.15.0-dev, r565628
Compiled: Tue Aug 14 20:55:37 UTC 2007 by hadoopqa
165 nodes
            Reporter: Srikanth Kakani
            Priority: Critical


Steps to reproduce:
Run a pipes job. I had 1182 mappers and 300 reducers and produced 4,353,892,559  records and
212,030,552,146 bytes output.

Some of the tasks failed (randomly), all had the same exception (probably a race condition)

task_200708201818_0002_m_000681_0	tip_200708201818_0002_m_000681	fwm521075.inktomisearch.com
FAILED	

java.lang.NullPointerException
	at org.apache.hadoop.mapred.MapTask$MapOutputBuffer.flush(MapTask.java:592)
	at org.apache.hadoop.mapred.MapTask.run(MapTask.java:190)
	at org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:1800)

	Last 4KB
Last 8KB
All
task_200708201818_0002_m_000681_1	tip_200708201818_0002_m_000681	fwm521127.inktomisearch.com
FAILED	

java.lang.NullPointerException
	at org.apache.hadoop.mapred.MapTask$MapOutputBuffer.flush(MapTask.java:592)
	at org.apache.hadoop.mapred.MapTask.run(MapTask.java:190)
	at org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:1800)

	Last 4KB
Last 8KB
All
task_200708201818_0002_m_000868_0	tip_200708201818_0002_m_000868	fwm521160.inktomisearch.com
FAILED	

java.io.IOException: Task process exit with nonzero status of 1.
	at org.apache.hadoop.mapred.TaskRunner.runChild(TaskRunner.java:405)
	at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:291)

	Last 4KB
Last 8KB
All

2007-08-20 19:25:59,909 INFO org.apache.hadoop.metrics.jvm.JvmMetrics: Initializing JVM Metrics
with processName=MAP, sessionId=
2007-08-20 19:26:00,002 INFO org.apache.hadoop.mapred.MapTask: numReduceTasks: 300
2007-08-20 19:26:01,344 INFO org.apache.hadoop.util.NativeCodeLoader: Loaded the native-hadoop
library
2007-08-20 19:26:01,345 INFO org.apache.hadoop.io.compress.zlib.ZlibFactory: Successfully
loaded & initialized native-zlib library
2007-08-20 19:49:26,727 WARN org.apache.hadoop.mapred.TaskTracker: Error running child
java.lang.NullPointerException
	at org.apache.hadoop.mapred.MapTask$MapOutputBuffer.flush(MapTask.java:592)
	at org.apache.hadoop.mapred.MapTask.run(MapTask.java:190)
	at org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:1800)

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