I'm seeing this error message sequence over and over again on all of my
map-reducing nodes hadoop-msp-tasktracker-hadoop-<nodename>.log file:
2010-04-05 14:58:52,047 INFO org.apache.hadoop.mapred.TaskTracker:
LaunchTaskAction (registerTask): attempt_201004051839_0012_m_000168_3 task's
state:UNASSIGNED
2010-04-05 14:58:52,047 INFO org.apache.hadoop.mapred.TaskTracker: Trying to
launch : attempt_201004051839_0012_m_000168_3
2010-04-05 14:58:52,047 INFO org.apache.hadoop.mapred.TaskTracker: In
TaskLauncher, current free slots : 2 and trying to launch
attempt_201004051839_0012_m_000168_3
2010-04-05 14:58:52,079 WARN org.mortbay.log: /tasklog: java.io.IOException:
Closed
2010-04-05 14:58:52,088 WARN org.mortbay.log: /tasklog: java.io.IOException:
Closed
2010-04-05 14:58:52,099 INFO org.apache.hadoop.mapred.JvmManager: In
JvmRunner constructed JVM ID: jvm_201004051839_0012_m_-958381544
2010-04-05 14:58:52,099 INFO org.apache.hadoop.mapred.JvmManager: JVM Runner
jvm_201004051839_0012_m_-958381544 spawned.
2010-04-05 14:58:52,137 INFO org.apache.hadoop.mapred.JvmManager: JVM :
jvm_201004051839_0012_m_-958381544 exited. Number of tasks it ran: 0
2010-04-05 14:58:52,137 WARN org.apache.hadoop.mapred.TaskRunner:
attempt_201004051839_0012_m_000168_3 Child Error
java.io.IOException: Task process exit with nonzero status of 127.
at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:418)
2010-04-05 14:58:55,146 INFO org.apache.hadoop.mapred.TaskRunner:
attempt_201004051839_0012_m_000168_3 done; removing files.
2010-04-05 14:58:55,147 INFO org.apache.hadoop.mapred.TaskTracker:
addFreeSlot : current free slots : 2
I can find no log file anywhere that tells me *why* there was a Child Error
or why it exited with a 127 status. In my client, I'm seeing this over and
over and it looks pretty likely it's related:
Apr 5, 2010 7:07:27 PM org.apache.hadoop.mapred.JobClient getTaskLogs
WARNING: Error reading task
outputhttp://<each-of-my-cluster-hosts>:50060/tasklog?plaintext=true&taskid=attempt_201004051839_0021_m_000167_1&filter=stdout
Apr 5, 2010 7:07:27 PM org.apache.hadoop.mapred.JobClient getTaskLogs
WARNING: Error reading task
outputhttp://<each-of-my-cluster-hosts>:50060/tasklog?plaintext=true&taskid=attempt_201004051839_0021_m_000167_1&filter=stderr
Thanks for any help you can provide. Even a pointer to some log file I'm
missing would be great.
Thanks again,
David Swift
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