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From "Srikanth Kakani (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-1763) Too man lost task trackers - Job failures
Date Wed, 22 Aug 2007 23:02:31 GMT
Too man lost task trackers - Job failures
-----------------------------------------

                 Key: HADOOP-1763
                 URL: https://issues.apache.org/jira/browse/HADOOP-1763
             Project: Hadoop
          Issue Type: Bug
          Components: mapred
         Environment: Version: 0.15.0-dev, r565628
Compiled: Tue Aug 14 20:55:37 UTC 2007 by hadoopqa
1400 Node cluster
            Reporter: Srikanth Kakani
            Priority: Blocker


Steps to reproduce:
1 .Run a map reduce application running more than 3000 mappers, each running longer than
2. Observe the lost task trackers.

Observations:
1. Most of the lost taskTracker messages correspond to maps that have already completed
2. Based on the logs below the taskTracker is unable to connect to the job tracker and so
the jobTracker deletes the job after 20 minutes

One example:
task_200708210155_0003_m_000000_0	node1	KILLED	0.00%		21-Aug-2007 09:39:09 	Lost task tracker
  <-- Please note the time

Counters:
Map-Reduce Framework
	Map input records 	28,861
	Map output records 	1,349,114
	Map input bytes 	200,018,562
	Map output bytes 	714,878,712

Node 1 task tracker logs:
2007-08-21 09:08:51,109 INFO org.apache.hadoop.mapred.TaskTracker: Task task_200708210155_0003_m_000000_0
is done. <-- Please note the time
.
.
.
2007-08-21 09:08:52,212 INFO org.mortbay.http.SocketListener: LOW ON THREADS ((40-40+0)<1)
on SocketListener0@0.0.0.0:50060
2007-08-21 09:08:52,217 WARN org.mortbay.http.SocketListener: OUT OF THREADS: SocketListener0@0.0.0.0:50060
.
.
.
2007-08-21 09:18:53,877 ERROR org.apache.hadoop.mapred.TaskTracker: Caught exception: java.net.SocketTimeoutException:
timed out waiting for rpc response
        at org.apache.hadoop.ipc.Client.call(Client.java:472)
        at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:165)
        at org.apache.hadoop.mapred.$Proxy0.heartbeat(Unknown Source)
        at org.apache.hadoop.mapred.TaskTracker.transmitHeartBeat(TaskTracker.java:941)
        at org.apache.hadoop.mapred.TaskTracker.offerService(TaskTracker.java:840)
        at org.apache.hadoop.mapred.TaskTracker.run(TaskTracker.java:1227)
        at org.apache.hadoop.mapred.TaskTracker.main(TaskTracker.java:1911)
.
.
.
2007-08-21 09:47:45,207 INFO org.apache.hadoop.mapred.TaskTracker: Resending 'status' to 'wm501219'
with reponseId '5247
2007-08-21 09:47:46,023 INFO org.apache.hadoop.mapred.TaskTracker: Recieved RenitTrackerAction
from JobTracker
2007-08-21 09:47:46,041 INFO org.apache.hadoop.mapred.TaskRunner: task_200708210155_0003_m_000000_0
done; removing files.
2007-08-21 09:47:46,240 INFO org.apache.hadoop.mapred.TaskRunner: task_200708210155_0003_m_002237_0
done; removing files.

Tasktracker is pretty active otherwise:
tracker_wm511293.inktomisearch.com:50050	wm511293.inktomisearch.com	1	6	3

JobTracker logs:
2007-08-21 09:01:11,951 INFO org.apache.hadoop.mapred.JobTracker: Adding task 'task_200708210155_0003_m_000000_0'
to tip tip_200708210155_0003_m_000000, for tracker 'tracker_wm511293.inktomisearch.com:50050'
.
2007-08-21 09:06:27,745 INFO org.apache.hadoop.mapred.JobTracker: Adding task 'task_200708210155_0003_m_000000_1'
to tip tip_200708210155_0003_m_000000, for tracker 'tracker_wm511783.inktomisearch.com:50050'
.
2007-08-21 09:08:51,212 INFO org.apache.hadoop.mapred.JobInProgress: Task 'task_200708210155_0003_m_000000_0'
has completed tip_200708210155_0003_m_000000 successfully.
2007-08-21 09:08:51,213 INFO org.apache.hadoop.mapred.TaskInProgress: Task 'task_200708210155_0003_m_000000_0'
has completed succesfully
.
2007-08-21 09:11:27,227 INFO org.apache.hadoop.mapred.TaskInProgress: Already complete TIP
tip_200708210155_0003_m_000000 has completed task task_200708210155_0003_m_000000_1
.
2007-08-21 09:39:09,014 INFO org.apache.hadoop.mapred.TaskInProgress: Error from task_200708210155_0003_m_000000_0:
Lost task tracker
2007-08-21 09:39:09,014 INFO org.apache.hadoop.mapred.TaskInProgress: Task 'task_200708210155_0003_m_000000_0'
has been lost.
.
2007-08-21 09:39:09,348 INFO org.apache.hadoop.mapred.JobTracker: Removed completed task 'task_200708210155_0003_m_000000_0'
from 'tracker_wm511293.inktomisearch.com:50050'
.
2007-08-21 09:47:20,855 INFO org.apache.hadoop.mapred.TaskInProgress: Error from task_200708210155_0003_m_000000_1:
Lost task tracker
2007-08-21 09:47:20,855 WARN org.apache.hadoop.mapred.TaskInProgress: Recieved duplicate status
update of 'KILLED' for 'task_200708210155_0003_m_000000_1' of TIP 'tip_200708210155_0003_m_000000'



Notes:
1. I do  not see the taskTracker dying during that period
2. Is retry logic not accurate/agressive enough? (did something change recently, this behavior
is more evident in 0.15)
3. Inconsistencies with jobTracker logs? Lost task tracker detection bad?
4. TaskTracker:
          CPU usage: 9:10-9:20 50%
                                  9:20-9:40 0%
          Network Usage: 6M incl dfs operations
5. JobTracker
          CPU udage: Avg: 9%
          Network Usage:  Negligible



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