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From "Doug Judd (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-895) Reduce hang on small set of SequenceFiles (reproducible)
Date Thu, 18 Jan 2007 08:07:29 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-895?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12465677
] 

Doug Judd commented on HADOOP-895:
----------------------------------

I'm seeing the following messages (and Exception) in the tasktracker log file ...

2007-01-17 00:03:36,489 INFO org.apache.hadoop.mapred.TaskTracker: task_0001_r_000000_0 0.0%
reduce > copy >
2007-01-17 00:03:41,493 INFO org.apache.hadoop.mapred.TaskRunner: task_0001_r_000000_0 Need
3 map output(s)
2007-01-17 00:03:41,494 INFO org.apache.hadoop.mapred.TaskRunner: task_0001_r_000000_0 Got
3 known map output location(s); scheduling...
2007-01-17 00:03:41,494 INFO org.apache.hadoop.mapred.TaskRunner: task_0001_r_000000_0 Scheduled
0 of 3 known outputs (3 slow hosts and 0 dup hosts)
2007-01-17 00:03:41,494 INFO org.apache.hadoop.mapred.TaskTracker: task_0001_r_000000_0 0.0%
reduce > copy >
2007-01-17 00:03:46,498 INFO org.apache.hadoop.mapred.TaskRunner: task_0001_r_000000_0 Need
3 map output(s)
2007-01-17 00:03:46,498 INFO org.apache.hadoop.mapred.TaskRunner: task_0001_r_000000_0 Got
3 known map output location(s); scheduling...
2007-01-17 00:03:46,498 INFO org.apache.hadoop.mapred.TaskRunner: task_0001_r_000000_0 Scheduled
1 of 3 known outputs (0 slow hosts and 2 dup hosts)
2007-01-17 00:03:46,498 INFO org.apache.hadoop.mapred.TaskRunner: task_0001_r_000000_0 Copying
task_0001_m_000001_0 output from motherlode000.zvents.com.
2007-01-17 00:03:46,501 WARN org.apache.hadoop.mapred.TaskRunner: task_0001_r_000000_0 copy
failed: task_0001_m_000001_0 from motherlode000.zvents.com
2007-01-17 00:03:46,501 WARN org.apache.hadoop.mapred.TaskRunner: java.io.IOException: Server
returned HTTP response code: 500 for URL: http://motherlode000.zvents.com:50060/mapOutput?map=task_000\
1_m_000001_0&reduce=0
        at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1174)
        at org.apache.hadoop.mapred.MapOutputLocation.getFile(MapOutputLocation.java:121)
        at org.apache.hadoop.mapred.ReduceTaskRunner$MapOutputCopier.copyOutput(ReduceTaskRunner.java:236)
        at org.apache.hadoop.mapred.ReduceTaskRunner$MapOutputCopier.run(ReduceTaskRunner.java:199)

2007-01-17 00:03:46,501 WARN org.apache.hadoop.mapred.TaskRunner: task_0001_r_000000_0 adding
host motherlode000.zvents.com to penalty box, next contact in 278 seconds
2007-01-17 00:03:46,501 INFO org.apache.hadoop.mapred.TaskRunner: task_0001_r_000000_0 Need
3 map output(s)
2007-01-17 00:03:46,501 INFO org.apache.hadoop.mapred.TaskRunner: task_0001_r_000000_0 Need
3 map output location(s)
2007-01-17 00:03:46,502 INFO org.apache.hadoop.mapred.TaskRunner: task_0001_r_000000_0 Got
3 map outputs from jobtracker
2007-01-17 00:03:46,502 INFO org.apache.hadoop.mapred.TaskRunner: task_0001_r_000000_0 Got
3 known map output location(s); scheduling...
2007-01-17 00:03:46,502 INFO org.apache.hadoop.mapred.TaskRunner: task_0001_r_000000_0 Scheduled
0 of 3 known outputs (3 slow hosts and 0 dup hosts)
2007-01-17 00:03:46,502 INFO org.apache.hadoop.mapred.TaskTracker: task_0001_r_000000_0 0.0%
reduce > copy >
2007-01-17 00:03:51,506 INFO org.apache.hadoop.mapred.TaskRunner: task_0001_r_000000_0 Need
3 map output(s)
2007-01-17 00:03:51,506 INFO org.apache.hadoop.mapred.TaskRunner: task_0001_r_000000_0 Got
3 known map output location(s); scheduling...
2007-01-17 00:03:51,506 INFO org.apache.hadoop.mapred.TaskRunner: task_0001_r_000000_0 Scheduled
0 of 3 known outputs (3 slow hosts and 0 dup hosts)
2007-01-17 00:03:51,506 INFO org.apache.hadoop.mapred.TaskTracker: task_0001_r_000000_0 0.0%
reduce > copy >
2007-01-17 00:03:56,510 INFO org.apache.hadoop.mapred.TaskRunner: task_0001_r_000000_0 Need
3 map output(s)
2007-01-17 00:03:56,510 INFO org.apache.hadoop.mapred.TaskRunner: task_0001_r_000000_0 Got
3 known map output location(s); scheduling...
2007-01-17 00:03:56,510 INFO org.apache.hadoop.mapred.TaskRunner: task_0001_r_000000_0 Scheduled
0 of 3 known outputs (3 slow hosts and 0 dup hosts)
2007-01-17 00:03:56,510 INFO org.apache.hadoop.mapred.TaskTracker: task_0001_r_000000_0 0.0%
reduce > copy >
2007-01-17 00:04:01,514 INFO org.apache.hadoop.mapred.TaskRunner: task_0001_r_000000_0 Need
3 map output(s)
2007-01-17 00:04:01,514 INFO org.apache.hadoop.mapred.TaskRunner: task_0001_r_000000_0 Got
3 known map output location(s); scheduling...
2007-01-17 00:04:01,514 INFO org.apache.hadoop.mapred.TaskRunner: task_0001_r_000000_0 Scheduled
0 of 3 known outputs (3 slow hosts and 0 dup hosts)
2007-01-17 00:04:01,514 INFO org.apache.hadoop.mapred.TaskTracker: task_0001_r_000000_0 0.0%
reduce > copy >


> Reduce hang on small set of SequenceFiles (reproducible)
> --------------------------------------------------------
>
>                 Key: HADOOP-895
>                 URL: https://issues.apache.org/jira/browse/HADOOP-895
>             Project: Hadoop
>          Issue Type: Bug
>          Components: mapred
>    Affects Versions: 0.10.1
>         Environment: This happens both on a mac and on a Linux x86_64 machine.
>            Reporter: Doug Judd
>         Attachments: hangmod-patchfile
>
>
> I'm running into a problem where a Map/Reduce job hangs in the reduce phase.  It happens
on a simple program to dump the keys of a small set of SequenceFiles.  It can be reproduced
as follows:
> 1. Pull a vanilla hadoop-0.10.1 release and untar it
> 2. Apply the attached patch
> 3. Modify conf/hadoop-env.sh to have the correct JAVA_HOME
> 4. Run the following script:
> #!/bin/sh
> ant zvents
> ./bin/hadoop namenode -format
> mkdir fs-hadoop/dfs/tmp
> mkdir fs-hadoop/dfs/data
> mkdir -p fs-hadoop/mapred/local
> ./bin/start-all.sh
> sleep 5
> ./bin/hadoop dfs -mkdir /heritrix
> ./bin/hadoop dfs -mkdir /heritrix/crawls
> ./bin/hadoop dfs -mkdir /heritrix/crawls/test-4-20070116061502956
> ./bin/hadoop dfs -copyFromLocal data/IAH-20070116061532-00000-doug-judds-computer.local
/heritrix/crawls/test-4-20070116061502956
> ./bin/hadoop dfs -copyFromLocal data/IAH-20070116061539-00001-doug-judds-computer.local
/heritrix/crawls/test-4-20070116061502956
> ./bin/hadoop dfs -copyFromLocal data/IAH-20070116061539-00002-doug-judds-computer.local
/heritrix/crawls/test-4-20070116061502956
> ./bin/hadoop com.zvents.hadoop.DumpUrls /heritrix/crawls/test-4-20070116061502956 /foo
> - Doug

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