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https://issues.apache.org/jira/browse/HADOOP-895?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Doug Judd updated HADOOP-895:
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Attachment: hangmod-patchfile
> 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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