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https://issues.apache.org/jira/browse/MAPREDUCE-194?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Allen Wittenauer resolved MAPREDUCE-194.
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Resolution: Fixed
I'm going to mark this as stale.
> Split Information errors when input data volumn is trivial
> ----------------------------------------------------------
>
> Key: MAPREDUCE-194
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-194
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Environment: CentOS 5,
> hadoop-0.19.0
> Reporter: Leitao Guo
>
> The mapreduce input is a text file with only 8 lines ( filepath:
> /in_wc/pretty ), and we set "conf.setNumMapTasks(8)" in the program. I
> thought there will generate 8 maptasks, but actually, it generated 9 maptask.
> Counters of map tasks from the website show that, 0~7 maptask has "Map input
> records 1", and 8 maptask has "Map input records 0"
> The following is map task list information:
> task_200903121214_0029_m_000000
> hdfs://guoleitao:9200/in_wc/pretty:0+4
> task_200903121214_0029_m_000001
> hdfs://guoleitao:9200/in_wc/pretty:4+4
> task_200903121214_0029_m_000002
> hdfs://guoleitao:9200/in_wc/pretty:8+4
> task_200903121214_0029_m_000003
> hdfs://guoleitao:9200/in_wc/pretty:12+4
> task_200903121214_0029_m_000004
> hdfs://guoleitao:9200/in_wc/pretty:16+4
> task_200903121214_0029_m_000005
> hdfs://guoleitao:9200/in_wc/pretty:20+4
> task_200903121214_0029_m_000006
> hdfs://guoleitao:9200/in_wc/pretty:24+4
> task_200903121214_0029_m_000007
> hdfs://guoleitao:9200/in_wc/pretty:28+4
> task_200903121214_0029_m_000008
> hdfs://guoleitao:9200/in_wc/pretty:32+4
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