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https://issues.apache.org/jira/browse/HADOOP-5475?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Leitao Guo updated HADOOP-5475:
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Summary: Split Information errors when input data volumn is trivial (was:
Split Information errors when input data volumn is small)
> Split Information errors when input data volumn is trivial
> ----------------------------------------------------------
>
> Key: HADOOP-5475
> URL: https://issues.apache.org/jira/browse/HADOOP-5475
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.19.0
> 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"
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