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Posted to common-dev@hadoop.apache.org by "Leitao Guo (JIRA)" <ji...@apache.org> on 2009/03/12 09:54:51 UTC

[jira] Updated: (HADOOP-5475) Split Information errors when input data volumn is trivial

     [ https://issues.apache.org/jira/browse/HADOOP-5475?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Leitao Guo updated HADOOP-5475:
-------------------------------

    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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