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From "Leitao Guo (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-5475) Split Information errors when input data volumn is small
Date Thu, 12 Mar 2009 08:54:51 GMT
Split Information errors when input data volumn is small
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                 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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