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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