HADOOP-12730. Hadoop streaming -mapper and -reducer options are wrongly documented as required. Contributed by Kengo Seki.
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@ -1642,6 +1642,9 @@ Release 2.8.0 - UNRELEASED
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HADOOP-12659. Incorrect usage of config parameters in token manager of
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KMS. (Mingliang Liu via xyao)
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HADOOP-12730. Hadoop streaming -mapper and -reducer options are wrongly
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documented as required. (Kengo Seki via aajisaka)
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Release 2.7.3 - UNRELEASED
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INCOMPATIBLE CHANGES
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@ -96,8 +96,8 @@ The Hadoop streaming command options are listed here:
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|:---- |:---- |:---- |
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| -input directoryname or filename | Required | Input location for mapper |
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| -output directoryname | Required | Output location for reducer |
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| -mapper executable or JavaClassName | Required | Mapper executable |
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| -reducer executable or JavaClassName | Required | Reducer executable |
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| -mapper executable or JavaClassName | Optional | Mapper executable. If not specified, IdentityMapper is used as the default |
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| -reducer executable or JavaClassName | Optional | Reducer executable. If not specified, IdentityReducer is used as the default |
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| -file filename | Optional | Make the mapper, reducer, or combiner executable available locally on the compute nodes |
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| -inputformat JavaClassName | Optional | Class you supply should return key/value pairs of Text class. If not specified, TextInputFormat is used as the default |
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| -outputformat JavaClassName | Optional | Class you supply should take key/value pairs of Text class. If not specified, TextOutputformat is used as the default |
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