FAQ
Add counters for FileInputFormat (BYTES_READ) and FileOutputFormat (BYTES_WRITTEN)
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Key: MAPREDUCE-2365
URL: https://issues.apache.org/jira/browse/MAPREDUCE-2365
Project: Hadoop Map/Reduce
Issue Type: Bug
Reporter: Owen O'Malley


MAP_INPUT_BYTES and MAP_OUTPUT_BYTES will be computed using the difference between FileSystem
counters before and after each next(K,V) and collect/write op.

In case compression is being used, these counters will represent the compressed data sizes. The uncompressed size will
not be available.

This is not a direct back-port of 5710. (Counters will be computed in MapTask instead of in individual RecordReaders).

0.20.100 ->
New API -> MAP_INPUT_BYTES will be computed using this method
Old API -> MAP_INPUT_BYTES will remain unchanged.

0.23 ->
New API -> MAP_INPUT_BYTES will be computed using this method
Old API -> MAP_INPUT_BYTES likely to use this method


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postedMar 7, '11 at 10:20p
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