TianyiMa created MAPREDUCE-7470:
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Summary: hadoop MR multi-thread committer
Key: MAPREDUCE-7470
URL: https://issues.apache.org/jira/browse/MAPREDUCE-7470
Project: Hadoop Map/Reduce
Issue Type: Improvement
Components: mrv2
Reporter: TianyiMa
In cloud environment, such as aws, aliyun etc., the internet delay is
non-trival when we commit thounds of files.
In our situation, the ping delay is about 0.03ms in IDC, but when move to Coud,
the ping delay is about 3ms, which is roughly 100x slower. We found that,
committing tens thounds of files will cost a few tens of minutes. The more
files there are, the logger it takes.
So we propose a new committer algorithm, which is a variant of committer
algorithm version 1, called 3. In this new algorithm 3, in order to decrease
the committer time, we use a thread pool to commit job's final output.
Our test result in Cloud production shows that, the new algorithm 3 has
decrease the committer time by serveral tens of times.
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