areyouok opened a new pull request #3657:
URL: https://github.com/apache/rocketmq/pull/3657
**Make sure set the target branch to `develop`**
## What is the purpose of the change
speed up reput performance (relative to consumer tps) .
## Brief changelog
Use MappedByteBuffer instead of FileChannel to write consume queue and
slave commitlog.
## Verifying this change
This commit improve reput performance and speed up consume qps greatly. In
our test, produce about 200,000 tps.
72 queue consume qps: from about 70,000 to 200,000
600 queue consume qps: from about 70,000 to 110,000
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