apache / rocketmq / 5742

56%

develop: 49%

Pull #3657

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[ISSUE 3585] [Part J] Use MappedByteBuffer instead of FileChannel to write consume queue and slave commitlog.

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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