dongeforever commented on issue #4137:
URL: https://github.com/apache/rocketmq/issues/4137#issuecomment-1097512832
@cserwen @lwclover
As described in google's paper GFS, the side effect of zero-copy is that if
the data is not in page cache, the page fault and disk reading(usually called
cold data) will hang the netty thread.
Which will cause delays in all requests.
For MQ, Keeping low latency of sending is very important, so for
latency-sensitive applications, it is not suggested to use zero copy by default.
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