[GitHub] [rocketmq] qsrg commented on issue #4137: Why doesn't rocketmq send files with sendfile like Kafka?

[GitBox <gi...@apache.org>]

qsrg commented on issue #4137:
URL: https://github.com/apache/rocketmq/issues/4137#issuecomment-1103430103

   > @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.
   
   Used mmap, the page fault and disk reading still exist. 


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