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Posted to dev@rocketmq.apache.org by GitBox <gi...@apache.org> on 2022/08/17 06:33:24 UTC

[GitHub] [rocketmq] RongtongJin commented on issue #4829: Suggestion of commit0 method in MappedFile

RongtongJin commented on issue #4829:
URL: https://github.com/apache/rocketmq/issues/4829#issuecomment-1217520381

   @maoyiyong-svg 你好，MappedFile commit方法是在transientStorePoolEnable开启后使用的，其作用时将消息数据从RocketMQ自己管理的堆外内存写入到文件中（后面再由flush线程刷到磁盘），所以代码中出现了writeBuffer中的数据写到fileChannel中，实际上当开启transientStorePoolEnable后，写消息数据都是先写入到writeBuffer而非到内存映射的mappedByteBuffer（若不开启transientStorePoolEnable则是直接写到内存映射文件中）。


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