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Posted to dev@rocketmq.apache.org by GitBox <gi...@apache.org> on 2020/12/01 09:16:26 UTC

[GitHub] [rocketmq] BenXiangYangGuang opened a new issue #2466: MappedFile 中 MappedByteBuffer 和 TransientStorePool 中的ByteBuffer的区别

BenXiangYangGuang opened a new issue #2466:
URL: https://github.com/apache/rocketmq/issues/2466


   您好，正在学习 RocketMQ 源码，有几个问题请教一下:
   MappedByteBuffer 和 ByteBuffer 都是堆外内存（直接内存）；
   ![image](https://user-images.githubusercontent.com/20946227/100720068-6d160e00-33f8-11eb-891c-a83e3b02755b.png)
   
   ByteBuffer 有内存锁定功能，还有其他区别吗？
   


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[GitHub] [rocketmq] BenXiangYangGuang commented on issue #2466: MappedFile 中 MappedByteBuffer 和 TransientStorePool 中的ByteBuffer的区别

Posted by GitBox <gi...@apache.org>.

BenXiangYangGuang commented on issue #2466:
URL: https://github.com/apache/rocketmq/issues/2466#issuecomment-741559049


   ok，已订阅，谢谢


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[GitHub] [rocketmq] duhenglucky closed issue #2466: MappedFile 中 MappedByteBuffer 和 TransientStorePool 中的ByteBuffer的区别

Posted by GitBox <gi...@apache.org>.

duhenglucky closed issue #2466:
URL: https://github.com/apache/rocketmq/issues/2466


   


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[GitHub] [rocketmq] duhenglucky commented on issue #2466: MappedFile 中 MappedByteBuffer 和 TransientStorePool 中的ByteBuffer的区别

Posted by GitBox <gi...@apache.org>.

duhenglucky commented on issue #2466:
URL: https://github.com/apache/rocketmq/issues/2466#issuecomment-738483805


   @BenXiangYangGuang TransientStorePool 相当于在内存层面做了读写分离，写走内存吃，读走pagecache，同时最大程度消除了page cache的锁竞争，降低了毛刺，咨询类的这种问题建议走[邮件列表](https://rocketmq.apache.org/about/contact/)：），这样能够沉淀下来哈。


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