[GitHub] [rocketmq] maoyiyong-svg opened a new issue, #4829: RocketMq内存映射文件的具体实现MappedFile中关于方法commit0()中往channel中写数据的优化。

Tue, 16 Aug 2022 19:28:10 -0700 


maoyiyong-svg opened a new issue, #4829:
URL: https://github.com/apache/rocketmq/issues/4829

   
在org.apache.rocketmq.store.MappedFile#commit0中使用“this.fileChannel.write(byteBuffer);”导致没有利用文件内存映射机制，导致写入效率降低。
   原因：
   
在MappedFile对象实例化的时候就会实例化fileChannel和MappedByteBuffer，完成之后在finally中可以直接关闭fileChannel，之后的数据读写应该使用MappedByteBuffer，通过文件内存映射来操作。
   
![image](https://user-images.githubusercontent.com/62745186/185017246-044241e1-5703-434b-a8e8-5946d66af6ae.png)
   此处建议使用mappedByteBuffer进行数据写入。
   
![image](https://user-images.githubusercontent.com/62745186/185020982-007dbe10-ad61-45e3-99e7-670b93aef5e4.png)
   


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