[GitHub] [rocketmq] qqeasonchen opened a new issue #1400: Disk space detection is blocked when it cost too much time to delete files

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

qqeasonchen opened a new issue #1400: Disk space detection is blocked when it cost too much time to delete files
URL: https://github.com/apache/rocketmq/issues/1400
 
 
   **BUG REPORT**
   
   1. Please describe the issue you observed:
       在DefaultMessageStore类中，为了删除过期的文件调用了deleteExpiredFiles()，其中为了检查磁盘的使用情况调用了isSpaceToDelete()函数，如果磁盘使用率达到阈值会触发过期文件的删除。
       其中有一个标志变量diskok来标识磁盘是否即将写满（大于diskSpaceWarningLevelRatio），如果是，broker将会拒绝接受消息。
       如果在调用isSpaceToDelete时磁盘的使用率大于阈值触发了磁盘文件的删除，但使用率未达到
   diskSpaceWarningLevelRatio不会置位diskok，这意味着broker会继续写入消息。如果此时写入消息的速度超过了文件删除的速度，磁盘使用率会继续上升，当达到diskSpaceWarningLevelRatio时，由于还在执行isSpaceToDelete中的删除代码，无法查询磁盘的使用率，标志变量diskok就无法及时更新，磁盘可能就完全写满导致出错。
   
   
   3. Other information (e.g. detailed explanation, logs, related issues, suggestions how to fix, etc):
   建议使用单独的查询线程来更新标志变量diskok。
   
   

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