[GitHub] lizhanhui commented on issue #348: [TIMEOUT_CLEAN_QUEUE]broker busy

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

lizhanhui commented on issue #348: [TIMEOUT_CLEAN_QUEUE]broker busy
URL: https://github.com/apache/rocketmq/issues/348#issuecomment-403342028
 
 
   The short answer is: In your broker configuration file, configure this entry: waitTimeMillsInSendQueue to a larger value to override the default one: 200.
   
   Long answer:
   When configured as synchronous disk IO flush, it takes time to sync data of a small batch of messages to disk before writing responses to message sender. Those unprocessed requests are buffered in a queue. To ensure broker won't suspend producer excessive long period of time, it will expire sending requests if they are not processed within `waitTimeMillsInSendQueue`, which may block application too long in case synchronous sending API is employed.  This strategy, in general, is called __fail-early, fail-fast__. 
   
   The default value is tuned for asynchrous disk flushing. In case synchronous disk flushing is used, you'd better __measure and tune__.

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