iamzhoug37 commented on issue #249: master-slave sync model performance improve
URL: https://github.com/apache/rocketmq/issues/249#issuecomment-396801624
   first question: the flush disk and slave fetch message  are performed 
   second question: I guess you are using sync_flush,the flush of dis or other 
in lock operation cost too much time,then causes the other thread wait on lock 
cost too much.The lock has cost,but this cost is acceptable compared to disk 

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