Hi yufeng629：
If the master shutdown normally, the shutdown hook will make sure all
the messages in commitlog to be dispatched.And if the master shutdown
abnormally(kill -9 or power off), the commitlog will redispatch the
messages according to the store check point.
You could check the code in CommmitLog.
Best Regards
dongeforever
2018-08-13 12:02 GMT+08:00 GitBox <[email protected]>:
> yufeng629 opened a new issue #405: Master power off may cause consumeQueue
> diff from commitLog
> URL: https://github.com/apache/rocketmq/issues/405
>
>
> if there are some messages, all of then had flushed to commit log, but
> no dispatch to consumeQueue, at that moment ,the Master Broker power off,
> when the Master restart, those message will never dispatch to consumeQueue,
> because the reputFromOffset property of the ReputMessageService was set to
> the maxOffset of the last MappedFile when the DefaultMessageStore start
> 
> if this sitution is true, it will cause message lost
>
>
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