Github user lizhanhui commented on the issue:
    > what's the appearance/effect of this BUG?
    Reported bug description is consume queue files cannot be automatically 
deleted and took up large portion of disk.
    > IMO, it's ok when ConsumeQueue-MappedFile hold failed, this file will be 
released by the last holder, while the empty mapped file will retain in 
MappedFileQueue, but the min consume queue offset will be corrected.
    ConsumeQueue#correctMinOffset will not work as expected if consume queue 
file hanged.  Double check the source code to figure out.
    > It seems that the only problem is the hanged consume queue only can be 
deleted when restart the broker.
    Not only this one. As correcting min offset is also affected, consumer 
client probably experiences long term of "commit log being deleted." before 
consuming progress catches up. There should be additional potential issues. 

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