FrankChen021 commented on issue #11282:
URL: https://github.com/apache/druid/issues/11282#issuecomment-846348374


   @tazle Thanks for the testing. Indeed, a named volume works because the 
volume is created by docker and its permission is correctly setup, while the 
permission of a volume mapped to an absolute path on host is managed by the 
host OS.
   
   One disadvantage of a named volume is that its directory is managed by 
docker itself and usually is located at /var directory on the host, since data 
dir is used to store segments and task logs, its size might grow very fast to 
make the disk shortage. We have to document this.


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