sodonnel commented on pull request #1147:
URL: https://github.com/apache/hadoop-ozone/pull/1147#issuecomment-658687002


   > Thanks @bharatviswa504 and @adoroszlai for the review. lock per 
containerDBPath in ContainerCache is a good idea. I tried it but cannot solve 
our problem given a volume has nearly 20K containers, it still take nearly an 
hour for the datanode to finish the initialization.
   
   With a lock per containerPath, where does the bottle neck come from? Is it 
around the lock, or does a single thread load all the containers for a volume, 
and therefore its the time taken to init all the DB instances that is the 
bottleneck?


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