AnonHxy opened a new pull request, #3989:
URL: https://github.com/apache/bookkeeper/pull/3989

   Descriptions of the changes in this PR:
   
   
   
   ### Motivation
   
   Improve remove performance  of `LedgerMetadataIndex#pendingDeletedLedgers`.
   
   Currently the `pendingDeletedLedgers` is a `ConcurrentLinkedQueue`,  and we 
just call `remove` and `add` and `poll` method of this queue.  And it seems 
that we need not keep the order when poll items from it. 
   
   Removing items from  `ConcurrentLinkedQueue` need traversal the queue. 
Changing the `LedgerMetadataIndex#pendingDeletedLedgers` as a 
`ConcurrentHashSet` will improve the remove performance.
   
   ### Changes
   
   Changing the `LedgerMetadataIndex#pendingDeletedLedgers` as a 
`ConcurrentHashSet`
   
   


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