Kota-SH opened a new pull request, #4771:
URL: https://github.com/apache/hbase/pull/4771

   Jira link: https://issues.apache.org/jira/browse/HBASE-27313
   
   Note:
   A patch has already been merged into master, this PR is for branch-2.
   
   Summary:
   Persist list of Hfiles names for which prefetch is completed when persist 
for in-memory bucket cache mapping state is enabled.
   
   We need to persist the Set, which contains a list of all the HFiles for 
which the prefetch has completed along with the In-memory state of the bucket 
cache so that when we restart and if any prefetch is scheduled again for the 
same HFile and we already have the in-memory state retrieved, we can skip the 
prefetch for it.


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