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https://issues.apache.org/jira/browse/HBASE-27313?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17601778#comment-17601778
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Wellington Chevreuil commented on HBASE-27313:
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Had merged the PR into master branch. Tried cherry-picking it to branch-2, but 
there are some compilation failures for both TestPrefetchRSClose and 
TestPrefetchPersistence. TestPrefetchPersistence errors were easy to fix, just 
a name change on the HBaseTestUtil, but TestPrefetchRSClose seems to rely on 
some classes that don't exist nor have any equivalent in branch-2: 
SingleProcessHBaseCluster and StartTestingClusterOption. [[email protected]] 
, could you create a branch-2 compatible PR?

> Persist list of Hfiles names for which prefetch is done
> -------------------------------------------------------
>
>                 Key: HBASE-27313
>                 URL: https://issues.apache.org/jira/browse/HBASE-27313
>             Project: HBase
>          Issue Type: Improvement
>          Components: BucketCache
>    Affects Versions: 3.0.0-alpha-3
>            Reporter: Shanmukha Haripriya Kota
>            Assignee: Shanmukha Haripriya Kota
>            Priority: Major
>             Fix For: 3.0.0-alpha-4
>
>
> 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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