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https://issues.apache.org/jira/browse/HBASE-23296?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16980043#comment-16980043
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chenxu commented on HBASE-23296:
--------------------------------

A initial patch and an simple design doc was attached.

> Add CompositeBucketCache to support tiered BC
> ---------------------------------------------
>
>                 Key: HBASE-23296
>                 URL: https://issues.apache.org/jira/browse/HBASE-23296
>             Project: HBase
>          Issue Type: New Feature
>          Components: BlockCache
>            Reporter: chenxu
>            Assignee: chenxu
>            Priority: Major
>
> LruBlockCache is not suitable in the following scenarios:
> (1) cache size too large (will take too much heap memory, and 
> evictBlocksByHfileName is not so efficient, as HBASE-23277 mentioned)
> (2) block evicted frequently, especially cacheOnWrite & prefetchOnOpen are 
> enabled.
> Since block‘s data is reclaimed by GC, this may affect GC performance.
> So how about enabling a Bucket based L1 Cache.



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