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https://issues.apache.org/jira/browse/HBASE-23296?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17116670#comment-17116670
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chenxu commented on HBASE-23296:
--------------------------------
{quote}So when user config L1 and L2 tiers at the BucketCache level, the on
heap LRU cache will not get used at all?
{quote}
yes as you said.
{quote}We can say all these clearly in the doc pls.
{quote}
OK, will improve the doc soon
> 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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