[jira] [Commented] (HBASE-23296) Add CompositeBucketCache to support tiered BC

["Guanghao Zhang (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-23296?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17120804#comment-17120804 ] 

Guanghao Zhang commented on HBASE-23296:
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{quote}yes, we need a bigger L1, it's not suitable to keep it on the heap
{quote}
So use offheap as L1 and file as L2? Why don't use heap as L1, because gc problem?

> 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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