[HBASE-23296] Add CompositeBucketCache to support tiered BC

• Type: New Feature
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: BlockCache
• Assignee: chenxu
• Reporter: chenxu
• Created: 15/Nov/19 03:29
• Updated: 15/Mar/21 22:24

Description

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.

Issue Links

• links to: design doc
• links to: GitHub Pull Request #868