[HBASE-16651] LRUBlockCache#returnBlock should try return block to Victim Handler L2 cache.

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.0
• Fix Version/s: 2.0.0
• Component/s: regionserver, Scanners
• Hadoop Flags: Reviewed
• Assignee: Anoop Sam John
• Reporter: Anoop Sam John
• Created: 18/Sep/16 17:21
• Updated: 17/Jun/22 05:26
• Resolved: 22/Sep/16 05:51

Description

In case of L1 and L2 cache usage with combinedMode = false, L2 is used as a victim handler cache for L1 cache. When a getBlock() request comes, L1 will see if block is in it and if not it will try to provide the block from L2 cache. In such a case, the return block must return the block to L2 cache and count down the ref count for the block. But right now we just ignore the returnBlock call in LRUCache