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https://issues.apache.org/jira/browse/HBASE-16651?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15503764#comment-15503764
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Anoop Sam John commented on HBASE-16651:
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Ya we will need CombinedCache but L2 should be made L1's victim then also. Now
also same happens any way.
> LRUBlockCache#returnBlock should try return block to Victim Handler L2 cache.
> -----------------------------------------------------------------------------
>
> Key: HBASE-16651
> URL: https://issues.apache.org/jira/browse/HBASE-16651
> Project: HBase
> Issue Type: Sub-task
> Components: regionserver, Scanners
> Affects Versions: 2.0.0
> Reporter: Anoop Sam John
> Assignee: Anoop Sam John
> Fix For: 2.0.0
>
> Attachments: HBASE-16651.patch
>
>
> 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
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