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https://issues.apache.org/jira/browse/HBASE-16651?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15502949#comment-15502949
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Anoop Sam John commented on HBASE-16651:
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And I agree with you - May be we should remove the combinedMode = false
version. Now we can have a combined mode L1 and off heap L2 cache. L1 will
have the index/bloom blocks (very less size is enough) and data in L2 cache.
No need to move around blocks btw L1 and L2. But still in case of combined
mode = true, we will need L2 as victim for L1? When L1 is out of space cache
them in L2. The blocks there are more frequently used ones
> 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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