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From "Anoop Sam John (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-16651) LRUBlockCache#returnBlock should try return block to Victim Handler L2 cache.
Date Mon, 19 Sep 2016 15:27:20 GMT

    [ https://issues.apache.org/jira/browse/HBASE-16651?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15503764#comment-15503764
] 

Anoop Sam John commented on HBASE-16651:
----------------------------------------

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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