[jira] [Commented] (HBASE-5347) GC free memory management in Level-1 Block Cache

["stack (Commented) (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-5347?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13202898#comment-13202898 ] 

stack commented on HBASE-5347:
------------------------------

Very nice idea (if the reference counting can be figured).
                
> GC free memory management in Level-1 Block Cache
> ------------------------------------------------
>
>                 Key: HBASE-5347
>                 URL: https://issues.apache.org/jira/browse/HBASE-5347
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Prakash Khemani
>            Assignee: Prakash Khemani
>
> On eviction of a block from the block-cache, instead of waiting for the garbage collecter to reuse its memory, reuse the block right away.
> This will require us to keep reference counts on the HFile blocks. Once we have the reference counts in place we can do our own simple blocks-out-of-slab allocation for the block-cache.
> This will help us with
> * reducing gc pressure, especially in the old generation
> * making it possible to have non-java-heap memory backing the HFile blocks

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