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From "stack (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5347) GC free memory management in Level-1 Block Cache
Date Mon, 12 Mar 2012 18:28:37 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5347?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13227744#comment-13227744
] 

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

bq. We are not actively pursuing this approach anymore due to non-reproducibility of GC issues.

That sounds interesting.  Was it that there was no discernible difference seen in GC managing
the allocations ourselves?  Would love to hear more if there are lessons to be had Mikhail
(and Prakash).  Good on you lads.
                
> 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
>         Attachments: D1635.5.patch
>
>
> 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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