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From "Li Pi (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-4027) Enable direct byte buffers LruBlockCache
Date Tue, 19 Jul 2011 07:11:57 GMT

     [ https://issues.apache.org/jira/browse/HBASE-4027?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Li Pi updated HBASE-4027:
-------------------------

    Release Note: 
Allows the enabling off an off heap cache in hbase.  Set hbase.offheapcachesize in hbase-site.xml

Then, uncomment the line in hbase-env.sh. Cache does a slab allocation model similar to memcached.

          Status: Patch Available  (was: Open)

I'll do the writeup and pretty benchmarked graphs and stuff tomorrow. 

> Enable direct byte buffers LruBlockCache
> ----------------------------------------
>
>                 Key: HBASE-4027
>                 URL: https://issues.apache.org/jira/browse/HBASE-4027
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Jason Rutherglen
>            Assignee: Li Pi
>            Priority: Minor
>         Attachments: slabcachepatch.diff
>
>
> Java offers the creation of direct byte buffers which are allocated outside of the heap.
> They need to be manually free'd, which can be accomplished using an documented {{clean}}
method.
> The feature will be optional.  After implementing, we can benchmark for differences in
speed and garbage collection observances.

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