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Date: Fri, 24 Jun 2011 02:21:47 +0000 (UTC)
From: "Jason Rutherglen (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
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Subject: [jira] [Commented] (HBASE-4027) Enable direct byte buffers
 LruBlockCache
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    [ https://issues.apache.org/jira/browse/HBASE-4027?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13054216#comment-13054216 ] 

Jason Rutherglen commented on HBASE-4027:
-----------------------------------------

Here's the relevant code from hadoop-lzo:

{code}
Object cleaner = buf.getClass().getMethod("cleaner").invoke(buf);
cleaner.getClass().getMethod("clean").invoke(cleaner);
{code}

and

{code}
ByteBuffer.allocateDirect(newSize);
{code}

> 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
>            Priority: Minor
>
> 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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