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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4027) Enable direct byte buffers LruBlockCache
Date Tue, 19 Jul 2011 21:38:58 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4027?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13067992#comment-13067992
] 

Ted Yu commented on HBASE-4027:
-------------------------------

Why is the handling below different from that in cacheBlock(String blockName, ByteBuffer buf,
boolean inMemory) ?
{code}
  public void cacheBlock(String blockName, ByteBuffer buf) {
    // onHeapCache.cacheBlock(blockName, buf);
{code}

Overall, more javadoc would help others grasp the functionality for each class.

> 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, slabcachepatchv2.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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