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https://issues.apache.org/jira/browse/HBASE-4027?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13064931#comment-13064931
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Li Pi commented on HBASE-4027:
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I have a copy based variant working right now, I'll submit the patch by the end
of this week for that. Benchmarks show roughly 75% of the speed of the existing
LruBlockCache, and around 4x the speed of FS cache reads. Realistically, we'll
be using a two stage cache solution, with the LruBlockCache also holding some
values, so for the majority of reads, it'll be the same speed as the
LruBlockCache.
Currently pursueing a 0 copy solution - going to need to make everything run
off ByteBuffers rather than byte[] though.
> 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
>
> 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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