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https://issues.apache.org/jira/browse/HBASE-11425?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16398935#comment-16398935
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Anoop Sam John commented on HBASE-11425:
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Nothing new very specific to the off heaping as such. We have the hit ratio
etc at BC layer. We don't have any metric at the BBPool layer. That may be not
needed too I believe.
> Cell/DBB end-to-end on the read-path
> ------------------------------------
>
> Key: HBASE-11425
> URL: https://issues.apache.org/jira/browse/HBASE-11425
> Project: HBase
> Issue Type: Umbrella
> Components: regionserver, Scanners
> Reporter: Anoop Sam John
> Assignee: Anoop Sam John
> Priority: Major
> Fix For: 2.0.0
>
> Attachments: BenchmarkTestCode.zip, Benchmarks_Tests.docx, GC pics
> with evictions_4G heap.png, HBASE-11425-E2E-NotComplete.patch,
> HBASE-11425.patch, Offheap reads in HBase using BBs_V2.pdf, Offheap reads in
> HBase using BBs_final.pdf, Screen Shot 2015-10-16 at 5.13.22 PM.png, gc.png,
> gets.png, heap.png, load.png, median.png, ram.log
>
>
> Umbrella jira to make sure we can have blocks cached in offheap backed cache.
> In the entire read path, we can refer to this offheap buffer and avoid onheap
> copying.
> The high level items I can identify as of now are
> 1. Avoid the array() call on BB in read path.. (This is there in many
> classes. We can handle class by class)
> 2. Support Buffer based getter APIs in cell. In read path we will create a
> new Cell with backed by BB. Will need in CellComparator, Filter (like SCVF),
> CPs etc.
> 3. Avoid KeyValue.ensureKeyValue() calls in read path - This make byte copy.
> 4. Remove all CP hooks (which are already deprecated) which deal with KVs.
> (In read path)
> Will add subtasks under this.
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