ramkrishna.s.vasudevan commented on HBASE-11425:

Atleast as far as I know the read path documentation is available as blog but 
not the write path related things. We may need to update and write about it I 
Will read this blog once again to know if the read path offheap is upto date or 
needs some update.

> 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
>    Affects Versions: 0.99.0
>            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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