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https://issues.apache.org/jira/browse/HBASE-11425?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14391030#comment-14391030
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ramkrishna.s.vasudevan commented on HBASE-11425:
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Yes Stack. We have plans to split up the patch. But the most challenging part
is how to split it up and in what order?
Few tasks like Cell API changes, Ref Counting, MultiByteBuffer class can all be
added individually. But the rest are all inter wined. We can think of a
strategy to do it.
Thanks for having a look. We are parallel\y working on the review comments too.
> 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
> Attachments: HBASE-11425-E2E-NotComplete.patch, HBASE-11425.patch,
> Offheap reads in HBase using BBs_V2.pdf, Offheap reads in HBase using
> BBs_final.pdf
>
>
> 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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