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From "ramkrishna.s.vasudevan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-11425) Cell/DBB end-to-end on the read-path
Date Wed, 25 Mar 2015 16:42:54 GMT

    [ https://issues.apache.org/jira/browse/HBASE-11425?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14380193#comment-14380193
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ramkrishna.s.vasudevan commented on HBASE-11425:
------------------------------------------------

Any comments/suggestions on the E2E patch attached.  We are working on refining the patch
such that some more cases where we need to clearly distinguish the getXXXArray and getXXXBB
methods.  Suggestions on the above patch would help us greatly.

> 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, 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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