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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-11425) Cell/DBB end-to-end on the read-path
Date Fri, 16 Oct 2015 21:01:06 GMT

    [ https://issues.apache.org/jira/browse/HBASE-11425?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14961355#comment-14961355
] 

stack commented on HBASE-11425:
-------------------------------

My master branch is at this stage:

commit 1458798eb593358fe5415596b2958f2f7e451ea5
Author: stack <stack@apache.org>
Date:   Tue Oct 13 15:16:57 2015 -0700

    HBASE-14600 Make #testWalRollOnLowReplication looser still

> 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: 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, 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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