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From "ramkrishna.s.vasudevan (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HBASE-11425) Cell/DBB end-to-end on the read-path
Date Thu, 28 Jan 2016 05:21:40 GMT

     [ https://issues.apache.org/jira/browse/HBASE-11425?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

ramkrishna.s.vasudevan resolved HBASE-11425.
      Resolution: Fixed
    Hadoop Flags: Reviewed

Moved out the Dictionary (HBASE-14841) and Prefix Tree (HBASE-14842) to work with ByteBuffer
to HBASE-15179 as it is mostly concerned with writes. Hence resolving this parent JIRA as

> 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, 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
> Will add subtasks under this.

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