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From "Vladimir Rodionov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12031) Parallel Scanners inside Region
Date Mon, 22 Sep 2014 23:26:34 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12031?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14144021#comment-14144021

Vladimir Rodionov commented on HBASE-12031:

in your tests - out of curiosity - what happens when you force compaction into always using

I have not tried that as since implementation still use streaming reads when possible, but
if we disable streaming reads and will use preads with read ahead, we will see some performance
degradation, of course. Streaming reads are still more efficient than preads with read aheads.

> Parallel Scanners inside Region
> -------------------------------
>                 Key: HBASE-12031
>                 URL: https://issues.apache.org/jira/browse/HBASE-12031
>             Project: HBase
>          Issue Type: New Feature
>          Components: Performance, Scanners
>    Affects Versions: 0.98.6
>            Reporter: Vladimir Rodionov
>            Assignee: Vladimir Rodionov
>             Fix For: 1.0.0, 2.0.0, 0.98.7, 0.99.1
>         Attachments: HBASE-12031.2.patch, HBASE-12031.patch, ParallelScannerDesign.pdf,
> This JIRA to improve performance of multiple scanners running on a same region in parallel.
The scenarios where we will get the performance benefits:
> * New TableInputFormat with input splits smaller than HBase Region.
> * Scanning during compaction (Compaction scanner and application scanner over the same
> Some JIRAs related to this one:
> https://issues.apache.org/jira/browse/HBASE-7336
> https://issues.apache.org/jira/browse/HBASE-5979 

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