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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8691) High-Throughput Streaming Scan API
Date Fri, 07 Jun 2013 00:10:21 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8691?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13677684#comment-13677684
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Lars Hofhansl commented on HBASE-8691:
--------------------------------------

I hacked up a patch for the first some time ago (still using HBase RPC, but keeping it going
via a 2nd thread in the ClientScanner).
Let me see whether I can find, but the principle is simple.
                
> High-Throughput Streaming Scan API
> ----------------------------------
>
>                 Key: HBASE-8691
>                 URL: https://issues.apache.org/jira/browse/HBASE-8691
>             Project: HBase
>          Issue Type: Improvement
>          Components: Scanners
>    Affects Versions: 0.95.0
>            Reporter: Sandy Pratt
>              Labels: perfomance, scan
>         Attachments: HRegionServlet.java, README.txt, RecordReceiver.java, ScannerTest.java,
StreamHRegionServer.java, StreamReceiverDirect.java, StreamServletDirect.java
>
>
> I've done some working testing various ways to refactor and optimize Scans in HBase,
and have found that performance can be dramatically increased by the addition of a streaming
scan API.  The attached code constitutes a proof of concept that shows performance increases
of almost 4x in some workloads.
> I'd appreciate testing, replication, and comments.  If the approach seems viable, I think
such an API should be built into some future version of HBase.

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