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From "Jimmy Xiang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8691) High-Throughput Streaming Scan API
Date Mon, 10 Jun 2013 17:54:23 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8691?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13679685#comment-13679685
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Jimmy Xiang commented on HBASE-8691:
------------------------------------

bq. and a performance loss using it on the server side.
We have considered prefetching in both the client side and the server side, and decided to
start with the server side.  HBASE-8420 handles server side prefetching (ported from 0.89,
but with some difference). Based on my testing using ycsb, it does have about 6.5% performance
gain.  If the client side spends more time with the results, the performance gain should be
more due to the parallelism. I was wondering how you got a performance loss, context switching?
                
> 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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