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https://issues.apache.org/jira/browse/HBASE-9488?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13801519#comment-13801519
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Hudson commented on HBASE-9488:
-------------------------------
SUCCESS: Integrated in HBase-0.94-security #320 (See
[https://builds.apache.org/job/HBase-0.94-security/320/])
HBASE-9488 Improve performance for small scan (chunhui shen) (larsh: rev
1534494)
*
/hbase/branches/0.94/src/main/java/org/apache/hadoop/hbase/client/ClientScanner.java
*
/hbase/branches/0.94/src/main/java/org/apache/hadoop/hbase/client/ClientSmallScanner.java
* /hbase/branches/0.94/src/main/java/org/apache/hadoop/hbase/client/HTable.java
* /hbase/branches/0.94/src/main/java/org/apache/hadoop/hbase/client/Scan.java
*
/hbase/branches/0.94/src/main/java/org/apache/hadoop/hbase/client/ServerCallable.java
*
/hbase/branches/0.94/src/main/java/org/apache/hadoop/hbase/ipc/HRegionInterface.java
*
/hbase/branches/0.94/src/main/java/org/apache/hadoop/hbase/regionserver/HRegionServer.java
*
/hbase/branches/0.94/src/main/java/org/apache/hadoop/hbase/regionserver/Store.java
*
/hbase/branches/0.94/src/main/java/org/apache/hadoop/hbase/regionserver/StoreScanner.java
*
/hbase/branches/0.94/src/test/java/org/apache/hadoop/hbase/client/TestFromClientSide.java
> Improve performance for small scan
> ----------------------------------
>
> Key: HBASE-9488
> URL: https://issues.apache.org/jira/browse/HBASE-9488
> Project: HBase
> Issue Type: Improvement
> Components: Client, Performance, Scanners
> Reporter: chunhui shen
> Assignee: chunhui shen
> Fix For: 0.98.0, 0.96.0, 0.94.13
>
> Attachments: hbase-9488-94-v3.patch, HBASE-9488-trunk.patch,
> HBASE-9488-trunkV2.patch, HBASE-9488-trunkV3.patch, HBASE-9488-trunkV4.patch,
> HBASE-9488-trunkV4.patch, HBASE-9488-trunkV5.patch,
> mergeRpcCallForScan.patch, test results.jpg
>
>
> review board:
> https://reviews.apache.org/r/14059/
> *Performance Improvement*
> Test shows about 1.5~3X improvement for small scan where limit<=50 under
> cache hit ratio=100%.
> See more performance test result from the picture attachment
> *Usage:*
> Scan scan = new Scan(startRow,stopRow);
> scan.setSmall(true);
> ResultScanner scanner = table.getScanner(scan);
> Set the new 'small' attribute as true for scan object, others are the same
> Now, one scan operation would call 3 RPC at least:
> openScanner();
> next();
> closeScanner();
> I think we could reduce the RPC call to one for small scan to get better
> performance
> Also using pread is better than seek+read for small scan (For this point, see
> more on HBASE-7266)
> Implements such a small scan as the patch, and take the performance test as
> following:
> a.Environment：
> patched on 0.94 version
> one regionserver;
> one client with 50 concurrent threads;
> KV size:50/100;
> 100% LRU cache hit ratio;
> Random start row of scan
> b.Results:
> See the picture attachment
>
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