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https://issues.apache.org/jira/browse/HBASE-6874?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13667011#comment-13667011
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Hudson commented on HBASE-6874:
-------------------------------
Integrated in HBase-TRUNK-on-Hadoop-2.0.0 #542 (See
[https://builds.apache.org/job/HBase-TRUNK-on-Hadoop-2.0.0/542/])
HBASE-8420 Port HBASE-6874 Implement prefetching for scanners from 0.89-fb
(Revision 1486246)
Result = FAILURE
jxiang :
Files :
*
/hbase/trunk/hbase-client/src/main/java/org/apache/hadoop/hbase/client/ClientScanner.java
*
/hbase/trunk/hbase-client/src/main/java/org/apache/hadoop/hbase/client/Scan.java
*
/hbase/trunk/hbase-client/src/main/java/org/apache/hadoop/hbase/client/ScannerCallable.java
*
/hbase/trunk/hbase-client/src/main/java/org/apache/hadoop/hbase/protobuf/ProtobufUtil.java
*
/hbase/trunk/hbase-common/src/main/java/org/apache/hadoop/hbase/util/Threads.java
*
/hbase/trunk/hbase-protocol/src/main/java/org/apache/hadoop/hbase/protobuf/generated/ClientProtos.java
* /hbase/trunk/hbase-protocol/src/main/protobuf/Client.proto
*
/hbase/trunk/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java
*
/hbase/trunk/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegionServer.java
*
/hbase/trunk/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/RegionScannerHolder.java
*
/hbase/trunk/hbase-server/src/test/java/org/apache/hadoop/hbase/client/TestScannersFromClientSide.java
*
/hbase/trunk/hbase-server/src/test/java/org/apache/hadoop/hbase/coprocessor/TestRowProcessorEndpoint.java
*
/hbase/trunk/hbase-server/src/test/java/org/apache/hadoop/hbase/protobuf/TestProtobufUtil.java
*
/hbase/trunk/hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestRegionServerMetrics.java
> Implement prefetching for scanners
> ----------------------------------
>
> Key: HBASE-6874
> URL: https://issues.apache.org/jira/browse/HBASE-6874
> Project: HBase
> Issue Type: Sub-task
> Reporter: Karthik Ranganathan
> Assignee: Karthik Ranganathan
> Fix For: 0.89-fb
>
>
> I did some quick experiments by scanning data that should be completely in
> memory and found that adding pre-fetching increases the throughput by about
> 50% from 26MB/s to 39MB/s.
> The idea is to perform the next in a background thread, and keep the result
> ready. When the scanner's next comes in, return the pre-computed result and
> issue another background read.
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