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Posted to common-dev@hadoop.apache.org by "Hadoop QA (JIRA)" <ji...@apache.org> on 2008/01/30 02:49:34 UTC
[jira] Commented: (HADOOP-287) Speed up SequenceFile sort with
memory reduction
[ https://issues.apache.org/jira/browse/HADOOP-287?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12563794#action_12563794 ]
Hadoop QA commented on HADOOP-287:
----------------------------------
-1 overall. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12374300/287-0.patch
against trunk revision 615723.
@author +1. The patch does not contain any @author tags.
javadoc +1. The javadoc tool did not generate any warning messages.
javac +1. The applied patch does not generate any new javac compiler warnings.
release audit +1. The applied patch does not generate any new release audit warnings.
findbugs -1. The patch appears to introduce 2 new Findbugs warnings.
core tests +1. The patch passed core unit tests.
contrib tests +1. The patch passed contrib unit tests.
Test results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/1703/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/1703/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/1703/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/1703/console
This message is automatically generated.
> Speed up SequenceFile sort with memory reduction
> ------------------------------------------------
>
> Key: HADOOP-287
> URL: https://issues.apache.org/jira/browse/HADOOP-287
> Project: Hadoop Core
> Issue Type: Improvement
> Components: io
> Affects Versions: 0.17.0
> Reporter: Benjamin Reed
> Assignee: Doug Cutting
> Attachments: 287-0.patch, s.patch, zoom-sort.patch, zoom-sort.patch
>
>
> I replaced the merge sort with a quick sort and it yielded approx 30% improvement in sort time. It also reduced the memory requirement for sorting because the sort is done in place.
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