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Posted to common-issues@hadoop.apache.org by "Hudson (JIRA)" <ji...@apache.org> on 2012/09/29 03:07:08 UTC
[jira] [Commented] (HADOOP-8866) SampleQuantiles#query is O(N^2)
instead of O(N)
[ https://issues.apache.org/jira/browse/HADOOP-8866?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13466061#comment-13466061 ]
Hudson commented on HADOOP-8866:
--------------------------------
Integrated in Hadoop-Mapreduce-trunk-Commit #2809 (See [https://builds.apache.org/job/Hadoop-Mapreduce-trunk-Commit/2809/])
HADOOP-8866. SampleQuantiles#query is O(N^2) instead of O(N). Contributed by Andrew Wang. (Revision 1391711)
Result = FAILURE
atm : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1391711
Files :
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/CHANGES.txt
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/metrics2/util/SampleQuantiles.java
> SampleQuantiles#query is O(N^2) instead of O(N)
> -----------------------------------------------
>
> Key: HADOOP-8866
> URL: https://issues.apache.org/jira/browse/HADOOP-8866
> Project: Hadoop Common
> Issue Type: Improvement
> Affects Versions: 2.0.2-alpha
> Reporter: Andrew Wang
> Assignee: Andrew Wang
> Priority: Minor
> Fix For: 2.0.3-alpha
>
> Attachments: hdfs-3976-1.patch
>
>
> SampleQuantiles#query() does O(N) calls LinkedList#get() in a loop, rather than using an iterator. This makes query O(N^2), rather than O(N).
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