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Date: Sat, 29 Sep 2012 11:59:07 +1100 (NCT)
From: "Aaron T. Myers (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
Message-ID: <1113141949.141935.1348880347865.JavaMail.jiratomcat@arcas>
Subject: [jira] [Moved] (HADOOP-8866) SampleQuantiles#query is O(N^2)
 instead of O(N)
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     [ https://issues.apache.org/jira/browse/HADOOP-8866?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Aaron T. Myers moved HDFS-3976 to HADOOP-8866:
----------------------------------------------

     Target Version/s: 2.0.3-alpha  (was: 2.0.3-alpha)
    Affects Version/s:     (was: 2.0.3-alpha)
                       2.0.2-alpha
                  Key: HADOOP-8866  (was: HDFS-3976)
              Project: Hadoop Common  (was: Hadoop HDFS)
    
> 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
>         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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