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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-8866) SampleQuantiles#query is O(N^2) instead of O(N)
Date Sat, 29 Sep 2012 01:01:07 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-8866?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Aaron T. Myers updated HADOOP-8866:
-----------------------------------

       Resolution: Fixed
    Fix Version/s: 2.0.3-alpha
     Hadoop Flags: Reviewed
           Status: Resolved  (was: Patch Available)

I've just committed this to trunk and branch-2. Thanks a lot for the contribution, Andrew.
                
> 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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