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From "Andrew Wang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-3976) SampleQuantiles#query is O(N^2) instead of O(N)
Date Tue, 25 Sep 2012 22:42:08 GMT
Andrew Wang created HDFS-3976:
---------------------------------

             Summary: SampleQuantiles#query is O(N^2) instead of O(N)
                 Key: HDFS-3976
                 URL: https://issues.apache.org/jira/browse/HDFS-3976
             Project: Hadoop HDFS
          Issue Type: Improvement
    Affects Versions: 2.0.3-alpha
            Reporter: Andrew Wang
            Assignee: Andrew Wang
            Priority: Minor


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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