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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-8929) Add toString, other improvements for SampleQuantiles
Date Tue, 16 Oct 2012 05:55:05 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-8929?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Todd Lipcon updated HADOOP-8929:
--------------------------------

         Description: 
The new SampleQuantiles class is useful in the context of benchmarks, but currently there
is no way to print it out outside the context of a metrics sink. It would be nice to have
a convenient way to stringify it for logging, etc.

Also:
- made it Comparable and changed the HashMap to TreeMap so that the printout is in ascending
percentile order. Given that this map is always very small, and snapshot() is only called
once a minute or so, the runtime/memory differences between treemap and hashmap should be
negligible.
- changed the behavior to return null instead of throw, because all the catching, etc, got
pretty ugly. In implementing toString, I figured I'd clean up the other behavior along the
way.


  was:The new SampleQuantiles class is useful in the context of benchmarks, but currently
there is no way to print it out outside the context of a metrics sink. It would be nice to
have a convenient way to stringify it for logging, etc.

    Target Version/s: 2.0.2-alpha, 3.0.0  (was: 3.0.0, 2.0.2-alpha)
             Summary: Add toString, other improvements for SampleQuantiles  (was: Add toString
for SampleQuantiles)
    
> Add toString, other improvements for SampleQuantiles
> ----------------------------------------------------
>
>                 Key: HADOOP-8929
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8929
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: metrics
>    Affects Versions: 3.0.0, 2.0.2-alpha
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>         Attachments: hadoop-8929.txt
>
>
> The new SampleQuantiles class is useful in the context of benchmarks, but currently there
is no way to print it out outside the context of a metrics sink. It would be nice to have
a convenient way to stringify it for logging, etc.
> Also:
> - made it Comparable and changed the HashMap to TreeMap so that the printout is in ascending
percentile order. Given that this map is always very small, and snapshot() is only called
once a minute or so, the runtime/memory differences between treemap and hashmap should be
negligible.
> - changed the behavior to return null instead of throw, because all the catching, etc,
got pretty ugly. In implementing toString, I figured I'd clean up the other behavior along
the way.

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