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From nickwallen <>
Subject [GitHub] incubator-metron pull request #226: METRON-377 Enable Profiles that Use Non-...
Date Tue, 23 Aug 2016 17:38:59 GMT
GitHub user nickwallen opened a pull request:

    METRON-377 Enable Profiles that Use Non-Single Pass Summary Functions

    ### [METRON-377](
    This pull request replaces #215 .
    As of METRON-372 , Profiles can be built using many statistical summaries that only require
a single-pass over the data.  This is less memory intensive and more scalable for high volume
    Unfortunately, not all functions can be calculated in a single pass.  In particular, the
skewness, ketosis and percentiles require all data to be stored in memory for the calculation
to occur.  The platform was enhanced so that a user can leverage skewness, ketosis and percentiles.

    ### Changes
    The `STATS_INIT` function was enhanced to accept a `window_size`.  This defines the number
of input data elements that are maintained in memory.  
    If the `window_size` is greater than 0, a rolling window of the most recent `window_size`
elements is maintained in memory.  The skewness, ketosis and percentiles are calculated over
this rolling window.  The `window_size` must be >0 otherwise these values cannot be calculated.
    If a user supplies a `window_size` equal to 0 then the more efficient implementation that
does not maintain a rolling window in memory is used.  Of course, in this case, the skewness,
ketosis, and percentiles cannot be calculated.
    The following additional functions were also added.
    Another integration test was added to validate this end-to-end also.

You can merge this pull request into a Git repository by running:

    $ git pull METRON-377-2

Alternatively you can review and apply these changes as the patch at:

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #226
commit f256fe7461a0a8273b0a9f9e2d10a01c7c53c473
Author: Nick Allen <>
Date:   2016-08-23T17:03:15Z

    METRON-372 Enhance Statistical Operations Available for Use with the Profiler

commit 37d7c3813b4c142fff351cc5b020393a97a5d4d2
Author: Nick Allen <>
Date:   2016-08-23T17:18:26Z

    METRON-377 Enable Profiles that Use Non-Single Pass Summary Functions

commit b6284ced44fd3f41945ad9e68267cd84b5aad782
Author: Nick Allen <>
Date:   2016-08-23T17:35:24Z

    METRON-377 Added an integration tests to use new stats functionality


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