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From nickwallen <>
Subject [GitHub] incubator-metron pull request #214: METRON-372 Enhance Statistical Operation...
Date Tue, 16 Aug 2016 20:32:43 GMT
GitHub user nickwallen opened a pull request:

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

    ### [METRON-372](
    Only basic math functions are currently available in Stellar for use with the Profiler.
 This makes life difficult for users to create even basic profiles like a running average.
    This can be seen in the following example where the average must be calculated manually
in Stellar.  A variable `sum` and `cnt` must be maintained and then used to calculate the
      "profile": "example3",
      "foreach": "ip_src_addr",
      "onlyif": "protocol == 'HTTP'",
      "init": {
        "sum": 0.0,
        "cnt": 0.0
      "update": {
        "sum": "sum + resp_body_len",
        "cnt": "cnt + 1"
      "result": "sum / cnt"
    This change introduces a series of summary functions that make creating profiles much
simpler for the user.  Instead of re-implementing the calculation of an average in Stellar,
this leverages Commons Math to perform all the heavy lifting.
    The example above for calculating an average can be re-defined as follows.
      "profile": "example3",
      "foreach": "ip_src_addr",
      "onlyif": "protocol == 'HTTP'",
      "init":   { "s": "STATS_INIT(0)" },
      "update": { "_": "STATS_ADD(length, s)" },
      "result": "STATS_MEAN(s)"
    The following summary functions are supported.  These are all statistics that can be calculated
in a single pass.  This means that none of the values being summarized are stored in memory.
    * count
    * mean
    * geometric mean
    * max
    * min
    * sum
    * population variance
    * variance
    * second moment
    * quadratic mean
    * standard deviation
    * sum of logs
    * sum of squares.
    Note: This change depends on METRON-309.

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

    $ git pull METRON-372

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 #214
commit 11ef29bb73c8363b1c905f597be496929b77888f
Author: Nick Allen <>
Date:   2016-07-29T20:53:49Z

    METRON-309 Create a normalcy profiler

commit 28560b36273271c438c3309df610a4c4306ffdde
Author: Nick Allen <>
Date:   2016-08-11T20:46:00Z

    METRON-309 Corrected a typo in the 'Getting Started' instructions

commit d55d32efeea38f52bd9d1095aa6f8817bc15f0a5
Author: Nick Allen <>
Date:   2016-08-12T13:16:19Z

    METRON-309 Altered based on Stellar Unification changes

commit ca81339e0f326dc04110eafd74fd0879dfe1a029
Author: Nick Allen <>
Date:   2016-08-12T13:23:06Z

    METRON-309 Need to set the kafka broker in the Profiler topology properties

commit 712a1083c21eb8f7c0d81511d432c054792ebe9b
Author: Nick Allen <>
Date:   2016-08-12T15:17:47Z

    METRON-309 Updated examples to use latest Stellar binary functions

commit 01aa1f972324f97b231b7d9a26f122891a1b6d50
Author: Nick Allen <>
Date:   2016-08-15T18:03:49Z

    METRON-309 Fixed the README examples and added each as an integration test.

commit d9e2c5e568292c4a08c6c6c314d3c2e8a9ea38be
Author: Nick Allen <>
Date:   2016-08-15T20:08:26Z

    METRON-367 Enhance Profiler to Support Multiple Numeric Types

commit b9366ff97dbc8968ac44a2ba8dfe7bca43e7adc6
Author: Nick Allen <>
Date:   2016-08-15T20:32:51Z

    METRON-368 Simplify Profile Configuration with Sensible Defaults

commit 486e8138efbc64342b0bcf405adae521c55d4e33
Author: Nick Allen <>
Date:   2016-08-16T16:51:07Z

    METRON-309 Removed legacy classes from Stellar Unification that are no longer needed

commit c3ce806606c0903fd62819e4a29ea91adb1979be
Author: Nick Allen <>
Date:   2016-08-16T16:34:26Z

    METRON-372 Refactored the Stellar functions for clarity

commit eaf5255143d7c09ee8735d3c7d4fa34a58c25831
Author: Nick Allen <>
Date:   2016-08-16T19:49:13Z

    METRON-372 Added summary statistics functions to Stellar

commit 06118874b28deaf62fb4b454672c6bce21ea39ee
Author: Nick Allen <>
Date:   2016-08-16T20:01:13Z

    METRON-372 Updated example to show use of new STATS_x functions


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