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[mmrobins <question215601@xxxxxxxxxxxxxxxxxxxxx>]

Question #215601 on Graphite changed:
https://answers.launchpad.net/graphite/+question/215601

Description changed to:
I think I might be misunderstanding how diffSeries works.  I'm getting
different results depending on whether I summarize my arguments before
doing diffSeries or not.

I expect the following two graphite queries to return the same numbers,
but they don't.  The one with the summarization inside diffSeries seems
to be the correct numbers based on taking summarizations of every
individual metrics and manually summing them as I intend, but I'd rather
have the summarize on the outside since it's slightly shorter and makes
changing the interval programmatically easier in a program that's
generating these sorts of queries to go in the target parameter of the
url.

    summarize(
      diffSeries(
        sum(
          stats_counts.otherthing.one,
          stats_counts.otherthing.two
        ),
        sum(
          stats_counts.thing.one,
          stats_counts.thing.two,
          stats_counts.thing.three
        )
      ),
      '1week',
      'sum',
      true
    )

    diffSeries(
      summarize(
        sum(
          stats_counts.otherthing.one,
          stats_counts.otherthing.more_than_five
        ),
        '1week',
        'sum',
        true
      ),
      summarize(
        sum(
          stats_counts.thing.one,
          stats_counts.thing.two,
          stats_counts.thing.three,
        ),
        '1week',
        'sum',
        true
      )
    )

Any insight as to why these would give different results?  I can post
raw csv data for anything if that helps.

Thanks

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