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From Abraham Elmahrek <>
Subject Re: htrace gui meeting minutes
Date Sat, 04 Apr 2015 02:10:34 GMT
Thanks for putting this together Colin. It was really useful!

On Fri, Apr 3, 2015 at 6:57 PM, Colin P. McCabe <> wrote:

> We had: Abe, Colin, May, Masatake in attendance.
> We talked about more closely integrating the search page with the
> swimlanes view.  In particular, would it be possible to have them be
> one view?  Maybe.  We need zoom buttons, time delineation bars, and
> some other minor features in the swimlanes view.   We talked about
> having parent/child relationships shown on this view.
> Pagination has been a trouble spot for the search page.  We need to
> use entire spans as continuation tokens, and correctly handle cases
> where we are sorting by a key other than span id.  It would be nice if
> the web UI could fetch 4 pages worth of results, in order to give the
> user an idea of whether there were many results, or only a few.  This
> may be difficult to do with backgrid.js.
> It would also be nice to be able to click on a span in the view to see
> its children (May's suggestion).  This may also be difficult with
> backgrid, but it would be really cool.
> We talked about having tabs to move between different activities.  The
> ones discussed were server info, configuration, search, and
> aggregrates.
> server info: The server info tab must contain an owl.  We already have
> a serverinfo JSON RPC, so this could be used.  We might also want
> server stats on this page eventually.
> configuration: It would be nice to have the configuration page
> accessible via /conf, for familiarity to hadoop admins.  This would
> show the htraced configuration.
> aggregates: this view would provide all the same predicates as the
> search view, but would allow users to choose an aggregate from a
> drop-down list.  Examples include: average, median, std deviation,
> max, min, count.  We also would want a bucket size.  One really great
> example is taking the sum of the number of spans within each 10 minute
> interval in the last 24 hours, to see activity spikes.  We may need to
> think about whether this puts too much load on the server.  if so,
> we'd have to precompute a few aggregates, or do this outside htraced.
> The histogram view is a later target than the other views.
> best,
> Colin

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