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From Colin McCabe <>
Subject Re: Seeing Spans in HTraced
Date Tue, 17 May 2016 03:35:29 GMT
Hi Lewis,

Thanks for trying this out.  The htraced buffer gets flushed after a
configurable amount of time.  It's also flushed if the SpanReceiver gets
shut down (like in a short lived command line program.). So I don't
think we should change the buffer size default.  Maybe we could document
this better, and/or change the buffer flush time default.


On Mon, May 16, 2016, at 19:34, Lewis John Mcgibbney wrote:
> Hi Folks,
> For test and development and also for new comers coming to HTrace I am
> not
> sure if it is realistic for such a high default buffer to be set for
> Htraced. Right now is appears that the default value is 16,777,216 bytes
> which is pretty large if one wishes to get a feel for the HTrace
> framework
> generally and HTraced specifically.
> Although I am easily able to work programmatically and hence change this
> default buffer value to anything I want. Everyone else may not be that
> way
> inclined and may instead just wish to, fr example, run the Docker image
> and
> see what HTrace actually does.
> Does anyone else have an opinion on this? My perspective from being
> @ApacheCon last week and from doing my HTrac'ing in Nutch presentation is
> that people just want to see what HTrac'ing looks like. They may not have
> an application which writes 16MB of spans to a buffer out of the box.
> Thanks
> Lewis
> -- 
> *Lewis*

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