Re: [Ganglia-developers] Protocol Efficiency Ideas

[Vladimir V. <vl...@ve...>]

I don't get it. JSON is a notation that has nothing to do with Linux.

I think addition of JSON will be fantastic and look forward to including 
it.

Vladimir

On Fri, 27 Jan 2012, Im Root wrote:

> I forgot to add that by adding json, you will be restricting the types of Linux that this platform runs on. Although
> it may be a "nice to have" feature for a few developers who may want to customize things, this puts an additional
> dependency on the platform. You will be restricted to using only the flavors of linux that the keepers of json feel
> like using. Sorry, but adding the json dependency is a completely boneheaded move.
> 
> ____________________________________________________________________________________________________________________
> From: Im Root <im...@ro...>
> To: Dave Rawks <da...@pa...>; "gan...@li..."
> <gan...@li...>
> Sent: Friday, January 27, 2012 9:59 AM
> Subject: Re: [Ganglia-developers] Protocol Efficiency Ideas
> 
> I believe that adding json would be a mistake. The reason is that when users install the main package there would be
> now a dependency on having json installed. It just adds to the complexity and helps to perpetuate RPM hell. I've had
> to deal with installing json in the past and it's been awful. It may be nice for a developer but not so nice for the
> end users.
> 
> ____________________________________________________________________________________________________________________
> From: Dave Rawks <da...@pa...>
> To: gan...@li...
> Sent: Thursday, January 26, 2012 2:34 PM
> Subject: [Ganglia-developers] Protocol Efficiency Ideas
> 
> Hey All,
>     We've been talking about adding json in addition to xml for the tcp
> listen port exchange format. And I was curious if the "EXTRA_DATA"
> subtree to the XML ever contains something aside from "EXTRA_ELEMENTS"
> and if the "EXTRA_ELEMENTS" ever have attributes aside from "NAME" and
> "VAL".
> 
> Just doing some back of napkin calculations it looks like reducing this
> portion of the xml from:
> 
> <METRIC NAME="swap_free" VAL="47872928" TYPE="float" UNITS="KB" TN="24"
> TMAX="180" DMAX="0" SLOPE="both">
> <EXTRA_DATA>
> <EXTRA_ELEMENT NAME="GROUP" VAL="memory"/>
> <EXTRA_ELEMENT NAME="DESC" VAL="Amount of available swap memory"/>
> <EXTRA_ELEMENT NAME="TITLE" VAL="Free Swap Space"/>
> </EXTRA_DATA>
> </METRIC>
> 
> to:
> 
> <METRIC NAME="swap_free" VAL="47872928" TYPE="float" UNITS="KB" TN="24"
> TMAX="180" DMAX="0" SLOPE="both">
> <EXTRA_DATA GROUP="memory" DESC="Amount of available swap memory"
> TITLE="Free Swap Space"/>
> </METRIC>
> 
> would be quite a savings over the wire. Of course this would break
> compatibility with anything that currently exchanges xml with ganglia
> monitor. But... That gets me back to json...
> 
> The current data structure from xml to json is something like this:
> 
> {metric:{name:'swap_free',val:47872928,type:'float',units:'KB',tn:24,tmax:180,dmax:0,slope:'both',extra_data:{extra
> _element:[{name:'GROUP',val:'memory'},{name:'DESC',val:'Amount
> of available swap memory'},{name:'TITLE',val:'Free Swap Space'}]}}}
> 
> While the collapsed version ends up being this tiny json blob:
> 
> {metric:{name:'swap_free',val:47872928,type:'float',units:'KB',tn:24,tmax:180,dmax:0,slope:'both',extra_data:{group
> :'memory',desc:'Amount
> of available swap memory',title:'Free Swap Space'}}}
> 
> 
> On a relatively small cluster with a dozen metrics and a handful of
> hosts the savings are minor. However on a cluster of hundreds of hosts
> with perhaps dozens of metrics the savings would equate to MBs of data
> per tcp fetch. And the parse speed of the json /should/ be much faster
> as well.
> 
> Any comments/questions/ideas?
> 
> -Dave
> 
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