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 <imr...@rocketmail.com>
To: Dave Rawks <d...@pandora.com>; "ganglia-developers@lists.sourceforge.net"
<ganglia-developers@lists.sourceforge.net>
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 <d...@pandora.com>
To: ganglia-developers@lists.sourceforge.net
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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