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<== Date ==> <== Thread ==>

Subject: Re: Subscription / first update
From: Michael Davidsaver <mdavidsaver@gmail.com>
To: Andrew Johnson <anj@aps.anl.gov>, Ralph Lange <ralph.lange@gmx.de>, EPICS V4 Developers <epics-pvdata-devel@lists.sourceforge.net>
Cc: EPICS Core-Talk <core-talk@aps.anl.gov>
Date: Thu, 14 Jan 2016 13:14:08 -0500
On 01/14/2016 12:50 PM, Andrew Johnson wrote:
> My discomfort with per-client deadbands like this is that each client
> needs to know how big its deadband should be, and gets no hint at all
> from the record. With the existing IOC deadbands, the database designer
> can set 2 different deadband sizes for regular and archive monitors.

I'll second this.  For the archiver appliance, I ask for, and Murali
provided, a means of deadband filtering on the archiver (client) side. 
However, this is such a pain to configure that it wasn't get used much*.

* I still have hopes as this does allow for interesting policies like
retroactively applying a deadband to old data.  For example, keep full
data for 2 weeks, then decimate w/ deadband.


References:
Subscription / first update Ralph Lange
Re: Subscription / first update Andrew Johnson

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