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Subject: Re: EPICS R3.15.5 IOC crashes for DBR_CTRL_CHAR request with 1 array element
From: Ralph Lange <ralph.lange@gmx.de>
To: EPICS Core Talk <core-talk@aps.anl.gov>
Date: Fri, 7 Apr 2017 08:58:33 +0200
Hello Kay,

On Mon, Apr 3, 2017 at 4:08 PM, Kasemir, Kay <kasemirk@ornl.gov> wrote:

BTW, EDM, also starts PVs by first fetching the metadata.
For historic reasons it does that with only 1 array element because otherwise there were problems with either the CA client or CA server, don't remember.

That was detected as a deficiency of the PCAS/gdd server code, about 16 years ago: http://www.aps.anl.gov/epics/tech-talk/2000/msg00662.php
I don't think it was ever formally reported as a bug, though.

Nowadays (since ~5 years ago), clients should create a subscription with the DBE_PROPERTY flag and get notified about metadata changes.

Cheers,
~Ralph


References:
EPICS R3.15.5 IOC crashes for DBR_CTRL_CHAR request with 1 array element Kasemir, Kay
Re: EPICS R3.15.5 IOC crashes for DBR_CTRL_CHAR request with 1 array element Michael Davidsaver
Re: EPICS R3.15.5 IOC crashes for DBR_CTRL_CHAR request with 1 array element Michael Davidsaver
Re: EPICS R3.15.5 IOC crashes for DBR_CTRL_CHAR request with 1 array element Kasemir, Kay

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