- **status**: accepted --> review
---
** [tickets:#1471] imm: Add attribute def flag SA_IMM_ATTR_DEFAULT_REMOVED**
**Status:** review
**Milestone:** 4.7.FC
**Created:** Tue Sep 08, 2015 07:07 AM UTC by Zoran Milinkovic
**Last Updated:** Tue Sep 08, 2015 07:17 AM UTC
**Owner:** Hung Nguyen
One way of allowing the removal of a default from an attribute as part of a
schema change,
To be done in a controlled way would be to introduce a new SA_IMM_ATTR flag.
We could name it SA_IMM_ATTR_DEFAULT_REMOVED.
An upgrade that intended to remove a default value would have to set this flag,
for this to be accepted.
The falg would be kept after the removal of the default.
When an object-create (ccb or rt) occurs on an attribute with this flag set and
no value is provided for the attribute, then
This would be allowed (since there is no default) but a LOG_Notice message
would be written to the syslog simply stating
that the attribute X has a removed default and the attribute will have the
empty value.
This is an improvement on simply allowing blind removal of a default.
It reduces the problem that some client (program or human) that is creating an
instance of that class and is “used to” relying
on a default value for some attribute in that class gets into trouble. Things
would not work as expected functionally with
or without this flag so there is still a potential backwards compatibility
problem, but at least now it is easy to spot/track down
why the problem occurred in the syslog.
In addition, simply forcing the class developer doing the default removal to
explicitly set this flag, increases the chances that
The class developer will actually read the documentation once (!) and actually
maybe give some actual thought to the
possible not intended effects of the removal of the default.
Its not a perfect solution.
But it is better than just silently allowing non backwards compatible changes.
---
Sent from sourceforge.net because opensaf-tickets@lists.sourceforge.net is
subscribed to https://sourceforge.net/p/opensaf/tickets/
To unsubscribe from further messages, a project admin can change settings at
https://sourceforge.net/p/opensaf/admin/tickets/options. Or, if this is a
mailing list, you can unsubscribe from the mailing list.
------------------------------------------------------------------------------
Monitor Your Dynamic Infrastructure at Any Scale With Datadog!
Get real-time metrics from all of your servers, apps and tools
in one place.
SourceForge users - Click here to start your Free Trial of Datadog now!
http://pubads.g.doubleclick.net/gampad/clk?id=241902991&iu=/4140
_______________________________________________
Opensaf-tickets mailing list
Opensaf-tickets@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/opensaf-tickets
