[Responding in thread order]
On Thu, Sep 25, 2014 at 04:39:01PM +0200, Martin Bjorklund wrote:
> I think there might be a terminology confusion here, so let's do a
> simple example.
>
> list foo {
> key id;
> leaf id { type int32; }
> leaf a { type int32; }
> }
>
> local config:
>
> foo 42
>
> In ephemeral config we now do SET /foo[id=42]/a to 4711. Thus, in
> ephemeral we now have a single node (a) with value 4711.
Correct.
> What happens if we in local config delete foo 42?
The original set for the ephemeral datastore was for id=42, I'd expect the
GET to still return foo id=42 a=4711
> If /foo[id=42]/a is NOT deleted from the ephemeral config, what is now
> presented to the internal apps?
foo id=42 a=4711
A slightly different example:
local config: foo id=42 a=1
GET returns foo id=42 a=1
SET /foo[id=42]/a to 4711 in the ephemeral datastore.
GET returns foo id=42 a=4711
Two potential actions:
a) Delete /foo[id=42] in the ephemeral datastore.
GET returns id=42 a=1 (the underlying local config remains)
b) Delete /foo[id=42] in the local config
GET returns id=42 a=4711 (the overlay ephemeral config)
-----
In general, I'm not expecting the above type of behavior to be a common i2rs
operation where local config and ephemeral config overlap. When they do,
the above example shows ephemeral having priority over local config - but as
we discussed, that semantic may not always be the desired one.
What I find more likely is either:
foo id=42 a=1 # Datastore local config
foo id=43 a=4711 # Datastore ephemeral
No overlap.
Or alternatively:
list foo {
key id;
leaf id { type int32; }
leaf a { type int32; }
leaf i2rs:b { type int32; }
}
Where b is introduced either via augmentation from a separate module or
alternatively something like b is explicitly listed in the module defining
foo. In either case, b is noted to be an item that intended for the
ephemeral data store. This leads to the question:
SET foo id=42 a=1 # Datastore local config
SET foo id=42 b=4711 # epehemeral data store
GET foo returns id=42 a=1 b=4711
And then:
a) Delete foo id=42 in the local config
GET returns foo id=42 b=4711
b) Delete foo id=42 in the ephemeral datastore
GET returns foo id=42 a=1
-- Jeff
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