On Thu, Sep 4, 2014 at 8:29 AM, Jeffrey Haas <[email protected]> wrote: > On Tue, Sep 02, 2014 at 11:00:05AM -0700, Andy Bierman wrote: > > On Tue, Sep 2, 2014 at 10:50 AM, Reinaldo Penno <[email protected]> > wrote: > > > are we taking this approach only for I2RS or this will be our preferred > > > solution from now on? > > > > > > Meaning, every time when a new protocol/WG has certain valid > requirements > > > we will create a new datastore for them? > > > > > Good question. > > It is a lot more work to add a new datastore than to tag data as > ephemeral > > in the existing "running" datastore -- if the only difference is no > > non-volatile support. > > I think the I2RS WG has to agree on those details first. > > Part of the discussion at the recent netmod session and post-session > hallway > discussion provided some suggestion there may be other users desiring > ephemeral characteristics. If this is the case, providing for a mechanism > for tagging ephemeral state seems to be generally useful. > > One of the open questions for the more general mechanism is whether > ephemeral state should be in a separate data store. While I think there is > good cause for I2RS to desire this, from the general standpoint it may also > simplify implementations to keep ephemeral configuration segregated from > static configuration. > > It makes a big difference to YANG XPath whether there is a separate datastore. YANG only supports 1 static context for each document type (rpc/input, rpc/output, config-data, all-data, notification). A new datastore might require many changes to YANG, depending on I2RS requirements.
There are problems mixing local config and I2RS nodes in "must" or "when" expressions. One important detail is whether I2RS objects are config=true (or false) in YANG. This impacts how must, when, and other constructs will behave. If I2RS is config=false, It should be OK to reference local config from I2RS must/when stmts, but a config object must/when statement is not allowed to reference an I2RS object. Is this OK? Are there any requirements for "YANG integration" between the local config and the I2RS datastore? -- Jeff > Andy
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