Thanks Alex, all,
I'd just finished implementing the basic "boolean disabled"
functionality [1].
Yes, disabled is stronger than deprecated.
Enumeration: interesting suggestion. Not sure - hard to know what if any
other states we'd add, and whether there's any use-case for setting as
both deprecated + disabled.
I am tempted to change to an enumeration, even though I don't want to
have to do more work on it right now!
Thoughts?
"Replacement" field (as GCE have). Nice idea. Can be added
separately/later, I think. Normally it's because there is a newer
version of the blueprint that should be used instead, which is fairly
self evident. But I'm sure it would be useful in other situations.
Aled
[1] https://github.com/apache/incubator-brooklyn/pull/850 (but needs
rebased against master for package renames)
On 19/08/2015 14:36, Alex Heneveld wrote:
+1 to the idea of "disabled"
Presumably disabled is stronger than deprecated. Do we want both as
booleans or an enum e.g. "availability" ?
Could be nice to have a "replacement" field (which can be set to refer
to a catalog item to use instead) and perhaps an availability_comment
(free-form text on why something is deprecated/disabled)... just some
thoughts.
--A
On 19/08/2015 14:20, Andrea Turli wrote:
Hi Aled,
not different, simply I was wondering if a schema like the one used
in GCE
{
"state": string,
"replacement": string,
"deprecated": string,
"obsolete": string,
"deleted": string
}
could have been of any help.
Seems like `disabled` is similar to `obsolete` so your proposal is in
line
with GCE approach, I think.
My two cents,
Andrea
On Wed, 19 Aug 2015 at 15:06 Aled Sage <[email protected]> wrote:
Hi Andrea,
We are attaching metadata to the persisted catalog item. One can
explicitly set "deprecated" on a catalog item, and the proposal is to
add support for "disabled".
Is the GCE metadata a different approach from this?
Aled
On 19/08/2015 13:02, Andrea Turli wrote:
Aled,
interesting problem!
I don't want to confuse things, but this reminds me of something I've
seen
before. Could metadata attached to the blueprint be an idea, like
they do
for images at GCE [1]?
Best,
Andrea
[1]:
https://cloud.google.com/compute/docs/reference/latest/images/deprecate
On Wed, 19 Aug 2015 at 12:11 Alasdair Hodge <
[email protected]> wrote:
Agree with your proposal, Aled: WARN on deployment of any
deprecated/superseded catalog item, but permit it. Could also emit a
(different?) warning when rebinding to deprecated catalog items, but
that's less important IMO. I might even suggest that deprecated items
should still be available in the UI, but clearly discouraged for
deployment.
Agree with "disabled" in principle, but wonder how likely is it that
users will actually maintain that attribute on old catalog items.
Probably the best (== least surprising) available option however.
Your customer might appreciate a launch option or
brooklyn.property to
force deprecation warnings to be treated as errors, much like
configurable IDE settings for various compiler warnings.
"--strict" or
something.
A.
--
Alasdair Hodge
Principal Engineer,
Cloudsoft Corporation
On 18/08/2015 20:01, Aled Sage wrote:
Hi all,
A customer has asked that Brooklyn give an error when attempting to
deploy "deprecated" catalog items (i.e. refuse to deploy them).
In my opinion, this is not quite the classic meaning of "deprecated"
[1,2]. I suggest we add another state for catalog items (e.g.
"disabled").
Do people agree? Or think we should change the behaviour of
deprecated?
_*Existing behaviour*_
Items in the catalog can be marked as deprecated. This means the
item
is
still kept in the catalog, but its metadata says "deprecated".
In the Brooklyn web-console "add application" wizard, the deprecated
item is hidden. However, if you specify that exact version in YAML,
then
you can still use it.
Note: it's important to not delete the catalog item if any
applications
are using it. On rebind (i.e. restarting Brooklyn), we want to be
able
to find the catalog item for class-loading purposes (e.g. to find
out
the right OSGi bundles).
_*Proposal*_
We leave "deprecated" to have (mostly) the existing behaviour. We
augment this to log.warn whenever an app is deployed that is
deprecated.
(It would be nice to show in the web-console that a deprecated
app was
used, but I suggest we defer that).
We add "disabled". When a catalog item is disabled, it cannot be
used
for deploying new apps. Any such attempt would give an error.
_*In the future...*_
Longer term, we could consider changing the behaviour of
"deleting" a
catalog item. For example, the item would no longer be listable or
usable. However, it would not be expunged from the catalog until
there
were no more active uses of that catalog item. This would be
detected
automatically (akin to garbage collection).
We could perhaps add an "expunge" for catalog items that entirely
deleted it from the catalog, even if app instances existed.
Aled
[1] https://en.wikipedia.org/wiki/Deprecation
"indicate that it should be avoided"
"a feature, design, or practice that is permitted but no
longer
recommended"
[2]
http://docs.oracle.com/javase/7/docs/api/java/lang/Deprecated.html
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