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question asked: Aug 08 '18, 7:39 p.m.
question was seen: 713 times
last updated: Aug 16 '18, 10:01 p.m.

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Is a snapshot preserved when the stream's components are replaced ?

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Tammy Parker (3●6) | asked Aug 08 '18, 7:39 p.m.

If we have a stream that has no snapshots on it ( has components of a given baseline copied from another stream ) and we were to take a snapshot on the stream and then replace the components again to get a different/newer baseline, would the snapshot be preserved or userful ?  Or, would replacing the components render the snapshot useless?

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Ralph Schoon (63.4k●3●36●46) | answered Aug 09 '18, 5:32 a.m.
FORUM ADMINISTRATOR / FORUM MODERATOR / JAZZ DEVELOPER

Tammy,

my 2 cents: A snapshot collects the baselines for component in a stream or repository workspace (baselines are created if needed). It has to be stored somewhere. you set a stream as owner. Regardless which owner you use the snapshot stores the snapshot, it can be used to recreate the configuration it stores. 

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Tammy Parker commented Aug 09 '18, 9:57 a.m. | edited Aug 16 '18, 10:27 a.m.

Thanks Ralph for the reply.

After posting this question and before your reply, I tried this scenario --

1. I created a stream test4tammy with the aa component from stream GAstream
2. I created a stream snapshot on test4tammy, gm-snapshot (baseline on the aa component did not change)
3. I replaced the aa component with the one from stream FPstream
4. I created a snapshot on the test4tammy stream, FPstream-latest (baseline on the aa component changed to FPstream-latest)
5. I did a compare between the 2 snapshots and see the list of changes between them

I had been concerned that replacing the components of the test4tammy stream might affect the initial snapshot but this test confirmed that it did not.

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Geoffrey Clemm (30.1k●3●30●35) | answered Aug 16 '18, 10:00 p.m.
FORUM ADMINISTRATOR / FORUM MODERATOR / JAZZ DEVELOPER
edited Aug 16 '18, 10:01 p.m.

Just to be extra clear, the configuration (set of versions) selected by a snapshot is immutable (cannot be changed).   Any subsequent changes to the stream or workshop from which that snapshot was created has no effect on the snapshot.

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