[jira] [Created] (UIMA-5162) uv3 change id to match v2

["Marshall Schor (JIRA)" <de...@uima.apache.org>]

Marshall Schor created UIMA-5162:
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             Summary: uv3 change id to match v2
                 Key: UIMA-5162
                 URL: https://issues.apache.org/jira/browse/UIMA-5162
             Project: UIMA
          Issue Type: Improvement
            Reporter: Marshall Schor
            Assignee: Marshall Schor
            Priority: Minor


v3's current ids start at 1 and increment by 1.  v2 ids start at 1 and increment by the "size" on the main int heap of the FS. 

Pros: v3's serializations / deserializations often need to recreate the v2 ids so the serialized forms can be read by v2 impl (for backwards compatibility), so this can have a performance benefit. It also improves the match for xmi/json id-refs with version 2 (although xmi deserialization should still work without this).  

Cons: Changing to the v2 style will reduce the maximum number of Feature Structures per CAS somewhat; it will be the same as the current limit that exists in v2.

Because of pros/cons, keep both impls, together with a global static final boolean switch to pick one or the other (and set it for now to use the v2 style). 



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