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https://issues.apache.org/jira/browse/UIMA-5106?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15498418#comment-15498418
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Richard Eckart de Castilho commented on UIMA-5106:
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I understand, thanks.

Regarding the preservation of IDs across serialization: this is very useful. 

Maybe it should not always be mandatory. A user may intentionally want to 
"garbage collect" the ID space. E.g. right now with v2, I use a variant of 
SERIALIZED if I want to preserve IDs and COMPRESSED_FILTERED if I wanted to 
garbage-collect IDs (and FSes). I could imagine that with v3, the preservation 
of IDs could become a parameter to some serialization/deserialization formats.

> uv3 constant "id" for FSs (Proposed new Feature for uv3)
> --------------------------------------------------------
>
>                 Key: UIMA-5106
>                 URL: https://issues.apache.org/jira/browse/UIMA-5106
>             Project: UIMA
>          Issue Type: New Feature
>          Components: Core Java Framework
>            Reporter: Marshall Schor
>            Priority: Minor
>             Fix For: 3.0.0SDKexp
>
>
> Add constant ID for FSs. This would be an incrementing, long value. It would 
> be constant through serialization/ deserialization cycles. There would be a 
> lazily created map from longs to FSs (via weak links) to allow direct access 
> from the ID to the FS.  Lazy intent is to not have a cost for this 
> (space/time) other than the cost for 1 long / FS, if it is not used.
> We could make this feature optional, as well, to avoid the 8 bytes per FS 
> overhead, but in V3, I think that's not a good tradeoff (space savings vs 
> complexity).  
> Issues: 
> * Current design allows parallelism of services, with returned results 
> "stacked" into receiving CAS; would need to change (some of) the IDs coming 
> back.
> CAS would need to have the high-water-mark value as part of serializations.
> Backwards compatibility:
> * loading V2 CASs: generate new IDs upon loading.
> * serializing to V2: (for connecting to V2 services): drop the IDs.
> This is a proposed new V3 feature; comments appreciated.



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