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https://issues.apache.org/jira/browse/UIMA-2431?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13418364#comment-13418364
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Marshall Schor commented on UIMA-2431:
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See some related discussion on the wiki, here:
https://cwiki.apache.org/confluence/display/UIMA/APIs+for+CAS+Journaling
> allow CAS changes to be rolled back to specified marks
> ------------------------------------------------------
>
> Key: UIMA-2431
> URL: https://issues.apache.org/jira/browse/UIMA-2431
> Project: UIMA
> Issue Type: New Feature
> Components: Core Java Framework
> Reporter: Mike Barborak
>
> As a CAS moves through a pipeline, there is a well defined sequence of
> changes being applied to it. Currently, each change is applied to the CAS
> immediately and so the sequence is lost. It would be nice to preserve the
> sequence as it would make possible some useful features.
> One such feature would be the ability to rollback the sequence of changes to
> some specified point. Imagine then a pipeline where a mark is written to the
> sequence before each component is run. Then, if the component threw an
> exception or entered some other undesirable state, the CAS could be rolled
> back to the last mark. It could then be serialized to disk for debugging or a
> flow controller could reroute it in the pipeline.
> Even when a component didn't enter such a state, being able to rollback a CAS
> to a particular component's input state is useful for debugging performance
> (in function or in resource usage) of that component.
> Being able to track changes also means being able to model CAS deltas. This
> functionality could become the base for communicating CAS changes efficiently
> for example in the case that a UIMA-AS service needs to report changes it
> made to a large input CAS.
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