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https://issues.apache.org/jira/browse/UIMA-1129?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12625727#action_12625727
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Eddie Epstein commented on UIMA-1129:
-------------------------------------
{quote}
> bq.* I thought this option would be enabled by a performance tuning option. I
> don't see that in the patch, maybe I missed it.
>
> The primary use for this is to enable a serivce to return a delta CAS. The
> service may reply with a complete CAS or with delta CAS depending on what
> format the client will accept. So enabling delta CAS is per request and not a
> global setting.
-1. We can't have arbitrary clients turn on Delta CAS mode for everybody else.
This must be a global setting.
{quote}
No client turns on delta CAS for any other; each client request must specify
desire for a delta CAS response. A global setting for the service would not
work.
{quote}
> bq.* There should be a boolean member variable "deltaCasEnabled" or something
> like that. This should be used in the code for checking this condition, so
> it's clear what's going on (and easier to change in case the implementation
> changes).
>
> The idea here was that the same design initially used to support delta CAS
> would be used to support journalling as well. When journalling, there will be
> multiple markers created to track activity per component.
So? I don't get your point.
{quote}
I think Bhavani's point is that both CAS and journaling use the marker
mechanism to track CAS activity. Delta CAS is a designed to optimize
client-service overhead. Journaling can be used anywhere, and from a user's
point of view has nothing to do with delta CAS. Instead of
{{monospaced}} "if (this.svd.currentMark != null)" {{monospaced}}
how about using
{{monospaced}} "if (this.svd.casTrackingMark != null)" {{monospaced}}
> XMI serialization support for delta CAS
> -----------------------------------------
>
> Key: UIMA-1129
> URL: https://issues.apache.org/jira/browse/UIMA-1129
> Project: UIMA
> Issue Type: New Feature
> Components: Core Java Framework
> Reporter: Bhavani Iyer
> Assignee: Bhavani Iyer
> Attachments: UIMA-1129.patch
>
>
> Extend XMI serialization to enable serializing only the changes to the CAS.
> The requirement for delta CAS support in order to to reduce serialization
> overhead associated with remote services is described in the wiki page found
> here:
> http://cwiki.apache.org/UIMA/reducing-overhead-for-remote-service-calls.html.
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