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https://issues.apache.org/jira/browse/UIMA-6048?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17676077#comment-17676077
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Richard Eckart de Castilho commented on UIMA-6048:
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DUCC has been retired.
> UIMA-DUCC: simplify pullservice protocol
> ----------------------------------------
>
> Key: UIMA-6048
> URL: https://issues.apache.org/jira/browse/UIMA-6048
> Project: UIMA
> Issue Type: Improvement
> Components: DUCC
> Reporter: Jaroslaw Cwiklik
> Assignee: Jaroslaw Cwiklik
> Priority: Major
> Fix For: future-DUCC
>
>
> Currently the pullservice uses 3 way protocol when communicating with a
> client (like JD). Its GET, ACK, and END. Each requires a round trip from a
> pullservice to the client and back.
> It would be more efficient to remove the ACK, call GET once (to get initial
> task) and just keep calling END which would do two things:
> Convey end of task (success or failure)
> Return new task to process
> The ACK was a carry over from the time when JMS (ActiveMQ) was used as
> transport and it occasionally was loosing tasks. Its main function was to
> indicate which service (and thread) was processing the task. HTTP seems more
> robust and the ACK is no longer necessary.
> To support the new protocol, JD needs refactoring to stop relying on ACK and
> also to fetch a new task (or null) in response to END.
>
>
>
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