[jira] Reopened: (UIMA-1799) UIMA AS should provide a way to increase prefetch size on a reply queue

["Jerry Cwiklik (JIRA)" <de...@uima.apache.org>]

     [ https://issues.apache.org/jira/browse/UIMA-1799?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jerry Cwiklik reopened UIMA-1799:
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Accidentally commented out a chunk of code that registers temp queue listener with InputChannel. This leads to a hang when stopping a service using JMX or from a command line.

> UIMA AS should provide a way to increase prefetch size on a reply queue
> -----------------------------------------------------------------------
>
>                 Key: UIMA-1799
>                 URL: https://issues.apache.org/jira/browse/UIMA-1799
>             Project: UIMA
>          Issue Type: Improvement
>          Components: Async Scaleout
>    Affects Versions: 2.3AS
>            Reporter: Jerry Cwiklik
>            Assignee: Jerry Cwiklik
>
> UIMA AS currently provides no way to change prefetch size on a reply queue. A default of 1 is used. This slows down the rate of processing messages by a service. Each UIMA AS service has a dedicated submitter thread whose main job is to deliver a message to a thread pool for processing. Since the submitter thread executes very fast and the prefetch=1 , the submitter thread is constantly waiting for the Broker to deliver the next message. Increasing prefetch forces the Broker to deliver multiple messages to a service which buffers them until the submitter thread is ready. The size of the prefetch should be equal to a scalout factor defined on each reply queue. The default is still 1. 
> NOTE: increasing prefetch effects memory requirement for the service. The larger the prefetch the more messages are buffered taking up more memory. 

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