[jira] [Created] (UIMA-3691) support multi-threaded shared contexts for CasPools for CAS Multipliers

["Marshall Schor (JIRA)" <de...@uima.apache.org>]

Marshall Schor created UIMA-3691:
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             Summary: support multi-threaded shared contexts for CasPools for CAS Multipliers
                 Key: UIMA-3691
                 URL: https://issues.apache.org/jira/browse/UIMA-3691
             Project: UIMA
          Issue Type: Improvement
          Components: Core Java Framework
    Affects Versions: 2.5.0SDK
            Reporter: Marshall Schor
            Assignee: Marshall Schor
            Priority: Minor
             Fix For: 2.6.0SDK


The current UIMA framework design is quite flexible when it comes to producing analysis engines (AEs), to allow various scale-outs on a single JVM. When scaled out, via multiple instances of the AEs, it's possible to have the multiple instances share the UIMA Context (by passing a reference to it in additional params). The current design for CAS Multipliers creates a pool for each CAS Multiplier, and hangs it off of the UIMA Context.  The problem with this approach is that if the scaleout approach chooses to share a common CAS Context with all scaled out instances, then the CAS pool will run out of CASes.  A better design is to hang the pool off of an object that will scale with the Annotator itself, rather than the shared context.  This can be done by changing the implementation of getEmptyCas() in the CasMultiplier_implBase class(es).  The current implementation calls the same method on the (potentially shared) UIMA Context object; this could be deprecated with a note saying that this will still work, but not with scaled out impls that share the UIMA context object.



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