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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