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https://issues.apache.org/jira/browse/UIMA-1800?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12876316#action_12876316
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Jerry Cwiklik edited comment on UIMA-1800 at 6/7/10 1:27 PM:
-------------------------------------------------------------
Revert code that handles internal messaging (to/from colocated delegate) to
previous version that is not using BlockingThreadExecutor. Specifically, revert
VMTransport and UimaVmMessageDispatcher. The BlockingExecutor should still be
used to process reply messages from remotes. For colocated components dont
require a samphore for submitting messages to a queue.
was (Author: cwiklik):
Revert to previous version that is not using BlockingThreadExecutor.
> UIMA AS should block msg submitter thread if a thread pool is empty
> -------------------------------------------------------------------
>
> Key: UIMA-1800
> URL: https://issues.apache.org/jira/browse/UIMA-1800
> Project: UIMA
> Issue Type: Bug
> Components: Async Scaleout
> Affects Versions: 2.3AS
> Reporter: Jerry Cwiklik
> Assignee: Jerry Cwiklik
>
> If a queue scaleout factor > 1, the UIMA AS creates a thread pool and a
> managing Executor object. The threads in a pool are used to process incoming
> messages. A submitter thread receives a jms message via a callback from
> Spring and delivers it to the Executor for processing in one of the threads
> from the pool. If a thread pool is empty, the Executor policy is to use the
> submitter thread to process the message. Since there is a single submitter
> thread (per queue) this policy slows down the submitter thread and prevents
> it from delivering messages for processing by other threads.
>
> Change the code to prevent the submitter thread from doing processing.
> Instead, block the submitter thread if the thread pool becomes empty. As soon
> as a thread becomes available, the submitter thread should deliver a message
> and wait for a callback from Spring.
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