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From "Burn Lewis (JIRA)" <uima-...@incubator.apache.org>
Subject [jira] Commented: (UIMA-1109) Need ability to quiesce an instance of a service
Date Tue, 24 Mar 2009 15:49:53 GMT

    [ https://issues.apache.org/jira/browse/UIMA-1109?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12688720#action_12688720
] 

Burn Lewis commented on UIMA-1109:
----------------------------------

I don't think we need to support client-initiated shutdown until we have a way for clients
to deploy remote services. One use case would be when moving a service to a different machine
-- first deploy on the new machine and then gracefully undeploy on the old machine so that
no work is lost. Another would be when upgrading a service or UIMA-AS.
Currently services are started with deployAsyncService so we need a matching undeploy that
would be run from the same machine that would cause the service to stop processing input requests
and shutdown when the current request has been completed. For simplicity it should apply to
all instances of the service started by the deploy script, so could use the pid of the JVM
and a special signal, but may not be able to rely on the shutdown hook since the logs may
have been closed ... but perhaps we can add a Java signal handler.

> Need ability to quiesce an instance of a service
> ------------------------------------------------
>
>                 Key: UIMA-1109
>                 URL: https://issues.apache.org/jira/browse/UIMA-1109
>             Project: UIMA
>          Issue Type: Improvement
>          Components: Async Scaleout
>            Reporter: Burn Lewis
>
> We can deploy extra instances of a service seamlessly but also need a mechanism to undeploy
without losing any work, i.e. ask an instance to stop processing messages and shutdown when
it finishes its current work.

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