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From "Jerry Cwiklik (JIRA)" <uima-...@incubator.apache.org>
Subject [jira] Commented: (UIMA-1454) Stale requests are processed and subsequently labeled as exceptions
Date Tue, 04 Aug 2009 14:46:14 GMT

    [ https://issues.apache.org/jira/browse/UIMA-1454?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12738992#action_12738992
] 

Jerry Cwiklik commented on UIMA-1454:
-------------------------------------

Fixed the code to silence connection failure exceptions. Instead of a stack trace a message
is logged indicating a connection problem. Also added a DoNotProcess list and a dedicated
cleanup thread that removes entries from the list after 30 minutes. 

> Stale requests are processed and subsequently labeled as exceptions
> -------------------------------------------------------------------
>
>                 Key: UIMA-1454
>                 URL: https://issues.apache.org/jira/browse/UIMA-1454
>             Project: UIMA
>          Issue Type: Bug
>          Components: Async Scaleout
>            Reporter: Eddie Epstein
>
> When a client submits one or more requests to a service and then terminates 
> before the service has a chance to reply, the service will still process the requests

> and then fail trying to send the reply with a long stack trace.
> There are two problems here: processing a request which cannot be replied to,
> and throwing an exception for expected behavior.
> The following is suggested:
> 1. catch these exceptions and log a single line at INFO level that a reply could 
>      not be sent to {identified reply queue name}
> 2. put this reply queue on a "do not process" list to be checked before processing
>     new requests.
> 3. clean up the "do not process" list based on time or max number of entries.

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