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From Jörn Kottmann (JIRA) <...@uima.apache.org>
Subject [jira] Commented: (UIMA-1726) Long GC causes UIMA AS service to loose broker connection and marks the client as dead
Date Mon, 03 May 2010 08:16:55 GMT

    [ https://issues.apache.org/jira/browse/UIMA-1726?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12863262#action_12863262

Jörn Kottmann commented on UIMA-1726:

The warning is now longer logged in our test system after the update to revision 937028.

> Long GC causes UIMA AS service to loose broker connection and marks the client as dead
> --------------------------------------------------------------------------------------
>                 Key: UIMA-1726
>                 URL: https://issues.apache.org/jira/browse/UIMA-1726
>             Project: UIMA
>          Issue Type: Bug
>          Components: Async Scaleout
>            Reporter: Jerry Cwiklik
>            Assignee: Jerry Cwiklik
>             Fix For: 2.3AS
> When the JVMs GC takes a long time, the UIMA AS fails to validate the broker connection
and proceeds to close it as if the broker died. It seems that the long GC freezes the jvm
and prevents the low level socket pinging to work correctly. This pinging is a mechanism by
which the low level AMQ code relies upon to detect a broker failure. In this case, the broker
is actually fine. The side effect of the above is that the UIMA AS service falsely adds the
client to the DoNotProcess list. This is an optimization that was recently added that prevents
wasting processing cycles while handling CASes that are known to have come from clients that
had gone away. Each CAS origin is checked against that list and if there is a match the CAS
is thrown away. It seems that we need a better mechanism to detect broker failure.  

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