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Date: Wed, 1 Sep 2010 15:28:53 -0400 (EDT)
From: "Ken Giusti (JIRA)" <qpid-dev@incubator.apache.org>
To: qpid-dev@incubator.apache.org
Subject: [jira] Closed: (QPID-2841) QMF: set TTL on agent heartbeat messages
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     [ https://issues.apache.org/jira/browse/QPID-2841?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ken Giusti closed QPID-2841.
----------------------------

    Resolution: Fixed

Set the TTL value in agent heartbeat messages to 2 times the agent heartbeat interval.  That should be enough to guarantee that at least one valid heartbeat remains available at all times.

> QMF: set TTL on agent heartbeat messages
> ----------------------------------------
>
>                 Key: QPID-2841
>                 URL: https://issues.apache.org/jira/browse/QPID-2841
>             Project: Qpid
>          Issue Type: Improvement
>          Components: Qpid Managment Framework
>         Environment: all
>            Reporter: Ken Giusti
>            Assignee: Ken Giusti
>
> Heartbeats are issued periodically by QMF agents.  Each heartbeat is stateless - there is no information loss if a heartbeat is dropped or ignored by the client.   While performance testing, it was discovered that multiple heartbeats will queue up should a console be unable to consume them fast enough.  Most of these heartbeats are stale: the agent has issue a new heartbeat(s) since the older heartbeat was queued.  Processing these "stale" heartbeats is useless.
> By setting the TTL in heartbeat messages, stale heartbeats will be discarded by the broker instead of being sent to the console.

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