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From "Paul Gale (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (AMQ-4674) ActiveMQ 5.x does not support the notion of a grace-period for heart beats as supported by the STOMP protocol
Date Wed, 07 Aug 2013 20:49:48 GMT

     [ https://issues.apache.org/jira/browse/AMQ-4674?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Paul Gale updated AMQ-4674:
---------------------------

    Description: 
Regarding the configuration of heart beating the STOMP protocol spec states:

    "- because of timing inaccuracies, the receiver SHOULD be tolerant and take into account
an error margin"

However, it appears that ActiveMQ 5.x is not tolerant of any error margin. 

Despite the fact that the spec says SHOULD rather than MUST it would make the implementation
of STOMP clients easier if the error margin was published.

As the broker aggressively enforces the heart beat timeouts false failover attempts can result.

Apparently Apollo supports an error margin of 1.5x the configured heart beat. If it could
be made configurable that would be even better! 


  was:
Regarding the configuration of heart beating the STOMP protocol spec states:

    "- because of timing inaccuracies, the receiver SHOULD be tolerant and take into account
an error margin"

However, it appears that ActiveMQ 5.x is not tolerant of any error margin. 

Despite the fact that the spec says SHOULD rather than MUST it would make the implementation
of STOMP clients easier if the error margin was published.

Apparently Apollo supports an error margin of 1.5x the configured heart beat. If it could
be made configurable that would be even better! 


    
> ActiveMQ 5.x does not support the notion of a grace-period for heart beats as supported
by the STOMP protocol
> -------------------------------------------------------------------------------------------------------------
>
>                 Key: AMQ-4674
>                 URL: https://issues.apache.org/jira/browse/AMQ-4674
>             Project: ActiveMQ
>          Issue Type: Bug
>    Affects Versions: 5.8.0
>            Reporter: Paul Gale
>              Labels: easyfix
>             Fix For: 5.9.0
>
>
> Regarding the configuration of heart beating the STOMP protocol spec states:
>     "- because of timing inaccuracies, the receiver SHOULD be tolerant and take into
account an error margin"
> However, it appears that ActiveMQ 5.x is not tolerant of any error margin. 
> Despite the fact that the spec says SHOULD rather than MUST it would make the implementation
of STOMP clients easier if the error margin was published.
> As the broker aggressively enforces the heart beat timeouts false failover attempts can
result.
> Apparently Apollo supports an error margin of 1.5x the configured heart beat. If it could
be made configurable that would be even better! 

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