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From "Robert Liguori (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (AMQ-3242) Change prefetch size limit for topics from 32766 to 32767
Date Sun, 27 Mar 2011 20:28:05 GMT

     [ https://issues.apache.org/jira/browse/AMQ-3242?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Robert Liguori updated AMQ-3242:
--------------------------------

    Description: 
The default prefetch size limit for topics is noted as 32766; http://activemq.apache.org/performance-tuning.html

The FUSE source documentation (http://fusesource.com/docs/broker/5.4/tuning/index.html) states,
"Default prefetch limit is 32766. The default limit of 32766 is the largest value of a short
and is the maximum possible value of the prefetch limit.".

The largest value for a short actually is 32767 (http://java.sun.com/docs/books/jls/second_edition/html/typesValues.doc.html).

This is really a trivial issue, but should the default prefetch limit for topics be changed
from 32766 to 32767 to reflect the actual ceiling?

And of course, I would recommend changing the default to 32767, when the maximum has been
exceeded.  The following warning shows the applied default of 32766:
16:22:40 WARN  maximum prefetch limit has been reset from 50000 to 32766


  was:
The default prefetch size limit for topics is noted as 32766; http://activemq.apache.org/performance-tuning.html

The FUSE source documentation (http://fusesource.com/docs/broker/5.4/tuning/index.html) states,
"Default prefetch limit is 32766. The default limit of 32766 is the largest value of a short
and is the maximum possible value of the prefetch limit.".

The largest value for a short actually is 32767 (http://java.sun.com/docs/books/jls/second_edition/html/typesValues.doc.html).

This is really a trivial issue, but should the default prefetch limit for topics be changed
from 32766 to 32767 to reflect the actual ceiling?



> Change prefetch size limit for topics from 32766 to 32767
> ---------------------------------------------------------
>
>                 Key: AMQ-3242
>                 URL: https://issues.apache.org/jira/browse/AMQ-3242
>             Project: ActiveMQ
>          Issue Type: Improvement
>            Reporter: Robert Liguori
>            Priority: Trivial
>
> The default prefetch size limit for topics is noted as 32766; http://activemq.apache.org/performance-tuning.html
> The FUSE source documentation (http://fusesource.com/docs/broker/5.4/tuning/index.html)
states, "Default prefetch limit is 32766. The default limit of 32766 is the largest value
of a short and is the maximum possible value of the prefetch limit.".
> The largest value for a short actually is 32767 (http://java.sun.com/docs/books/jls/second_edition/html/typesValues.doc.html).
> This is really a trivial issue, but should the default prefetch limit for topics be changed
from 32766 to 32767 to reflect the actual ceiling?
> And of course, I would recommend changing the default to 32767, when the maximum has
been exceeded.  The following warning shows the applied default of 32766:
> 16:22:40 WARN  maximum prefetch limit has been reset from 50000 to 32766

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