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https://issues.apache.org/jira/browse/CASSANDRA-1820?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12971074#action_12971074
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Eric Evans commented on CASSANDRA-1820:
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> my reasoning behind this request is that you guys have put a lot of good work
> into cassandra-env.sh and i hate to duplicate all that into a custom one, just
> to change a port number.  this makes my personal upgrade path more painful 
> from
> release to release.

I understand, but this is a configuration file.  The expectation is that it 
will be edited by users to customize for their environments.

If anything, you could make a good argument for 8080 being a bad default, (it 
is, and that's probably why most people would need to change it), though it's 
also too late in the release cycle for a new default.

> - MAX_HEAP_SIZE was already coded to be configurable since by default it is 
> not
> set.  this is the very reason i thought that JMX_PORT could also be 
> configurable

FWIW, this wasn't the intention.  There is a commented entry just above that 
expression.


> Port 8080 is not always suitable for JMX
> ----------------------------------------
>
>                 Key: CASSANDRA-1820
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1820
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Packaging
>            Reporter: B. Todd Burruss
>            Assignee: B. Todd Burruss
>            Priority: Minor
>             Fix For: 0.7.0
>
>         Attachments: patch.txt
>
>   Original Estimate: 0h
>  Remaining Estimate: 0h
>
> if JMX_PORT is already set in environment, then cassandra-env.sh will not 
> override it.
> patch attached

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