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From "Michael Shuler (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-11725) Check for unnecessary JMX port setting in env vars at startup
Date Wed, 11 May 2016 16:02:12 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-11725?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15280329#comment-15280329
] 

Michael Shuler commented on CASSANDRA-11725:
--------------------------------------------

Confirming this commit works for allowing public IP setting in {{java.rmi.server.hostname}}
on a cloud server that does not know its public IP. That bind was failing previously, but
works out fine now. Thanks!

> Check for unnecessary JMX port setting in env vars at startup
> -------------------------------------------------------------
>
>                 Key: CASSANDRA-11725
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-11725
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Lifecycle
>            Reporter: Sam Tunnicliffe
>            Assignee: Sam Tunnicliffe
>            Priority: Minor
>              Labels: lhf
>             Fix For: 3.6
>
>
> Since CASSANDRA-10091, C* expects to always be in control of initializing its JMX connector
server. However, if  {{com.sun.management.jmxremote.port}} is set when the JVM is started,
the bootstrap agent takes over and sets up the server before any C* code runs. Because C*
is then unable to bind the server it creates to the specified port, startup is halted and
the root cause is somewhat unclear. 
> We should add a check at startup so a more informative message can be provided. This
would test for the presence of the system property which would differentiate from the case
where some other process is already bound to the port. 



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