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https://issues.apache.org/jira/browse/CASSANDRA-16082?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17186867#comment-17186867
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David Capwell commented on CASSANDRA-16082:
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[~Bereng] was hoping you could take a look at the changes to ToolRunner in the
PR? ToolRunner tried to read stdout and stderr in the same thread which caused
a dead lock. stdout and stderr are normally bounded queues so when full the
publisher is blocked waiting on the consumer, the tests were reading stderr
(which never closed) before stdout which caused stdout to fill up and block the
forked process. To work around this, stdout and stderr are handled by their
own thread. Also, the buffer wasn't shared in a safe way so changed how tests
access the stdout and stderr buffers
> Add a new jmxtool which can dump what JMX objects exist and diff
> ----------------------------------------------------------------
>
> Key: CASSANDRA-16082
> URL: https://issues.apache.org/jira/browse/CASSANDRA-16082
> Project: Cassandra
> Issue Type: Improvement
> Components: Test/dtest/python
> Reporter: David Capwell
> Assignee: David Capwell
> Priority: Normal
> Time Spent: 10m
> Remaining Estimate: 0h
>
> In order to help validate metric upgrade we first need to know what is new,
> what was removed, and what was changed. To help with this, we should add a
> new jmxtool which can dump the objects from JMX and diff them.
> Once we have this, we can also add a gold list of expected metrics and add
> tests to validate these metrics don’t change.
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