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https://issues.apache.org/jira/browse/CASSANDRA-16511?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17320456#comment-17320456
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Brandon Williams commented on CASSANDRA-16511:
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At this point perhaps we should just wait for CASSANDRA-16595 to remove all the
parallelism from the build itself.
> Running tests in parallel can sometimes result in port collision
> ----------------------------------------------------------------
>
> Key: CASSANDRA-16511
> URL: https://issues.apache.org/jira/browse/CASSANDRA-16511
> Project: Cassandra
> Issue Type: Bug
> Components: Test/unit
> Reporter: Jacek Lewandowski
> Assignee: Jacek Lewandowski
> Priority: Normal
> Fix For: 4.0-rc1, 4.0
>
> Attachments: screenshot-1.png
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> When running unit tests with parallel execution we may sometimes notice the
> port collision. In this mode, test classes from the list get consecutive
> offsets which are added to native transport port, storage port and ssl
> storage port ( {{OffsetAwareConfigurationLoader}} ). However we add to the
> ports configured in {{test/conf/cassandra.yaml}} we as we can see we have the
> following default config:
> {code:java}
> storage_port: 7012
> ssl_storage_port: 7011 {code}
> This results in the situation that thread n has the same storage port as
> thread n+1 has ssl storage port. There are not much such tests, but we can
> see {{ConnectionTests}} failing frequently because of that.
> The other problem is that {{OffsetAwareConfigurationLoader}} does not adjust
> native transport ssl port.
> !screenshot-1.png!
>
> Patch at https://github.com/apache/cassandra/pull/925
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