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https://issues.apache.org/jira/browse/ZOOKEEPER-2183?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14533572#comment-14533572
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Chris Nauroth commented on ZOOKEEPER-2183:
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We've had some prior discussion of this topic on the dev mailing list:
http://mail-archives.apache.org/mod_mbox/zookeeper-dev/201505.mbox/%3CCANLc_9K69jkAzHx2xdh-GPhDTMJtLsUCn5zTcWbg1cj09ugNiQ%40mail.gmail.com%3E
> Change test port assignments to improve uniqueness of ports for multiple
> concurrent test processes on the same host.
> --------------------------------------------------------------------------------------------------------------------
>
> Key: ZOOKEEPER-2183
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2183
> Project: ZooKeeper
> Issue Type: Improvement
> Components: tests
> Reporter: Chris Nauroth
> Assignee: Chris Nauroth
>
> Tests use {{PortAssignment#unique}} for assignment of the ports to bind
> during tests. Currently, this method works by using a monotonically
> increasing counter from a static starting point. Generally, this is
> sufficient to achieve uniqueness within a single JVM process, but it does not
> achieve uniqueness across multiple processes on the same host. This can
> cause tests to get bind errors if there are multiple pre-commit jobs running
> concurrently on the same Jenkins host. This also prevents running tests in
> parallel to improve the speed of pre-commit runs.
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