[jira] [Commented] (ZOOKEEPER-2183) Change test port assignments to improve uniqueness of ports for multiple concurrent test processes on the same host.

["Chris Nauroth (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-2183?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14533572#comment-14533572 ] 

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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