Chris Nauroth created ZOOKEEPER-2183:
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Summary: 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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