Ahmed Hussein created HADOOP-17314:
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Summary: Reduce port collisions in JUnits
Key: HADOOP-17314
URL: https://issues.apache.org/jira/browse/HADOOP-17314
Project: Hadoop Common
Issue Type: Bug
Reporter: Ahmed Hussein
Assignee: Ahmed Hussein
Several Junit tests passes a non-zero port number to
{{ServerSocketUtil.getPort()}}.
I noticed that those non-zero values are shared between test methods. Based, on
the implementation of {{ServerSocketUtil.getPort()}}, the port is checked then,
the socket is closed immediately.
Two concurrent tests can have the same port number, but one of them fails with
binding exceptions.
Passing a zero port number reduces the probability of returning the same port
numbers in two different tests, because the {{ServerSocketUtil.getPort()}} will
call a random port number.
An example of that is as described in HDFS-15618. {{testRead()}} between
{{TestBlockTokenWithDFSStriped}} and {{TestBlockTokenWithDFS}} where port 19870
is used by the two test cases.
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