Use a random ZK client port in unit tests so we can run them in parallel
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Key: HBASE-4746
URL: https://issues.apache.org/jira/browse/HBASE-4746
Project: HBase
Issue Type: Improvement
Reporter: Mikhail Bautin
The hard-coded ZK client port has long been a problem for running HBase test
suite in parallel. The mini ZK cluster should run on a random free port, and
that port should be passed to all parts of the unit tests that need to talk to
the mini cluster. In fact, randomizing the port exposes a lot of places in the
code where a new configuration is instantiated, and as a result the client
tries to talk to the default ZK client port and times out.
The initial fix is for 0.89-fb, where it already allows to run unit tests in
parallel in 10 minutes. A fix for the trunk will follow.
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