Add abstraction layer to isolate cluster deployment mechanisms
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Key: HADOOP-6980
URL: https://issues.apache.org/jira/browse/HADOOP-6980
Project: Hadoop Common
Issue Type: Improvement
Components: test
Affects Versions: 0.22.0
Reporter: Konstantin Boudnik
Certain types of system tests might require to perform a fresh deployment of a
test cluster (e.g. upgrade tests, and similar).
This can be achieved by having an external way of deploying clusters and then
running the tests. However, this won't work if re-deployment is needed in a
middle of such test execution. In this case, Herriot needs to be able to
explicitly call a deployment mechanism to carry on the process.
However, there are many possible ways of implementing cluster deployment and
Herriot couldn't possibly be aware about all of them nor should be able to
satisfy all their different interfaces. Thus an abstract interface should
isolate plug-gable concrete implementations.
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