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https://issues.apache.org/jira/browse/HADOOP-13716?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Steve Loughran updated HADOOP-13716:
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Summary: Add LambdaTestUtils class for tests to make use of (was: Add an
Eventually class to for tests to await eventual completion of lambda
expressions/test clauses)
> Add LambdaTestUtils class for tests to make use of
> --------------------------------------------------
>
> Key: HADOOP-13716
> URL: https://issues.apache.org/jira/browse/HADOOP-13716
> Project: Hadoop Common
> Issue Type: New Feature
> Components: test
> Affects Versions: 2.8.0
> Reporter: Steve Loughran
> Assignee: Steve Loughran
> Attachments: HADOOP-13716-001.patch, HADOOP-13716-002.patch
>
>
> To make our tests robust against timing problems and eventual consistent
> stores, we need to do more spin & wait for state.
> We have some code in {{GenericTestUtils.waitFor}} to await a condition being
> met, but the predicate it calls doesn't throw exceptions, there's no way for
> a probe to throw an exception, and all you get is the eventual "timed out"
> message.
> We can do better, and in closure-ready languages (scala & scalatest, groovy
> and some slider code) we've examples to follow. Some of that work has been
> reimplemented slightly in {{S3ATestUtils.eventually}}
> I propose adding a class in the test tree, {{Eventually}} to be a
> successor/replacement for these.
> # has an eventually/waitfor operation taking a predicate that throws an
> exception
> # has an "evaluate" exception which tries to evaluate an answer until the
> operation stops raising an exception. (again, from scalatest)
> # plugin backoff strategies (from Scalatest; lets you do exponential as well
> as linear)
> # option of adding a special handler to generate the failure exception (e.g.
> run more detailed diagnostics for the exception text, etc).
> # be Java 8 lambda expression friendly
> # be testable and tested itself.
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