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From "Andrey Stepachev (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-13004) Make possible to explain why HTU.waitFor fails
Date Tue, 10 Feb 2015 12:33:11 GMT
Andrey Stepachev created HBASE-13004:
----------------------------------------

             Summary: Make possible to explain why HTU.waitFor fails
                 Key: HBASE-13004
                 URL: https://issues.apache.org/jira/browse/HBASE-13004
             Project: HBase
          Issue Type: Bug
          Components: test
    Affects Versions: 2.0.0
            Reporter: Andrey Stepachev
            Assignee: Andrey Stepachev
            Priority: Minor


HBaseTestingUtility has good methods for waiting conditions, but with one drawback, when waitfor
fails, there is no way to explain what happened (fail() called from internals and that is
not very easy to intercept and explain state of failure).

That would be great to have enhanced Predicate which can explain state after it failed to
wait for.

That can looks like
{code}
HUT.waitFor(10000, new ExplainingPredicate() {
   boolean evaluate() {
     ... some evaluation code
   }
   String explain() {
    ... generate brief explanation of what to be expected, but not happened
   }
}
{code}



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