[jira] [Created] (MAPREDUCE-7311) Fix non-idempotent test in TestTaskProgressReporter

["Zhengxi Li (Jira)" <ji...@apache.org>]

Zhengxi Li created MAPREDUCE-7311:
-------------------------------------

             Summary: Fix non-idempotent test in TestTaskProgressReporter
                 Key: MAPREDUCE-7311
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-7311
             Project: Hadoop Map/Reduce
          Issue Type: Bug
            Reporter: Zhengxi Li


The test {{`org.apache.hadoop.mapred.TestTaskProgressReporter.testBytesWrittenRespectingLimit`}} is not idempotent and fails if run twice in the same JVM, because it pollutes state shared among tests. It may be good to clean this state pollution so that some other tests do not fail in the future due to the shared state polluted by this test.
h3. Details

Running {{`TestTaskProgressReporter.testBytesWrittenRespectingLimit`}} twice would result in the second run failing with the following assertion:
{noformat}
Assert.assertEquals(failFast, threadExited)
{noformat}
The root cause for this is that when\{{`testBytesWrittenRespectingLimit`}} writes some bytes on the local file system, some counters are being incremented. The problem is that, after the test is done, the counter is not reset. With this polluted shared state, assumptions are broken, resulting in test failure in the second run.



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