LALAYANG opened a new pull request #3298:
URL: https://github.com/apache/hadoop/pull/3298


   Link to issue: 
[https://issues.apache.org/jira/browse/MAPREDUCE-7361](https://issues.apache.org/jira/browse/MAPREDUCE-7361)
   ## What is the purpose of this change
   This PR is to clean the polluted shared status among the 3 tests: 
   ```
   Test1: 
org.apache.hadoop.mapred.TestTaskProgressReporter.testBytesWrittenRespectingLimit
   Test2: org.apache.hadoop.mapred.TestTaskProgressReporter.testScratchDirSize
   Test3: org.apache.hadoop.mapred.TestTaskProgressReporter.testTaskProgress
   ```
   - Test1 and Test2 pollute the shared status with Test3, which can make test3 
fail. 
   - It may be better to clean state pollutions so that some other tests won't 
fail in the future due to the shared state polluted by this test.
   ## Reproduce the test failures
   Run the tests in the same JVM in the following orders:
   - Test1 and Test3
   - Test2 and Test3
   ## Expected result
   The tests should run successfully when multiple tests that use this shared 
state are run in the same JVM.
   ## Actual result
   - Run Test1 and Test3, Test3 fails:
   ```
   [ERROR]   TestTaskProgressReporter.testTaskProgress:267 expected:<[2]> but 
was:<[3]>
   ```
   - Run Test2 and Test3, Test3 fails:
   ```
   [ERROR]   TestTaskProgressReporter.testTaskProgress:267 expected:<[2]> but 
was:<[11]>
   ```
   
   ## Fix
   Clean the value of `statusUpdateTimes` to 0 at the start of Test3 to clean 
the pollution from Test1 and Test2.


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