[jira] [Created] (HBASE-21097) Flush pressure assertion may fail in testFlushThroughputTuning

["Ted Yu (JIRA)" <ji...@apache.org>]

Ted Yu created HBASE-21097:
------------------------------

             Summary: Flush pressure assertion may fail in testFlushThroughputTuning 
                 Key: HBASE-21097
                 URL: https://issues.apache.org/jira/browse/HBASE-21097
             Project: HBase
          Issue Type: Test
            Reporter: Ted Yu


From https://builds.apache.org/job/PreCommit-HBASE-Build/14137/artifact/patchprocess/patch-unit-hbase-server.txt :
{code}
[ERROR] testFlushThroughputTuning(org.apache.hadoop.hbase.regionserver.throttle.TestFlushWithThroughputController)  Time elapsed: 17.446 s  <<< FAILURE!
java.lang.AssertionError: expected:<0.0> but was:<1.2906294173808417E-6>
	at org.apache.hadoop.hbase.regionserver.throttle.TestFlushWithThroughputController.testFlushThroughputTuning(TestFlushWithThroughputController.java:185)
{code}
Here is the related assertion:
{code}
    assertEquals(0.0, regionServer.getFlushPressure(), EPSILON);
{code}
where EPSILON = 1E-6

In the above case, due to margin of 2.9E-7, the assertion didn't pass.
It seems the epsilon can be adjusted to accommodate different workload / hardware combination.



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