jojochuang commented on a change in pull request #3235:
URL: https://github.com/apache/hadoop/pull/3235#discussion_r693765302



##########
File path: 
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/ha/TestEditLogTailer.java
##########
@@ -429,19 +432,29 @@ public void 
testStandbyTriggersLogRollsWhenTailInProgressEdits()
       waitForStandbyToCatchUpWithInProgressEdits(standby, activeTxId,
           standbyCatchupWaitTime);
 
+      long curTime = standby.getNamesystem().getEditLogTailer().getTimer()
+          .monotonicNow();
+      long inSufficientTimeForLogRoll = logRollPeriodMs / 3;
+      final FakeTimer testTimer =
+          new FakeTimer(curTime + inSufficientTimeForLogRoll);
+      standby.getNamesystem().getEditLogTailer().setTimerForTest(testTimer);

Review comment:
       just a thought. it would be great if we can refactor the MiniDfsCluster, 
the NameNode, FSNamesystem and EditLogTailer such that they take a FakeTimer as 
a parameter during initialization. If all the tests adopt the way of FakeTimer 
we wouldn't have so many flaky tests. But I reckon it's out of scope of this 
change.




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