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https://issues.apache.org/jira/browse/HDFS-16935?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17694594#comment-17694594
 ] 

ASF GitHub Bot commented on HDFS-16935:
---------------------------------------

steveloughran commented on code in PR #5432:
URL: https://github.com/apache/hadoop/pull/5432#discussion_r1120168448


##########
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/TestFsDatasetImpl.java:
##########
@@ -1101,15 +1099,11 @@ public void testReportBadBlocks() throws Exception {
 
       block = DFSTestUtil.getFirstBlock(fs, filePath);
       // Test for the overloaded method reportBadBlocks
-      dataNode.reportBadBlocks(block, dataNode.getFSDataset()
-          .getFsVolumeReferences().get(0));
-      Thread.sleep(3000);
-      BlockManagerTestUtil.updateState(cluster.getNamesystem()
-          .getBlockManager());
-      // Verify the bad block has been reported to namenode
-      Assert.assertEquals(1, 
cluster.getNamesystem().getCorruptReplicaBlocks());
-    } finally {
-      cluster.shutdown();
+      dataNode.reportBadBlocks(block, 
dataNode.getFSDataset().getFsVolumeReferences().get(0));
+      DataNodeTestUtils.triggerHeartbeat(dataNode);

Review Comment:
   this is why we don't need a sleep() any more, right? if so, yes, it fixes 
the problem deterministically





> TestFsDatasetImpl.testReportBadBlocks brittle
> ---------------------------------------------
>
>                 Key: HDFS-16935
>                 URL: https://issues.apache.org/jira/browse/HDFS-16935
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: test
>    Affects Versions: 3.4.0, 3.3.5, 3.3.9
>            Reporter: Steve Loughran
>            Assignee: Viraj Jasani
>            Priority: Minor
>              Labels: pull-request-available
>
> jenkins failure as sleep() time not long enough
> {code}
> Failing for the past 1 build (Since #4 )
> Took 7.4 sec.
> Error Message
> expected:<1> but was:<0>
> Stacktrace
> java.lang.AssertionError: expected:<1> but was:<0>
>       at org.junit.Assert.fail(Assert.java:89)
>       at org.junit.Assert.failNotEquals(Assert.java:835)
>       at org.junit.Assert.assertEquals(Assert.java:647)
>       at org.junit.Assert.assertEquals(Assert.java:633)
> {code}
> assert is after a 3s sleep waiting for reports coming in.
> {code}
>       dataNode.reportBadBlocks(block, dataNode.getFSDataset()
>           .getFsVolumeReferences().get(0));
>       Thread.sleep(3000);                                           // 3s 
> sleep
>       BlockManagerTestUtil.updateState(cluster.getNamesystem()
>           .getBlockManager());
>       // Verify the bad block has been reported to namenode
>       Assert.assertEquals(1, 
> cluster.getNamesystem().getCorruptReplicaBlocks());  // here
> {code}
> LambdaTestUtils.eventually() should be used around this assert, maybe with an 
> even shorter initial delay so on faster systems, test is faster.



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