goiri commented on a change in pull request #2408:
URL: https://github.com/apache/hadoop/pull/2408#discussion_r513541376



##########
File path: 
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestFileChecksum.java
##########
@@ -575,6 +596,8 @@ private FileChecksum getFileChecksum(String filePath, int 
range,
       dnIdxToDie = getDataNodeToKill(filePath);
       DataNode dnToDie = cluster.getDataNodes().get(dnIdxToDie);
       shutdownDataNode(dnToDie);
+      // wait enough time for the locations to be updated.
+      Thread.sleep(STALE_INTERVAL);

Review comment:
       I am not very close to this part of the code but there must be ways to 
force the statistics to update.
   Not sure who can help with this part of the code.




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