Stephen O'Donnell f6efb58b07 HDFS-15621. Datanode DirectoryScanner uses excessive memory (#2849). Contributed by Stephen O'Donnell
(cherry picked from commit 605ed85c291a6250b077da32a49dbb35f3b78bf7)

 Conflicts:
	hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/TestFsDatasetImpl.java
2021-04-26 11:23:56 +01:00
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