ZanderXu commented on code in PR #6762:
URL: https://github.com/apache/hadoop/pull/6762#discussion_r1897589520


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hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java:
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@@ -2058,7 +2080,7 @@ BatchedListEntries<OpenFileEntry> listOpenFiles(long 
prevId,
 
   public BatchedListEntries<OpenFileEntry> getFilesBlockingDecom(long prevId,
       String path) {
-    assert hasReadLock();
+    assert hasReadLock(RwLockMode.FS);

Review Comment:
   Thanks @hfutatzhanghb for your review. 
   Both `dataNode.getLeavingServiceStatus().getOpenFiles()` and 
`blockManager.getDatanodeManager().getDatanodes())` are already thread-safe, so 
the BMLock is unnecessary here. 



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