aajisaka commented on a change in pull request #3065:
URL: https://github.com/apache/hadoop/pull/3065#discussion_r647951023



##########
File path: 
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
##########
@@ -1996,7 +1996,12 @@ private void metaSave(PrintWriter out) {
     LightWeightHashSet<Long> openFileIds = new LightWeightHashSet<>();
     for (DatanodeDescriptor dataNode :
         blockManager.getDatanodeManager().getDatanodes()) {
-      for (long ucFileId : dataNode.getLeavingServiceStatus().getOpenFiles()) {
+      // Sort open files
+      LightWeightHashSet<Long> dnOpenFiles =
+          dataNode.getLeavingServiceStatus().getOpenFiles();
+      Long[] dnOpenFileIds = new Long[dnOpenFiles.size()];
+      Arrays.sort(dnOpenFiles.toArray(dnOpenFileIds));
+      for (Long ucFileId : dnOpenFileIds) {
         INode ucFile = getFSDirectory().getInode(ucFileId);
         if (ucFile == null || ucFileId <= prevId ||
             openFileIds.contains(ucFileId)) {

Review comment:
       Yes, I'm +1 to keep the same as before. I'll file a new jira. Thanks!




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