aajisaka commented on a change in pull request #3065:
URL: https://github.com/apache/hadoop/pull/3065#discussion_r647376745
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File path:
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
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@@ -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) {
Review comment:
@ferhui Thank you for your comment. The change makes sense to keep the
previous behavior.
Now I have a question about the previous (and current) behavior.
https://github.com/apache/hadoop/blob/85517df11ae33ab3a06654d40a1ef4d8eae013e3/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java#L1997-L1998
If there are multiple DataNodes with open files, are the inode IDs really
sorted?
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