ayushtkn commented on a change in pull request #2863:
URL: https://github.com/apache/hadoop/pull/2863#discussion_r639987959



##########
File path: 
hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DistributedFileSystem.java
##########
@@ -2388,8 +2389,15 @@ private SnapshotDiffReport getSnapshotDiffReportInternal(
     List<DiffReportListingEntry> deletedList = new ChunkedArrayList<>();
     SnapshotDiffReportListing report;
     do {
-      report = dfs.getSnapshotDiffReportListing(snapshotDir, fromSnapshot,
-          toSnapshot, startPath, index);
+      try {
+        report = dfs.getSnapshotDiffReportListing(snapshotDir, fromSnapshot,
+            toSnapshot, startPath, index);
+      } catch (RpcNoSuchMethodException e) {
+        // In case the server doesn't support getSnapshotDiffReportListing,
+        // fallback to getSnapshotDiffReport.
+        LOG.warn("Falling back to getSnapshotDiffReport {}", e.getMessage());

Review comment:
       yeps, Raised Addendum PR:
   https://github.com/apache/hadoop/pull/3056




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