smiklosovic commented on code in PR #2058:
URL: https://github.com/apache/cassandra/pull/2058#discussion_r1061550162


##########
src/java/org/apache/cassandra/streaming/StreamSession.java:
##########
@@ -1027,9 +1022,30 @@ public void receive(IncomingStreamMessage message)
     public void progress(String filename, ProgressInfo.Direction direction, 
long bytes, long total)
     {
         ProgressInfo progress = new ProgressInfo(peer, index, filename, 
direction, bytes, total);
+        updateMetricsOnProgress(progress);
         streamResult.handleProgress(progress);
     }
 
+    private void updateMetricsOnProgress(ProgressInfo progress)
+    {
+        ProgressInfo.Direction direction = progress.direction;
+        long lastSeenBytesStreamedForProgress = 
lastSeenBytesStreamed.getOrDefault(progress, 0L);

Review Comment:
   does this mean that `lastSeenBytesStreamed` map will be ever growing only as 
I dont see any place where we are removing it from that map? I would `assert` 
that direction is not null and then the `else` branch does not need `else if`.



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