jtuglu-netflix commented on code in PR #17847:
URL: https://github.com/apache/druid/pull/17847#discussion_r2066988222


##########
server/src/main/java/org/apache/druid/segment/realtime/SegmentGenerationMetrics.java:
##########
@@ -55,6 +56,23 @@ public class SegmentGenerationMetrics
 
   private final AtomicLong maxSegmentHandoffTime = new 
AtomicLong(NO_EMIT_SEGMENT_HANDOFF_TIME);
 
+  // Message gap accounting
+  private final AtomicLong minMessageGap = new AtomicLong(Long.MAX_VALUE);
+  private final AtomicLong maxMessageGap = new AtomicLong(Long.MIN_VALUE);
+  private final AtomicLong numMessageGap = new AtomicLong(0);
+  private final AtomicDouble avgMessageGap = new AtomicDouble(0);

Review Comment:
   ```
       this.avgGapStats.getAndUpdate(oldValue ->
                                         new Pair<>(oldValue.lhs + messageGap, 
oldValue.rhs + 1)
       );
   ```
   since pair values are final I didn't see a way of doing modification 
in-place. The ctor might be the overhead there.



##########
server/src/main/java/org/apache/druid/segment/realtime/SegmentGenerationMetrics.java:
##########
@@ -55,6 +56,23 @@ public class SegmentGenerationMetrics
 
   private final AtomicLong maxSegmentHandoffTime = new 
AtomicLong(NO_EMIT_SEGMENT_HANDOFF_TIME);
 
+  // Message gap accounting
+  private final AtomicLong minMessageGap = new AtomicLong(Long.MAX_VALUE);
+  private final AtomicLong maxMessageGap = new AtomicLong(Long.MIN_VALUE);
+  private final AtomicLong numMessageGap = new AtomicLong(0);
+  private final AtomicDouble avgMessageGap = new AtomicDouble(0);

Review Comment:
   ```java
       this.avgGapStats.getAndUpdate(oldValue ->
                                         new Pair<>(oldValue.lhs + messageGap, 
oldValue.rhs + 1)
       );
   ```
   since pair values are final I didn't see a way of doing modification 
in-place. The ctor might be the overhead there.



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