Jackie-Jiang commented on code in PR #13668:
URL: https://github.com/apache/pinot/pull/13668#discussion_r1715806024


##########
pinot-core/src/main/java/org/apache/pinot/core/data/manager/realtime/IngestionDelayTracker.java:
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@@ -214,7 +230,7 @@ private long getPartitionOffsetLag(IngestionOffsets offset) 
{
    *
    * @param partitionGroupId partition ID which we should stop tracking.
    */
-  private void removePartitionId(int partitionGroupId) {
+  private synchronized void removePartitionId(int partitionGroupId) {

Review Comment:
   After some consideration, I've updated the code to use the existing 
concurrent map to sync the metrics update/removal. This way the overhead is 
minimal, and I've merged the 2 maps into 1 to further reduce the overhead.



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