[GitHub] [kafka] ijuma commented on a diff in pull request #13078: KAFKA-13999: Add ProducerCount metrics (KIP-847)

["ijuma (via GitHub)" <gi...@apache.org>]

ijuma commented on code in PR #13078:
URL: https://github.com/apache/kafka/pull/13078#discussion_r1103849776


##########
core/src/main/scala/kafka/log/ProducerStateManager.scala:
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@@ -504,7 +520,7 @@ class ProducerStateManager(
    * Truncate the producer id mapping and remove all snapshots. This resets the state of the mapping.
    */
   def truncateFullyAndStartAt(offset: Long): Unit = {
-    producers.clear()
+    removeProducerIds(producers.keySet)

Review Comment:
   It's much cheaper to clear a map than to remove all the keys. It probably makes sense to have a `clearProducerIds` method as well.



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