From 4a8c9a42e3184d1ffa0d6cd030ea4f980c0f7067 Mon Sep 17 00:00:00 2001
From: Ryan Bogan <rbogan@amazon.com>
Date: Wed, 18 Sep 2024 15:36:58 -0700
Subject: [PATCH] Add log message for quantization state cache eviction due to
 size (#2120)

Signed-off-by: Ryan Bogan <rbogan@amazon.com>
(cherry picked from commit ccc59b197125ffbba14428310419b0989f0c9bae)
---
 .../models/quantizationState/QuantizationStateCache.java     | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/main/java/org/opensearch/knn/quantization/models/quantizationState/QuantizationStateCache.java b/src/main/java/org/opensearch/knn/quantization/models/quantizationState/QuantizationStateCache.java
index cc5a34bcd..f057026b9 100644
--- a/src/main/java/org/opensearch/knn/quantization/models/quantizationState/QuantizationStateCache.java
+++ b/src/main/java/org/opensearch/knn/quantization/models/quantizationState/QuantizationStateCache.java
@@ -107,6 +107,11 @@ public void evict(String fieldName) {
     private void onRemoval(RemovalNotification<String, QuantizationState> removalNotification) {
         if (RemovalCause.SIZE == removalNotification.getCause()) {
             updateEvictedDueToSizeAt();
+            log.info(
+                "[KNN] Quantization state evicted from cache. Key {}, Reason: {}",
+                removalNotification.getKey(),
+                removalNotification.getCause()
+            );
         }
     }