From 874ff4ff2088d99db43a5d689aa61e7be960e31e Mon Sep 17 00:00:00 2001
From: yuxiqian <34335406+yuxiqian@users.noreply.github.com>
Date: Tue, 13 Aug 2024 16:58:05 +0800
Subject: [PATCH] [hotfix][cdc-runtime] Invalidate cache correctly to avoid
 classloader leakage

This closes #3533
---
 .../operators/transform/TransformExpressionCompiler.java     | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/flink-cdc-runtime/src/main/java/org/apache/flink/cdc/runtime/operators/transform/TransformExpressionCompiler.java b/flink-cdc-runtime/src/main/java/org/apache/flink/cdc/runtime/operators/transform/TransformExpressionCompiler.java
index e22d7943d..326ae7ba7 100644
--- a/flink-cdc-runtime/src/main/java/org/apache/flink/cdc/runtime/operators/transform/TransformExpressionCompiler.java
+++ b/flink-cdc-runtime/src/main/java/org/apache/flink/cdc/runtime/operators/transform/TransformExpressionCompiler.java
@@ -39,7 +39,10 @@ public class TransformExpressionCompiler {
 
     /** Triggers internal garbage collection of expired cache entries. */
     public static void cleanUp() {
-        COMPILED_EXPRESSION_CACHE.cleanUp();
+        // com.google.common.cache.Cache from Guava isn't guaranteed to clear all cached records
+        // when invoking Cache#cleanUp, which may cause classloader leakage. Use #invalidateAll
+        // instead to ensure all key / value pairs to be correctly discarded.
+        COMPILED_EXPRESSION_CACHE.invalidateAll();
     }
 
     /** Compiles an expression code to a janino {@link ExpressionEvaluator}. */