From 9533db1cfe9ab77a4abb533df5a6ed665f59ead7 Mon Sep 17 00:00:00 2001
From: Rui Fan <1996fanrui@gmail.com>
Date: Mon, 31 Aug 2026 18:43:55 +0200
Subject: [PATCH] [FLINK-40523][network] Compute tracePersist debug string only
 when trace logging is enabled

---
 .../flink/runtime/io/network/logger/NetworkActionsLogger.java | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/flink-runtime/src/main/java/org/apache/flink/runtime/io/network/logger/NetworkActionsLogger.java b/flink-runtime/src/main/java/org/apache/flink/runtime/io/network/logger/NetworkActionsLogger.java
index 137334ae14fc35..231fbcbb2a07ad 100644
--- a/flink-runtime/src/main/java/org/apache/flink/runtime/io/network/logger/NetworkActionsLogger.java
+++ b/flink-runtime/src/main/java/org/apache/flink/runtime/io/network/logger/NetworkActionsLogger.java
@@ -98,7 +98,9 @@ public static void traceRecover(
 
     public static void tracePersist(
             String action, Buffer buffer, Object channelInfo, long checkpointId) {
-        tracePersist(action, buffer.toDebugString(INCLUDE_HASH), channelInfo, checkpointId);
+        if (LOG.isTraceEnabled()) {
+            tracePersist(action, buffer.toDebugString(INCLUDE_HASH), channelInfo, checkpointId);
+        }
     }
 
     public static void tracePersist(