diff --git a/core/src/main/java/kafka/automq/backpressure/DefaultBackPressureManager.java b/core/src/main/java/kafka/automq/backpressure/DefaultBackPressureManager.java
index 5321670302..3a95a98be3 100644
--- a/core/src/main/java/kafka/automq/backpressure/DefaultBackPressureManager.java
+++ b/core/src/main/java/kafka/automq/backpressure/DefaultBackPressureManager.java
@@ -16,13 +16,15 @@
 
 import com.automq.stream.utils.ThreadUtils;
 import com.automq.stream.utils.Threads;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
 import java.util.HashMap;
 import java.util.Map;
 import java.util.Set;
 import java.util.concurrent.ScheduledExecutorService;
 import java.util.concurrent.TimeUnit;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
 import static kafka.automq.backpressure.BackPressureConfig.RECONFIGURABLE_CONFIGS;
 
diff --git a/core/src/main/scala/kafka/log/stream/s3/DefaultS3Client.java b/core/src/main/scala/kafka/log/stream/s3/DefaultS3Client.java
index 716a3adfbb..2b17455c4f 100644
--- a/core/src/main/scala/kafka/log/stream/s3/DefaultS3Client.java
+++ b/core/src/main/scala/kafka/log/stream/s3/DefaultS3Client.java
@@ -11,9 +11,6 @@
 
 package kafka.log.stream.s3;
 
-import com.automq.stream.s3.backpressure.BackPressureManager;
-import com.automq.stream.s3.backpressure.DefaultBackPressureManager;
-import com.automq.stream.s3.backpressure.Regulator;
 import kafka.autobalancer.metricsreporter.metric.Derivator;
 import kafka.log.stream.s3.metadata.StreamMetadataManager;
 import kafka.log.stream.s3.network.ControllerRequestSender;
diff --git a/s3stream/src/main/java/com/automq/stream/utils/ThreadUtils.java b/s3stream/src/main/java/com/automq/stream/utils/ThreadUtils.java
index 5619311bff..805253b5e0 100644
--- a/s3stream/src/main/java/com/automq/stream/utils/ThreadUtils.java
+++ b/s3stream/src/main/java/com/automq/stream/utils/ThreadUtils.java
@@ -11,13 +11,15 @@
 
 package com.automq.stream.utils;
 
-import io.netty.util.concurrent.FastThreadLocalThread;
+import org.slf4j.Logger;
+import org.slf4j.helpers.NOPLogger;
+
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.ThreadFactory;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicLong;
-import org.slf4j.Logger;
-import org.slf4j.helpers.NOPLogger;
+
+import io.netty.util.concurrent.FastThreadLocalThread;
 
 /**
  * Utilities for working with threads.