diff --git a/s3stream/src/main/java/com/automq/stream/s3/S3Storage.java b/s3stream/src/main/java/com/automq/stream/s3/S3Storage.java
index f654df6ee..652b6b593 100644
--- a/s3stream/src/main/java/com/automq/stream/s3/S3Storage.java
+++ b/s3stream/src/main/java/com/automq/stream/s3/S3Storage.java
@@ -82,7 +82,7 @@ public class S3Storage implements Storage {
     private final ScheduledExecutorService backgroundExecutor = Threads.newSingleThreadScheduledExecutor(
             ThreadUtils.createThreadFactory("s3-storage-background", true), LOGGER);
     private final ExecutorService uploadWALExecutor = Threads.newFixedThreadPool(
-            4, ThreadUtils.createThreadFactory("s3-storage-upload-wal", true), LOGGER);
+            4, ThreadUtils.createThreadFactory("s3-storage-upload-wal-%d", true), LOGGER);
 
     private final Queue<WalWriteRequest> backoffRecords = new LinkedBlockingQueue<>();
     private final ScheduledFuture<?> drainBackoffTask;
diff --git a/s3stream/src/main/java/com/automq/stream/s3/operator/DefaultS3Operator.java b/s3stream/src/main/java/com/automq/stream/s3/operator/DefaultS3Operator.java
index 5ebbb738c..42ffb7f87 100644
--- a/s3stream/src/main/java/com/automq/stream/s3/operator/DefaultS3Operator.java
+++ b/s3stream/src/main/java/com/automq/stream/s3/operator/DefaultS3Operator.java
@@ -83,16 +83,19 @@ public class DefaultS3Operator implements S3Operator {
     private final S3AsyncClient readS3Client;
     private final Semaphore inflightWriteLimiter;
     private final Semaphore inflightReadLimiter;
-
     private final List<ReadTask> waitingReadTasks = new LinkedList<>();
     private final AsyncNetworkBandwidthLimiter networkInboundBandwidthLimiter;
     private final AsyncNetworkBandwidthLimiter networkOutboundBandwidthLimiter;
     private final ScheduledExecutorService scheduler = Executors.newSingleThreadScheduledExecutor(
             ThreadUtils.createThreadFactory("s3operator", true));
-    private final ExecutorService s3ReadCallbackExecutor = Executors.newSingleThreadExecutor(
-            ThreadUtils.createThreadFactory("s3-read-cb-executor", true));
-    private final ExecutorService s3WriteCallbackExecutor = Executors.newSingleThreadExecutor(
-            ThreadUtils.createThreadFactory("s3-write-cb-executor", true));
+    private final ExecutorService readLimiterCallbackExecutor = Executors.newSingleThreadExecutor(
+            ThreadUtils.createThreadFactory("s3-read-limiter-cb-executor", true));
+    private final ExecutorService writeLimiterCallbackExecutor = Executors.newSingleThreadExecutor(
+            ThreadUtils.createThreadFactory("s3-write-limiter-cb-executor", true));
+    private final ExecutorService readCallbackExecutor = Executors.newSingleThreadExecutor(
+            ThreadUtils.createThreadFactory("s3-read-cb-executor-%d", true));
+    private final ExecutorService writeCallbackExecutor = Executors.newSingleThreadExecutor(
+            ThreadUtils.createThreadFactory("s3-write-cb-executor-%d", true));
 
     public DefaultS3Operator(String endpoint, String region, String bucket, boolean forcePathStyle, String accessKey, String secretKey) {
         this(endpoint, region, bucket, forcePathStyle, accessKey, secretKey, null, null, false);
@@ -162,7 +165,7 @@ public CompletableFuture<ByteBuf> rangeRead(String path, long start, long end, T
                 } else {
                     rangeRead0(path, start, end, cf);
                 }
-            }, s3ReadCallbackExecutor);
+            }, readLimiterCallbackExecutor);
         } else {
             rangeRead0(path, start, end, cf);
         }
@@ -276,7 +279,7 @@ public CompletableFuture<Void> write(String path, ByteBuf data, ThrottleStrategy
                 } else {
                     write0(path, data, cf);
                 }
-            }, s3WriteCallbackExecutor);
+            }, writeLimiterCallbackExecutor);
         } else {
             write0(path, data, cf);
         }
@@ -402,7 +405,7 @@ public CompletableFuture<CompletedPart> uploadPart(String path, String uploadId,
                 } else {
                     uploadPart0(path, uploadId, partNumber, data, cf);
                 }
-            }, s3WriteCallbackExecutor);
+            }, writeLimiterCallbackExecutor);
         } else {
             uploadPart0(path, uploadId, partNumber, data, cf);
         }
@@ -586,6 +589,7 @@ private static S3AsyncClient newS3Client(String endpoint, String region, boolean
 
     /**
      * Acquire read permit, permit will auto release when cf complete.
+     *
      * @return retCf the retCf should be used as method return value to ensure release before following operations.
      */
     <T> CompletableFuture<T> acquireReadPermit(CompletableFuture<T> cf) {
@@ -595,11 +599,13 @@ <T> CompletableFuture<T> acquireReadPermit(CompletableFuture<T> cf) {
             CompletableFuture<T> newCf = new CompletableFuture<>();
             cf.whenComplete((rst, ex) -> {
                 inflightReadLimiter.release();
-                if (ex != null) {
-                    newCf.completeExceptionally(ex);
-                } else {
-                    newCf.complete(rst);
-                }
+                readCallbackExecutor.execute(() -> {
+                    if (ex != null) {
+                        newCf.completeExceptionally(ex);
+                    } else {
+                        newCf.complete(rst);
+                    }
+                });
             });
             return newCf;
         } catch (InterruptedException e) {
@@ -610,6 +616,7 @@ <T> CompletableFuture<T> acquireReadPermit(CompletableFuture<T> cf) {
 
     /**
      * Acquire write permit, permit will auto release when cf complete.
+     *
      * @return retCf the retCf should be used as method return value to ensure release before following operations.
      */
     <T> CompletableFuture<T> acquireWritePermit(CompletableFuture<T> cf) {
@@ -618,11 +625,13 @@ <T> CompletableFuture<T> acquireWritePermit(CompletableFuture<T> cf) {
             CompletableFuture<T> newCf = new CompletableFuture<>();
             cf.whenComplete((rst, ex) -> {
                 inflightWriteLimiter.release();
-                if (ex != null) {
-                    newCf.completeExceptionally(ex);
-                } else {
-                    newCf.complete(rst);
-                }
+                writeCallbackExecutor.execute(() -> {
+                    if (ex != null) {
+                        newCf.completeExceptionally(ex);
+                    } else {
+                        newCf.complete(rst);
+                    }
+                });
             });
             return newCf;
         } catch (InterruptedException e) {
diff --git a/s3stream/src/main/java/com/automq/stream/s3/operator/MultiPartWriter.java b/s3stream/src/main/java/com/automq/stream/s3/operator/MultiPartWriter.java
index 0091973ce..8c3e662d5 100644
--- a/s3stream/src/main/java/com/automq/stream/s3/operator/MultiPartWriter.java
+++ b/s3stream/src/main/java/com/automq/stream/s3/operator/MultiPartWriter.java
@@ -38,7 +38,7 @@ public class MultiPartWriter implements Writer {
     private static final long MAX_MERGE_WRITE_SIZE = 16L * 1024 * 1024;
     private final S3Operator operator;
     private final String path;
-    private final CompletableFuture<String> uploadIdCf = new CompletableFuture<>();
+    final CompletableFuture<String> uploadIdCf = new CompletableFuture<>();
     private String uploadId;
     private final List<CompletableFuture<CompletedPart>> parts = new LinkedList<>();
     private final AtomicInteger nextPartNumber = new AtomicInteger(1);
diff --git a/s3stream/src/test/java/com/automq/stream/s3/operator/MultiPartWriterTest.java b/s3stream/src/test/java/com/automq/stream/s3/operator/MultiPartWriterTest.java
index 1b3e70e1f..2800221d6 100644
--- a/s3stream/src/test/java/com/automq/stream/s3/operator/MultiPartWriterTest.java
+++ b/s3stream/src/test/java/com/automq/stream/s3/operator/MultiPartWriterTest.java
@@ -54,7 +54,7 @@
 class MultiPartWriterTest {
     private S3AsyncClient s3;
     private DefaultS3Operator operator;
-    private Writer writer;
+    private MultiPartWriter writer;
 
     @BeforeEach
     void setUp() {
@@ -84,6 +84,7 @@ void testWrite() throws NoSuchMethodException, InvocationTargetException, Illega
             return CompletableFuture.completedFuture(builder.build());
         });
         when(s3.completeMultipartUpload(any(CompleteMultipartUploadRequest.class))).thenReturn(CompletableFuture.completedFuture(null));
+        writer.uploadIdCf.get();
 
         List<ByteBuf> payloads = List.of(
                 // case 2