diff --git a/client/src/main/java/io/streamnative/oxia/client/notify/ShardNotificationReceiver.java b/client/src/main/java/io/streamnative/oxia/client/notify/ShardNotificationReceiver.java
index 38c8b1d5..845ff5af 100644
--- a/client/src/main/java/io/streamnative/oxia/client/notify/ShardNotificationReceiver.java
+++ b/client/src/main/java/io/streamnative/oxia/client/notify/ShardNotificationReceiver.java
@@ -40,6 +40,7 @@
 import lombok.extern.slf4j.Slf4j;
 import reactor.core.Disposable;
 import reactor.core.publisher.Flux;
+import reactor.core.scheduler.Scheduler;
 import reactor.core.scheduler.Schedulers;
 import reactor.util.retry.Retry;
 import reactor.util.retry.RetryBackoffSpec;
@@ -54,6 +55,8 @@ public class ShardNotificationReceiver extends GrpcResponseStream {
     private final @NonNull NotificationMetrics metrics;
     private @NonNull Optional<Long> startingOffset = Optional.empty();
 
+
+    private Scheduler scheduler;
     private long offset;
 
     ShardNotificationReceiver(
@@ -75,6 +78,15 @@ public void start(@NonNull Optional<Long> offset) {
         this.start();
     }
 
+    @Override
+    public void close() {
+        super.close();
+
+        if (scheduler != null) {
+            scheduler.dispose();
+        }
+    }
+
     @Override
     protected @NonNull CompletableFuture<Void> start(
             @NonNull ReactorOxiaClientStub stub, @NonNull Consumer<Disposable> consumer) {
@@ -87,13 +99,14 @@ public void start(@NonNull Optional<Long> offset) {
                                 signal ->
                                         log.warn("Retrying receiving notifications for shard {}: {}", shardId, signal));
         var threadName = String.format("shard-%s-notifications", shardId);
+        scheduler = Schedulers.newSingle(threadName);
         var disposable =
                 Flux.defer(() -> stub.getNotifications(request.build()))
                         .doOnError(t -> log.warn("Error receiving notifications for shard {}", shardId, t))
                         .doOnEach(metrics::recordBatch)
                         .retryWhen(retrySpec)
                         .repeat()
-                        .publishOn(Schedulers.newSingle(threadName))
+                        .publishOn(scheduler)
                         .subscribe(this::notify);
         consumer.accept(disposable);
         return completedFuture(null);
diff --git a/client/src/main/java/io/streamnative/oxia/client/session/Session.java b/client/src/main/java/io/streamnative/oxia/client/session/Session.java
index 8237798d..2cc5680c 100644
--- a/client/src/main/java/io/streamnative/oxia/client/session/Session.java
+++ b/client/src/main/java/io/streamnative/oxia/client/session/Session.java
@@ -33,6 +33,7 @@
 import lombok.extern.slf4j.Slf4j;
 import reactor.core.Disposable;
 import reactor.core.publisher.Mono;
+import reactor.core.scheduler.Scheduler;
 import reactor.core.scheduler.Schedulers;
 import reactor.util.retry.Retry;
 import reactor.util.retry.RetryBackoffSpec;
@@ -55,6 +56,7 @@ public class Session implements AutoCloseable {
     private final @NonNull SessionHeartbeat heartbeat;
     private final @NonNull SessionMetrics metrics;
 
+    private Scheduler scheduler;
     private Disposable keepAliveSubscription;
 
     Session(
@@ -72,6 +74,8 @@ public class Session implements AutoCloseable {
                 sessionId,
                 SessionHeartbeat.newBuilder().setShardId(shardId).setSessionId(sessionId).build(),
                 metrics);
+        var threadName = String.format("session-[id=%s,shard=%s]-keep-alive", sessionId, shardId);
+        scheduler = Schedulers.newSingle(threadName);
     }
 
     void start() {
@@ -84,8 +88,6 @@ void start() {
                                                 sessionId,
                                                 shardId,
                                                 signal));
-        var threadName = String.format("session-[id=%s,shard=%s]-keep-alive", sessionId, shardId);
-
         keepAliveSubscription =
                 Mono.just(heartbeat)
                         .repeat()
@@ -93,7 +95,7 @@ void start() {
                         .flatMap(hb -> stubByShardId.apply(shardId).keepAlive(hb))
                         .retryWhen(retrySpec)
                         .timeout(sessionTimeout)
-                        .publishOn(Schedulers.newSingle(threadName))
+                        .publishOn(scheduler)
                         .doOnEach(metrics::recordKeepAlive)
                         .doOnError(
                                 t -> log.warn("Session keep-alive error: [id={},shard={}]", sessionId, shardId, t))
@@ -107,6 +109,7 @@ public void close() throws Exception {
         var request =
                 CloseSessionRequest.newBuilder().setShardId(shardId).setSessionId(sessionId).build();
         stub.closeSession(request).block();
+        scheduler.dispose();
     }
 
     @RequiredArgsConstructor(access = PACKAGE)
diff --git a/client/src/main/java/io/streamnative/oxia/client/shard/ShardManager.java b/client/src/main/java/io/streamnative/oxia/client/shard/ShardManager.java
index 74cf27cf..27e86e5d 100644
--- a/client/src/main/java/io/streamnative/oxia/client/shard/ShardManager.java
+++ b/client/src/main/java/io/streamnative/oxia/client/shard/ShardManager.java
@@ -57,6 +57,7 @@
 import reactor.core.Disposable;
 import reactor.core.publisher.Flux;
 import reactor.core.publisher.Mono;
+import reactor.core.scheduler.Scheduler;
 import reactor.core.scheduler.Schedulers;
 import reactor.util.retry.Retry;
 import reactor.util.retry.RetryBackoffSpec;
@@ -67,6 +68,8 @@ public class ShardManager extends GrpcResponseStream implements AutoCloseable {
     private final @NonNull CompositeConsumer<ShardAssignmentChanges> callbacks;
     private final @NonNull ShardAssignmentMetrics metrics;
 
+    private final Scheduler scheduler;
+
     @VisibleForTesting
     ShardManager(
             @NonNull Supplier<ReactorOxiaClientStub> stubFactory,
@@ -77,6 +80,7 @@ public class ShardManager extends GrpcResponseStream implements AutoCloseable {
         this.assignments = assignments;
         this.callbacks = callbacks;
         this.metrics = metrics;
+        this.scheduler = Schedulers.newSingle("shard-assignments");
     }
 
     public ShardManager(
@@ -90,6 +94,12 @@ public ShardManager(
                 ShardAssignmentMetrics.create(metrics));
     }
 
+    @Override
+    public void close() {
+        super.close();
+        scheduler.dispose();
+    }
+
     @Override
     protected CompletableFuture<Void> start(
             ReactorOxiaClientStub stub, Consumer<Disposable> consumer) {
@@ -107,7 +117,7 @@ protected CompletableFuture<Void> start(
                         .doOnError(this::processError)
                         .retryWhen(retrySpec)
                         .repeat()
-                        .publishOn(Schedulers.newSingle("shard-assignments"))
+                        .publishOn(scheduler)
                         .doOnNext(this::updateAssignments)
                         .doOnEach(metrics::recordAssignments)
                         .publish();