diff --git a/pom.xml b/pom.xml
index f9372182..0cb56e50 100644
--- a/pom.xml
+++ b/pom.xml
@@ -6,7 +6,7 @@
 
     <groupId>com.qcloud.cos</groupId>
     <artifactId>hadoop-cos</artifactId>
-    <version>5.9.6</version>
+    <version>5.10.0</version>
     <packaging>jar</packaging>
 
     <name>Apache Hadoop Tencent Qcloud COS Support</name>
@@ -41,7 +41,7 @@
         <maven.compiler.source>1.7</maven.compiler.source>
         <maven.compiler.target>1.7</maven.compiler.target>
         <hadoop.version>3.3.0</hadoop.version>
-        <cos_api.version>5.6.42</cos_api.version>
+        <cos_api.version>5.6.60</cos_api.version>
         <google.guava.version>24.1.1-jre</google.guava.version>
         <commons_lang3.version>3.1</commons_lang3.version>
         <junit.version>4.8</junit.version>
diff --git a/src/main/java/org/apache/hadoop/fs/CosFileSystem.java b/src/main/java/org/apache/hadoop/fs/CosFileSystem.java
index 31491ce1..36c94970 100644
--- a/src/main/java/org/apache/hadoop/fs/CosFileSystem.java
+++ b/src/main/java/org/apache/hadoop/fs/CosFileSystem.java
@@ -440,9 +440,15 @@ public FileStatus getFileStatus(Path f) throws IOException {
         if (!key.endsWith(PATH_DELIMITER)) {
             key += PATH_DELIMITER;
         }
-        LOG.debug("List the cos key [{}] to judge whether it is a directory or not.", key);
+
+        int maxKeys = this.getConf().getInt(
+                CosNConfigKeys.FILESTATUS_LIST_MAX_KEYS,
+                CosNConfigKeys.DEFAULT_FILESTATUS_LIST_MAX_KEYS
+        );
+
+        LOG.debug("List the cos key [{}] to judge whether it is a directory or not. max keys [{}]", key, maxKeys);
         CosNResultInfo listInfo = new CosNResultInfo();
-        CosNPartialListing listing = store.list(key, 1, listInfo);
+        CosNPartialListing listing = store.list(key, maxKeys, listInfo);
         if (listing.getFiles().length > 0 || listing.getCommonPrefixes().length > 0) {
             LOG.debug("List the cos key [{}] to find that it is a directory.", key);
             return newDirectory(absolutePath);
diff --git a/src/main/java/org/apache/hadoop/fs/CosNConfigKeys.java b/src/main/java/org/apache/hadoop/fs/CosNConfigKeys.java
index 18e794fe..d0032a34 100644
--- a/src/main/java/org/apache/hadoop/fs/CosNConfigKeys.java
+++ b/src/main/java/org/apache/hadoop/fs/CosNConfigKeys.java
@@ -11,7 +11,7 @@
 @InterfaceStability.Unstable
 public class CosNConfigKeys extends CommonConfigurationKeys {
     public static final String USER_AGENT = "fs.cosn.user.agent";
-    public static final String DEFAULT_USER_AGENT = "cos-hadoop-plugin-v5.9.7";
+    public static final String DEFAULT_USER_AGENT = "cos-hadoop-plugin-v5.10.0";
 
     public static final String TENCENT_EMR_VERSION_KEY = "fs.emr.version";
 
@@ -75,6 +75,14 @@ public class CosNConfigKeys extends CommonConfigurationKeys {
     public static final String READ_AHEAD_QUEUE_SIZE = "fs.cosn.read.ahead.queue.size";
     public static final int DEFAULT_READ_AHEAD_QUEUE_SIZE = 8;
 
+    // used to control getFileStatus list to judge dir whether exist.
+    public static final String FILESTATUS_LIST_MAX_KEYS = "fs.cosn.filestatus.list_max_keys";
+    public static final int DEFAULT_FILESTATUS_LIST_MAX_KEYS = 2;
+
+    // used for double check complete mpu in case of return cos client exception but status is 200 ok.
+    public static final String COSN_COMPLETE_MPU_CHECK = "fs.cosn.complete.mpu.check";
+    public static final boolean DEFAULT_COSN_COMPLETE_MPU_CHECK_ENABLE = true;
+
     public static final String MAX_CONNECTION_NUM = "fs.cosn.max.connection.num";
     public static final int DEFAULT_MAX_CONNECTION_NUM = 2048;
 
diff --git a/src/main/java/org/apache/hadoop/fs/CosNativeFileSystemStore.java b/src/main/java/org/apache/hadoop/fs/CosNativeFileSystemStore.java
index 40fe861f..690f4aea 100644
--- a/src/main/java/org/apache/hadoop/fs/CosNativeFileSystemStore.java
+++ b/src/main/java/org/apache/hadoop/fs/CosNativeFileSystemStore.java
@@ -4,6 +4,7 @@
 import com.qcloud.cos.ClientConfig;
 import com.qcloud.cos.exception.CosClientException;
 import com.qcloud.cos.exception.CosServiceException;
+import com.qcloud.cos.exception.ResponseNotCompleteException;
 import com.qcloud.cos.http.HttpProtocol;
 import com.qcloud.cos.internal.SkipMd5CheckStrategy;
 import com.qcloud.cos.model.*;
@@ -47,6 +48,7 @@ public class CosNativeFileSystemStore implements NativeFileSystemStore {
     private int maxRetryTimes;
     private int trafficLimit;
     private boolean crc32cEnabled;
+    private boolean completeMPUCheckEnabled;
     private CosNEncryptionSecrets encryptionSecrets;
     private CustomerDomainEndpointResolver customerDomainEndpointResolver;
 
@@ -104,6 +106,9 @@ private void initCOSClient(URI uri, Configuration conf) throws IOException {
         this.crc32cEnabled = conf.getBoolean(CosNConfigKeys.CRC32C_CHECKSUM_ENABLED,
                 CosNConfigKeys.DEFAULT_CRC32C_CHECKSUM_ENABLED);
 
+        this.completeMPUCheckEnabled = conf.getBoolean(CosNConfigKeys.COSN_COMPLETE_MPU_CHECK,
+                CosNConfigKeys.DEFAULT_COSN_COMPLETE_MPU_CHECK_ENABLE);
+
         // Proxy settings
         String httpProxyIp = conf.getTrimmed(CosNConfigKeys.HTTP_PROXY_IP);
         int httpProxyPort = conf.getInt(CosNConfigKeys.HTTP_PROXY_PORT, CosNConfigKeys.DEFAULT_HTTP_PROXY_PORT);
@@ -1106,8 +1111,6 @@ private <X> void callCOSClientWithSSECOS(X request, ObjectMetadata objectMetadat
                 ((CopyObjectRequest) request).setNewObjectMetadata(objectMetadata);
             } else if (request instanceof InitiateMultipartUploadRequest) {
                 ((InitiateMultipartUploadRequest) request).setObjectMetadata(objectMetadata);
-            } else {
-                throw new IOException("Set SSE_COS request no such method");
             }
         } catch (Exception e) {
             String errMsg =
@@ -1132,8 +1135,6 @@ private <X> void callCOSClientWithSSEC(X request, SSECustomerKey sseKey) {
                 ((GetObjectRequest) request).setSSECustomerKey(sseKey);
             } else if (request instanceof InitiateMultipartUploadRequest) {
                 ((InitiateMultipartUploadRequest) request).setSSECustomerKey(sseKey);
-            } else {
-                throw new IOException("Set SSE_C request no such method");
             }
         } catch (Exception e) {
             String errMsg =
@@ -1260,12 +1261,24 @@ private <X> Object callCOSClientWithRetry(X request) throws CosServiceException,
                 } else {
                     throw new IOException("no such method");
                 }
+            } catch (ResponseNotCompleteException nce) {
+                if  (this.completeMPUCheckEnabled && request instanceof  CompleteMultipartUploadRequest) {
+                    String key = ((CompleteMultipartUploadRequest) request).getKey();
+                    FileMetadata fileMetadata = this.queryObjectMetadata(key);
+                    if (null == fileMetadata) {
+                        // if file not exist must throw the exception.
+                        handleException(nce, key);
+                    }
+                    LOG.warn("Complete mpu resp not complete key [{}]", key);
+                    // todo: some other double check after cgi unified the ctime of mpu.
+                } else {
+                    throw new IOException(nce);
+                }
             } catch (CosServiceException cse) {
                 String errMsg = String.format(
                         "all cos sdk failed, retryIndex: [%d / %d], call " +
                                 "method: %s, exception: %s",
-                        retryIndex, this.maxRetryTimes, sdkMethod,
-                        cse.toString());
+                        retryIndex, this.maxRetryTimes, sdkMethod, cse.toString());
                 int statusCode = cse.getStatusCode();
                 String errorCode = cse.getErrorCode();
                 LOG.debug("fail to retry statusCode {}, errorCode {}", statusCode, errorCode);
diff --git a/src/main/java/org/apache/hadoop/fs/NativeFileSystemStore.java b/src/main/java/org/apache/hadoop/fs/NativeFileSystemStore.java
index 71bca390..beb6b51e 100644
--- a/src/main/java/org/apache/hadoop/fs/NativeFileSystemStore.java
+++ b/src/main/java/org/apache/hadoop/fs/NativeFileSystemStore.java
@@ -30,6 +30,8 @@ void storeFile(String key, InputStream inputStream, byte[] md5Hash,
 
     void storeEmptyFile(String key) throws IOException;
 
+    // must notice some mpu chunk error might have double head check.
+    // which means some times CompleteMultipartUploadResult might be null.
     CompleteMultipartUploadResult completeMultipartUpload(String key,
                                                           String uploadId,
                                                           List<PartETag> partETagList) throws IOException;