diff --git a/pom.xml b/pom.xml
index 71b40611..b81e7b74 100644
--- a/pom.xml
+++ b/pom.xml
@@ -6,7 +6,7 @@
 
     <groupId>com.qcloud.cos</groupId>
     <artifactId>hadoop-cos</artifactId>
-    <version>8.2.0</version>
+    <version>8.2.1</version>
     <packaging>jar</packaging>
 
     <name>Apache Hadoop Tencent Cloud COS Support</name>
diff --git a/src/main/java/org/apache/hadoop/fs/cosn/LocalRandomAccessMappedBufferPool.java b/src/main/java/org/apache/hadoop/fs/cosn/LocalRandomAccessMappedBufferPool.java
index eceecb7c..bb4196c2 100644
--- a/src/main/java/org/apache/hadoop/fs/cosn/LocalRandomAccessMappedBufferPool.java
+++ b/src/main/java/org/apache/hadoop/fs/cosn/LocalRandomAccessMappedBufferPool.java
@@ -50,10 +50,14 @@ public synchronized void initialize(Configuration configuration) throws IOExcept
     // 获取用户配置的 POSIX extension 特性目录
     String cacheDirPath = configuration.get(
         CosNConfigKeys.COSN_POSIX_EXTENSION_TMP_DIR, CosNConfigKeys.DEFAULT_POSIX_EXTENSION_TMP_DIR);
-    this.cacheDir = new File(cacheDirPath);
+    // 正式构建 MappedFactory 用于后续创建本地缓存文件
+    boolean deleteOnExit = configuration.getBoolean(
+        CosNConfigKeys.COSN_MAPDISK_DELETEONEXIT_ENABLED, CosNConfigKeys.DEFAULT_COSN_MAPDISK_DELETEONEXIT_ENABLED);
+    this.mappedBufferFactory = new CosNRandomAccessMappedBufferFactory(cacheDirPath, deleteOnExit);
 
+    this.cacheDir = new File(cacheDirPath);
     // 检查当前目录空间是否足够
-    long usableSpace = this.cacheDir.getUsableSpace();
+    long usableSpace = this.cacheDir.getParentFile().getUsableSpace();
     long quotaSize = configuration.getLong(CosNConfigKeys.COSN_POSIX_EXTENSION_TMP_DIR_QUOTA,
         CosNConfigKeys.DEFAULT_COSN_POSIX_EXTENSION_TMP_DIR_QUOTA);
     Preconditions.checkArgument(quotaSize <= usableSpace,
@@ -75,11 +79,6 @@ public synchronized void initialize(Configuration configuration) throws IOExcept
     this.highWaterMarkRemainingSpace = (long) (quotaSize * (1 - highWaterMark));
     this.lowWaterMarkRemainingSpace = (long) (quotaSize * (1 - lowWaterMark));
 
-    // 正式构建 MappedFactory 用于后续创建本地缓存文件
-    boolean deleteOnExit = configuration.getBoolean(
-        CosNConfigKeys.COSN_MAPDISK_DELETEONEXIT_ENABLED, CosNConfigKeys.DEFAULT_COSN_MAPDISK_DELETEONEXIT_ENABLED);
-    this.mappedBufferFactory = new CosNRandomAccessMappedBufferFactory(cacheDirPath, deleteOnExit);
-
     this.referCount.incrementAndGet();
     this.isInitialized.set(true);
   }