diqiu50 commented on code in PR #6280:
URL: https://github.com/apache/gravitino/pull/6280#discussion_r1942128922


##########
clients/filesystem-fuse/src/open_dal_filesystem.rs:
##########
@@ -210,19 +227,44 @@ impl FileReader for FileReaderImpl {
 
 struct FileWriterImpl {
     writer: opendal::Writer,
+    buffer: Vec<u8>,
+}
+
+impl FileWriterImpl {
+    fn new(writer: opendal::Writer) -> Self {
+        Self {
+            writer,
+            buffer: Vec::with_capacity(OpenDalFileSystem::WRITE_BUFFER_SIZE + 
4096),
+        }
+    }
 }
 
 #[async_trait]
 impl FileWriter for FileWriterImpl {
     async fn write(&mut self, _offset: u64, data: &[u8]) -> Result<u32> {
-        self.writer
-            .write(data.to_vec())
-            .await
-            .map_err(opendal_error_to_errno)?;
+        if self.buffer.len() > OpenDalFileSystem::WRITE_BUFFER_SIZE {
+            let mut new_buffer: Vec<u8> =
+                Vec::with_capacity(OpenDalFileSystem::WRITE_BUFFER_SIZE + 
4096);
+            new_buffer.append(&mut self.buffer);

Review Comment:
   `new_buffer.append(&mut self.buffer)`  clear the `self.buffer`



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