diff --git a/src/storage/buffer/buffer_obj.cpp b/src/storage/buffer/buffer_obj.cpp
index 974aa38dcf..d47545bd89 100644
--- a/src/storage/buffer/buffer_obj.cpp
+++ b/src/storage/buffer/buffer_obj.cpp
@@ -21,6 +21,9 @@ import buffer_manager;
 import infinity_exception;
 import logger;
 
+import third_party;
+import logger;
+
 module buffer_obj;
 
 namespace infinity {
@@ -133,6 +136,7 @@ bool BufferObj::Save() {
     switch (status_) {
         case BufferStatus::kLoaded:
         case BufferStatus::kUnloaded: {
+            LOG_TRACE(Format("{}: Save kEphemeral.", *file_worker_->file_name_));
             file_worker_->WriteToFile(false);
             break;
         }
diff --git a/src/storage/buffer/file_worker/file_worker.cpp b/src/storage/buffer/file_worker/file_worker.cpp
index 43bf875861..aeda24c184 100644
--- a/src/storage/buffer/file_worker/file_worker.cpp
+++ b/src/storage/buffer/file_worker/file_worker.cpp
@@ -22,6 +22,9 @@ import third_party;
 import file_system_type;
 import defer_op;
 
+import local_file_system;
+import logger;
+
 module file_worker;
 
 namespace infinity {
@@ -52,6 +55,10 @@ void FileWorker::WriteToFile(bool to_spill) {
 
     u8 flags = FileFlags::WRITE_FLAG | FileFlags::CREATE_FLAG;
     file_handler_ = fs.OpenFile(write_path, flags, FileLockType::kWriteLock);
+    if (to_spill) {
+        auto local_file_handle_ = static_cast<LocalFileHandler *>(file_handler_.get());
+        LOG_WARN(Format("Open spill file: {}, fd: {}", write_path, local_file_handle_->fd_));
+    }
     bool prepare_success = false;
     DeferFn defer_fn([&]() {
         if (!prepare_success) {
diff --git a/src/storage/io/local_file_system.cpp b/src/storage/io/local_file_system.cpp
index 0d30030a05..01b18bd780 100644
--- a/src/storage/io/local_file_system.cpp
+++ b/src/storage/io/local_file_system.cpp
@@ -128,7 +128,7 @@ i64 LocalFileSystem::Write(FileHandler &file_handler, const void *data, u64 nbyt
     i32 fd = ((LocalFileHandler &)file_handler).fd_;
     i64 write_count = write(fd, data, nbytes);
     if (write_count == -1) {
-        Error<StorageException>(Format("Can't write file: {}: {}", file_handler.path_.string(), strerror(errno)));
+        Error<StorageException>(Format("Can't write file: {}: {}. fd: {}", file_handler.path_.string(), strerror(errno), fd));
     }
     return write_count;
 }
diff --git a/src/storage/io/local_file_system.cppm b/src/storage/io/local_file_system.cppm
index 049720f966..80fe7f99fc 100644
--- a/src/storage/io/local_file_system.cppm
+++ b/src/storage/io/local_file_system.cppm
@@ -22,7 +22,7 @@ export module local_file_system;
 
 namespace infinity {
 
-class LocalFileHandler : public FileHandler {
+export class LocalFileHandler : public FileHandler {
 public:
     LocalFileHandler(FileSystem &file_system, String path, i32 fd) : FileHandler(file_system, Move(path)), fd_(fd) {}