[Fix] 이미지 비동기 설정 수정

src/main/java/com/jeju/nanaland/domain/common/service/FileService.java

@@ -7,6 +7,8 @@
 import java.io.File;
 import java.io.FileOutputStream;
 import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
 import java.nio.file.Files;
 import java.util.UUID;
 import lombok.RequiredArgsConstructor;
@@ -19,6 +21,7 @@
 @RequiredArgsConstructor
 public class FileService {
   private final String tmpLocation = System.getProperty("java.io.tmpdir");
+  private static final int BUFFER_SIZE = 8192;
 
   public File convertMultipartFileToFile(MultipartFile multipartFile) {
     String originalFilename = multipartFile.getOriginalFilename();
@@ -29,8 +32,13 @@ public File convertMultipartFileToFile(MultipartFile multipartFile) {
     File convertFile = new File(
         tmpLocation + File.separator + UUID.randomUUID() + "_" + fileName);
 
-    try (FileOutputStream fileOutputStream = new FileOutputStream(convertFile)) {
-      fileOutputStream.write(multipartFile.getBytes());
+    try (InputStream inputStream = multipartFile.getInputStream();
+        OutputStream outputStream = new FileOutputStream(convertFile)) {
+      byte[] buffer = new byte[BUFFER_SIZE];
+      int bytesRead;
+      while ((bytesRead = inputStream.read(buffer)) != -1) {
+        outputStream.write(buffer, 0, bytesRead);
+      }
     } catch (IOException e) {
       throw new ServerErrorException(FILE_FAIL_ERROR.getMessage());
     }

src/main/java/com/jeju/nanaland/global/config/AsyncConfig.java

@@ -32,9 +32,9 @@ public Executor imageUploadExecutor() {
     ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
 
     executor.setThreadGroupName("imageUploadExecutor");
-    executor.setCorePoolSize(10);
-    executor.setMaxPoolSize(20);
-    executor.setQueueCapacity(50);
+    executor.setCorePoolSize(2);
+    executor.setMaxPoolSize(5);
+    executor.setQueueCapacity(10);
     executor.setKeepAliveSeconds(20);
     executor.setThreadNamePrefix("Async ImageUploadExecutor-");
     executor.setRejectedExecutionHandler((r, exec) -> {

src/main/java/com/jeju/nanaland/global/util/CustomMultipartFile.java

@@ -1,9 +1,13 @@
 package com.jeju.nanaland.global.util;
 
+import java.io.BufferedInputStream;
+import java.io.BufferedOutputStream;
 import java.io.File;
 import java.io.FileInputStream;
+import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
+import java.io.OutputStream;
 import java.nio.file.Files;
 import lombok.AllArgsConstructor;
 import org.springframework.web.multipart.MultipartFile;
@@ -15,6 +19,7 @@ public class CustomMultipartFile implements MultipartFile {
   private final String name;
   private final String originalFilename;
   private final String contentType;
+  private static final int BUFFER_SIZE = 8192;
 
   @Override
   public String getName() {
@@ -48,11 +53,18 @@ public byte[] getBytes() throws IOException {
 
   @Override
   public InputStream getInputStream() throws IOException {
-    return new FileInputStream(file);
+    return new BufferedInputStream(new FileInputStream(file), BUFFER_SIZE);
   }
 
   @Override
   public void transferTo(File dest) throws IOException, IllegalStateException {
-    Files.copy(file.toPath(), dest.toPath());
+    try (InputStream in = getInputStream();
+        OutputStream out = new BufferedOutputStream(new FileOutputStream(dest), BUFFER_SIZE)) {
+      byte[] buffer = new byte[BUFFER_SIZE];
+      int bytesRead;
+      while ((bytesRead = in.read(buffer)) != -1) {
+        out.write(buffer, 0, bytesRead);
+      }
+    }
   }
 }