fix: increase file download buffer size (#1395)

Author: MikeDombo

src/main/java/com/aws/greengrass/componentmanager/Unarchiver.java

@@ -38,6 +38,9 @@ public void unarchive(Unarchive method, File toUnarchive, Path unarchiveInto) th
     static void unzip(File zipFile, File destDir) throws IOException {
         try (ZipFile zf = new ZipFile(zipFile)) {
             Enumeration<? extends ZipEntry> entries = zf.entries();
+            // IOUtils uses a 4K buffer by default. Using 64K will make things go faster.
+            byte[] buffer = new byte[1024 * 64];
+
             while (entries.hasMoreElements()) {
                 ZipEntry zipEntry = entries.nextElement();
                 File newFile = safeNewZipFile(destDir, zipEntry);
@@ -52,7 +55,7 @@ static void unzip(File zipFile, File destDir) throws IOException {
                                 StandardOpenOption.TRUNCATE_EXISTING,
                                 StandardOpenOption.SYNC);
                              InputStream is = zf.getInputStream(zipEntry)) {
-                            IOUtils.copy(is, fos);
+                            IOUtils.copyLarge(is, fos, buffer);
                         }
                     }
                 }

src/main/java/com/aws/greengrass/componentmanager/builtins/ArtifactDownloader.java

@@ -40,7 +40,8 @@ public abstract class ArtifactDownloader {
     protected static final String HTTP_RANGE_HEADER_KEY = "Range";
     static final String ARTIFACT_DOWNLOAD_EXCEPTION_FMT =
             "Failed to download artifact name: '%s' for component %s-%s, reason: ";
-    private static final int DOWNLOAD_BUFFER_SIZE = 1024;
+    private static final int DOWNLOAD_BUFFER_SIZE = 1024 * 64; // Download/write with 64KB buffer
+    private static final int READ_BUFFER_SIZE = 8192;
     protected final Logger logger;
     protected final ComponentIdentifier identifier;
     protected final ComponentArtifact artifact;
@@ -64,7 +65,7 @@ protected ArtifactDownloader(ComponentIdentifier identifier, ComponentArtifact a
 
     private void updateDigestFromFile(Path filePath, MessageDigest digest) throws IOException {
         try (InputStream existingArtifact = Files.newInputStream(filePath)) {
-            byte[] buffer = new byte[DOWNLOAD_BUFFER_SIZE];
+            byte[] buffer = new byte[READ_BUFFER_SIZE];
             int readBytes = existingArtifact.read(buffer);
             while (readBytes > -1) {
                 digest.update(buffer, 0, readBytes);