Bump high water mark when downloading bundle to 16 MB

src/tar.ts

@@ -142,6 +142,13 @@ export async function extractTarZst(
   logger: Logger,
 ): Promise<string> {
   const dest = await createExtractFolder();
+  logger.debug(
+    `Extracting to ${dest}.${
+      tar instanceof stream.Readable
+        ? ` Input stream has high water mark ${tar.readableHighWaterMark}.`
+        : ""
+    }`,
+  );
 
   try {
     // Initialize args

src/tools-download.ts

@@ -1,4 +1,4 @@
-import { IncomingMessage, OutgoingHttpHeaders } from "http";
+import { IncomingMessage, OutgoingHttpHeaders, RequestOptions } from "http";
 import * as path from "path";
 import { performance } from "perf_hooks";
 
@@ -11,6 +11,11 @@ import { formatDuration, Logger } from "./logging";
 import * as tar from "./tar";
 import { cleanUpGlob } from "./util";
 
+/**
+ * High watermark to use when streaming the download and extraction of the CodeQL tools.
+ */
+export const STREAMING_HIGH_WATERMARK_BYTES = 4 * 1024 * 1024; // 4 MiB
+
 /**
  * Timing information for the download and extraction of the CodeQL tools when
  * we fully download the bundle before extracting.
@@ -182,7 +187,14 @@ async function downloadAndExtractZstdWithStreaming(
     headers,
   );
   const response = await new Promise<IncomingMessage>((resolve) =>
-    https.get(codeqlURL, { headers }, (r) => resolve(r)),
+    https.get(
+      codeqlURL,
+      {
+        headers,
+        highWaterMark: STREAMING_HIGH_WATERMARK_BYTES,
+      } as unknown as RequestOptions,
+      (r) => resolve(r),
+    ),
   );
 
   if (response.statusCode !== 200) {