From 7bb9b826fb959bd6f915751f1e4aa6f0f7b3bdee Mon Sep 17 00:00:00 2001
From: Raphael Kim <raphk@amazon.com>
Date: Thu, 15 Apr 2021 15:33:56 -0700
Subject: [PATCH] force upload part tasks to be serial

---
 .../s3/transferutility/TransferThreadPool.java                 | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/aws-android-sdk-s3/src/main/java/com/amazonaws/mobileconnectors/s3/transferutility/TransferThreadPool.java b/aws-android-sdk-s3/src/main/java/com/amazonaws/mobileconnectors/s3/transferutility/TransferThreadPool.java
index 3158295c68b..4c41e4050c4 100644
--- a/aws-android-sdk-s3/src/main/java/com/amazonaws/mobileconnectors/s3/transferutility/TransferThreadPool.java
+++ b/aws-android-sdk-s3/src/main/java/com/amazonaws/mobileconnectors/s3/transferutility/TransferThreadPool.java
@@ -41,7 +41,8 @@ static synchronized void init(final int transferThreadPoolSize) {
             executorMainTask = buildExecutor(poolSize);
         }
         if (executorPartTask == null) {
-            executorPartTask = buildExecutor(poolSize);
+            // Upload individual parts serially
+            executorPartTask = buildExecutor(1);
         }
     }