johnclara commented on a change in pull request #1767:
URL: https://github.com/apache/iceberg/pull/1767#discussion_r523400902



##########
File path: aws/src/main/java/org/apache/iceberg/aws/s3/S3OutputStream.java
##########
@@ -69,14 +132,54 @@ public void flush() throws IOException {
 
   @Override
   public void write(int b) throws IOException {
+    if (stream.getCount() >= multiPartSize) {
+      newStream();
+      uploadParts();
+    }
+
     stream.write(b);
     pos += 1;
   }
 
   @Override
   public void write(byte[] b, int off, int len) throws IOException {
-    stream.write(b, off, len);
+    int remaining = len;
+    int relativeOffset = off;
+
+    // Write the remainder of the part size to the staging file
+    // and continue to write new staging files if the write is
+    // larger than the part size.
+    while (stream.getCount() + remaining > multiPartSize) {
+      int writeSize = multiPartSize - (int) stream.getCount();

Review comment:
       maybe also try to initialize the multipart upload up here so that the 
individual parts can get kicked off immediately during the loop? or at the 
beginning of the method?
   
   (That currently returns immediately if this is the first chunk right?)




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