johnclara commented on a change in pull request #1767:
URL: https://github.com/apache/iceberg/pull/1767#discussion_r523809208



##########
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:
       Makes sense!




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