From 824c8a39f146ef3b8c0271ed4d9a4877716081f1 Mon Sep 17 00:00:00 2001
From: Krishna Srinivas <krishna@minio.io>
Date: Thu, 19 May 2016 02:07:28 +0530
Subject: [PATCH] XL/Multipart: If the part is already uploaded ignore the
 newly uploaded part. (#1677)

Fixes #1644
---
 object-common-multipart.go | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/object-common-multipart.go b/object-common-multipart.go
index 8907c0174..824e461e4 100644
--- a/object-common-multipart.go
+++ b/object-common-multipart.go
@@ -205,6 +205,14 @@ func putObjectPartCommon(storage StorageAPI, bucket string, object string, uploa
 
 	partSuffixMD5 := fmt.Sprintf("%.5d.%s", partID, newMD5Hex)
 	partSuffixMD5Path := path.Join(mpartMetaPrefix, bucket, object, uploadID, partSuffixMD5)
+	if _, err = storage.StatFile(minioMetaBucket, partSuffixMD5Path); err == nil {
+		// Part already uploaded as md5sum matches with the previous part.
+		// Just delete the temporary file.
+		if err = storage.DeleteFile(minioMetaBucket, partSuffixPath); err != nil {
+			return "", toObjectErr(err, minioMetaBucket, partSuffixPath)
+		}
+		return newMD5Hex, nil
+	}
 	err = storage.RenameFile(minioMetaBucket, partSuffixPath, minioMetaBucket, partSuffixMD5Path)
 	if err != nil {
 		if derr := storage.DeleteFile(minioMetaBucket, partSuffixPath); derr != nil {