jerrypeng commented on a change in pull request #11343:
URL: https://github.com/apache/pulsar/pull/11343#discussion_r671434885



##########
File path: 
pulsar-common/src/main/java/org/apache/pulsar/common/nar/NarUnpacker.java
##########
@@ -136,27 +146,27 @@ private static void makeFile(final InputStream 
inputStream, final File file) thr
     }
 
     /**
-     * Calculates an md5 sum of the specified file.
+     * Calculates an sha256 sum of the specified file.
      *
      * @param file
-     *            to calculate the md5sum of
-     * @return the md5sum bytes
+     *            to calculate the sha256 of
+     * @return the sha256 bytes
      * @throws IOException
      *             if cannot read file
      */
-    private static byte[] calculateMd5sum(final File file) throws IOException {
+    private static byte[] calculateSha256Sum(final File file) throws 
IOException {

Review comment:
       What is the reason we need to change to SHA-256?  




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