Zakelly commented on code in PR #26451:
URL: https://github.com/apache/flink/pull/26451#discussion_r2046326268


##########
flink-core/src/main/java/org/apache/flink/util/TimeUtils.java:
##########
@@ -77,7 +79,14 @@ public static Duration parseDuration(String text) {
         final String unitLabel = 
trimmed.substring(pos).trim().toLowerCase(Locale.US);
 
         if (number.isEmpty()) {
-            throw new NumberFormatException("text does not start with a 
number");
+            try {
+                // Fall back to parse ISO-8601 duration format
+                return Duration.parse(trimmed);

Review Comment:
   I'd be fine with this, since `testParseDurationInvalid` has banned the 
negative number



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