vy commented on code in PR #3469:
URL: https://github.com/apache/logging-log4j2/pull/3469#discussion_r1958798429


##########
log4j-core/src/main/java/org/apache/logging/log4j/core/util/internal/instant/InstantPatternDynamicFormatter.java:
##########
@@ -239,7 +239,11 @@ private static List<PatternSequence> sequencePattern(final 
String pattern) {
                 final PatternSequence sequence;
                 switch (c) {
                     case 's':
-                        sequence = new SecondPatternSequence(true, "", 0);
+                        if (sequenceContent.length() == 2) {
+                            sequence = new SecondPatternSequence(true, "", 0);
+                        } else {
+                            sequence = new 
DynamicPatternSequence(sequenceContent);
+                        }

Review Comment:
   @ppkarwasz, in #3338, you wanted keep the garbage-free behavior for 
subminute precision at the cost of increasing the complexity. I think we can 
still adhere to your motivation by adding a `secondPaddingLength` argument to 
`SecondPatternSequence::new` and updating 
`SecondPatternSequence::formatSeconds` accordingly. I am not keen on creating 
an exception for second patterns that are not padded. WDYT?



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