smengcl commented on code in PR #8920:
URL: https://github.com/apache/hadoop/pull/8920#discussion_r4475559996


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hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/v2/app/job/impl/TaskAttemptImpl.java:
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@@ -1877,7 +1878,10 @@ protected String resolveHost(String src) {
     Pattern.compile("\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}");
   
   protected boolean isIP(String src) {
-    return ipPattern.matcher(src).matches();
+    // InetAddresses alone also covers IPv4, but it rejects leading zero 
octets such as
+    // "010.1.1.1", which the regex accepts and resolveHost() resolves. Keep 
the regex so

Review Comment:
   Thanks, dropped the regex. `isIP` now calls 
`InetAddresses.isInetAddress(src)` directly (f9cda252745).
   
   _🤖 Addressed by [Claude Code](https://claude.com/claude-code)_



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