steveloughran commented on code in PR #5308:
URL: https://github.com/apache/hadoop/pull/5308#discussion_r1093465515


##########
hadoop-tools/hadoop-distcp/src/main/java/org/apache/hadoop/tools/DistCpConstants.java:
##########
@@ -142,6 +142,13 @@ private DistCpConstants() {
       "distcp.blocks.per.chunk";
 
   public static final String CONF_LABEL_USE_ITERATOR = "distcp.use.iterator";
+
+  /** Distcp -update to use modification time of source and target file to
+   * check while skipping.
+   */
+  public static final String CONF_LABEL_UPDATE_MOD_TIME =

Review Comment:
   1. javadoc to include {@value}
   2. distcp docs to explain the option



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