ctubbsii commented on a change in pull request #337: ACCUMULO-4732 No APIs to 
configure iterators or locality groups for new tables
URL: https://github.com/apache/accumulo/pull/337#discussion_r157092650
 
 

 ##########
 File path: 
core/src/main/java/org/apache/accumulo/core/util/LocalityGroupUtil.java
 ##########
 @@ -340,4 +340,14 @@ public static void seek(FileSKVIterator reader, Range 
range, String lgName, Map<
 
     reader.seek(range, families, inclusive);
   }
+
+  static public void ensureNonOverlappingGroups(Map<String,Set<Text>> groups) {
+    HashSet<Text> all = new HashSet<>();
+    for (Entry<String,Set<Text>> entry : groups.entrySet()) {
+      if (!Collections.disjoint(all, entry.getValue())) {
+        throw new IllegalArgumentException("Group " + entry.getKey() + " 
overlaps with another group");
+      }
+      all.addAll(entry.getValue());
+    }
+  }
 
 Review comment:
   Oh, my mistake. I thought this was `o.a.a.core.client.util`; it's actually 
`o.a.a.core.util`, which is not public API. Never mind :smile:

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