keith-turner commented on code in PR #4160:
URL: https://github.com/apache/accumulo/pull/4160#discussion_r1451606732


##########
core/src/main/java/org/apache/accumulo/core/fate/accumulo/FateMutatorImpl.java:
##########
@@ -105,13 +108,20 @@ public FateMutator<T> putTxInfo(TxInfo txInfo, byte[] 
data) {
       case RETURN_VALUE:
         putReturnValue(data);
         break;
+      default:
+        throw new IllegalArgumentException("Unexpected TxInfo type " + txInfo);
     }
     return this;
   }
 
   @Override
   public FateMutator<T> putRepo(int position, Repo<T> repo) {
-    mutation.put(RepoColumnFamily.NAME, invertRepo(position), new 
Value(serialize(repo)));
+    final Text cq = invertRepo(position);
+    // ensure this repo is not already set
+    mutation.addCondition(new Condition(RepoColumnFamily.NAME, cq));

Review Comment:
   We could add a stronger check that ensure the current max repo in storage is 
`position - 1`.  This could be done with a specialized iterator.  Or could have 
to conditions like :
   
    * A condition that checks position is absent
    * A condition that checks that position -1 is present.



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