Github user tillrohrmann commented on a diff in the pull request:

    https://github.com/apache/flink/pull/1153#discussion_r41024851
  
    --- Diff: 
flink-runtime/src/main/java/org/apache/flink/runtime/checkpoint/CheckpointCoordinator.java
 ---
    @@ -110,61 +120,68 @@
     
        public CheckpointCoordinator(
                        JobID job,
    -                   int numSuccessfulCheckpointsToRetain,
                        long checkpointTimeout,
                        ExecutionVertex[] tasksToTrigger,
                        ExecutionVertex[] tasksToWaitFor,
                        ExecutionVertex[] tasksToCommitTo,
    -                   ClassLoader userClassLoader) {
    +                   ClassLoader userClassLoader,
    +                   CheckpointIDCounter checkpointIDCounter,
    +                   CompletedCheckpoints completedCheckpoints,
    +                   RecoveryMode recoveryMode) throws Exception {
                
                // some sanity checks
                if (job == null || tasksToTrigger == null ||
                                tasksToWaitFor == null || tasksToCommitTo == 
null) {
                        throw new NullPointerException();
                }
    -           if (numSuccessfulCheckpointsToRetain < 1) {
    -                   throw new IllegalArgumentException("Must retain at 
least one successful checkpoint");
    -           }
                if (checkpointTimeout < 1) {
                        throw new IllegalArgumentException("Checkpoint timeout 
must be larger than zero");
                }
                
                this.job = job;
    --- End diff --
    
    Maybe we could harmonize the null checking as you've done it.


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