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

    https://github.com/apache/incubator-apex-core/pull/185#discussion_r49281400
  
    --- Diff: 
engine/src/main/java/com/datatorrent/stram/StreamingContainerManager.java ---
    @@ -1917,25 +1930,30 @@ public void updateRecoveryCheckpoints(PTOperator 
operator, UpdateCheckpointsCont
           long currentWindowId = WindowGenerator.getWindowId(ctx.currentTms, 
this.vars.windowStartMillis, 
this.getLogicalPlan().getValue(LogicalPlan.STREAMING_WINDOW_SIZE_MILLIS));
           maxCheckpoint = currentWindowId;
         }
    +    ctx.visited.add(operator);
     
         // DFS downstream operators
    -    for (PTOperator.PTOutput out : operator.getOutputs()) {
    -      for (PTOperator.PTInput sink : out.sinks) {
    -        PTOperator sinkOperator = sink.target;
    -        if (!ctx.visited.contains(sinkOperator)) {
    -          // downstream traversal
    -          updateRecoveryCheckpoints(sinkOperator, ctx);
    -        }
    -        // recovery window id cannot move backwards
    -        // when dynamically adding new operators
    -        if (sinkOperator.getRecoveryCheckpoint().windowId >= 
operator.getRecoveryCheckpoint().windowId) {
    -          maxCheckpoint = Math.min(maxCheckpoint, 
sinkOperator.getRecoveryCheckpoint().windowId);
    -        }
    +    if (operator.getOperatorMeta().getOperator() instanceof 
Operator.DelayOperator) {
    +      addVisited(operator, ctx);
    +    } else {
    --- End diff --
    
    @davidyan74 I have been working on making the recovery checkpoints the same 
in case of iteration or idempotent operators (APEXCORE-279). Please wait for 
the pull request.


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