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From gauravgopi123 <...@git.apache.org>
Subject [GitHub] incubator-apex-core pull request: APEXCORE-60 Iteration support in...
Date Wed, 16 Dec 2015 19:05:26 GMT
Github user gauravgopi123 commented on a diff in the pull request:

    https://github.com/apache/incubator-apex-core/pull/185#discussion_r47818666
  
    --- Diff: engine/src/main/java/com/datatorrent/stram/plan/logical/LogicalPlan.java ---
    @@ -1607,12 +1636,43 @@ else if (stack.contains(successor)) {
           }
           // strongly connected (cycle) if more than one node in stack
           if (connectedIds.size() > 1) {
    -        LOG.debug("detected cycle from node {}: {}", om.name, connectedIds);
    +        LOG.error("detected cycle from node {}: {}", om.name, connectedIds);
             cycles.add(connectedIds);
           }
         }
       }
     
    +  public void findInvalidDelays(OperatorMeta om, List<List<String>> invalidDelays)
    +  {
    +    stack.push(om);
    +
    +    // depth first successors traversal
    +    boolean isDelayOperator = om.getOperator() instanceof Operator.DelayOperator;
    +    if (isDelayOperator) {
    +      if (om.getValue(OperatorContext.APPLICATION_WINDOW_COUNT) != 1) {
    +        LOG.error("detected DelayOperator having APPLICATION_WINDOW_COUNT not equal to
1");
    +        invalidDelays.add(Collections.singletonList(om.getName()));
    +      }
    +    }
    +
    +    for (StreamMeta downStream: om.outputStreams.values()) {
    +      for (InputPortMeta sink : downStream.sinks) {
    +        OperatorMeta successor = sink.getOperatorWrapper();
    +        if (isDelayOperator) {
    +          // Check whether all downstream operators are already visited in the path
    +          if (successor != null && !stack.contains(successor)) {
    --- End diff --
    
    I have a dag A->D where A is an operator and D is delay Operator. This is valid dag.
If findInvalidDelays is called with D's meta then !stack.contains(successor) will fail.


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