[jira] [Created] (GIRAPH-591) Compute called before initialize in ComputeCallable.computePartition?

["Gianmarco De Francisci Morales (JIRA)" <ji...@apache.org>]

Gianmarco De Francisci Morales created GIRAPH-591:
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             Summary: Compute called before initialize in ComputeCallable.computePartition?
                 Key: GIRAPH-591
                 URL: https://issues.apache.org/jira/browse/GIRAPH-591
             Project: Giraph
          Issue Type: Bug
            Reporter: Gianmarco De Francisci Morales


Hi,
I get the following exception when I try to run my vertex

{code}
java.lang.NullPointerException at org.apache.giraph.examples.RandomWalkVertex.getDanglingProbability(RandomWalkVertex.java:90) at org.apache.giraph.examples.RandomWalkWithRestartVertex.recompute(RandomWalkWithRestartVertex.java:72) at org.apache.giraph.examples.RandomWalkVertex.compute(RandomWalkVertex.java:100) at org.apache.giraph.graph.ComputeCallable.computePartition(ComputeCallable.java:222) at org.apache.giraph.graph.ComputeCallable.call(ComputeCallable.java:156) at org.apache.giraph.graph.ComputeCallable.call(ComputeCallable.java:69) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334) at java.util.concurrent.FutureTask.run(FutureTask.java:166) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) at java.lang.Thread.run(Thread.java:722) 
{code}

The code is the following:
{code}
  protected double getDanglingProbability() {
    return this.<DoubleWritable>getAggregatedValue(
        RandomWalkVertex.CUMULATIVE_DANGLING_PROBABILITY).get();
  }
{code}

>From which I infer that the aggregator has not been initialized. However, the initialize method is as follows:

{code}
    public void initialize() throws InstantiationException,
        IllegalAccessException {
      registerAggregator(RandomWalkVertex.CUMULATIVE_DANGLING_PROBABILITY,
          DoubleSumAggregator.class);
      registerAggregator(RandomWalkVertex.L1_NORM_OF_PROBABILITY_DIFFERENCE,
          DoubleSumAggregator.class);
    }
{code}

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