[jira] [Created] (FLINK-1087) A DeltaIteration fails with Reducer as Input

[Shang Yuanchun (Jira)]

Aljoscha Krettek created FLINK-1087:
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             Summary: A DeltaIteration fails  with Reducer as Input
                 Key: FLINK-1087
                 URL: https://issues.apache.org/jira/browse/FLINK-1087
             Project: Flink
          Issue Type: Bug
            Reporter: Aljoscha Krettek
            Assignee: Stephan Ewen


The following modified WordCount example fails:

{code}
// set up the execution environment
                final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
               
                // get input data
                DataSet<String> text = getTextDataSet(env);
               
                DataSet<Tuple2<String, Integer>> counts =
                                // split up the lines in pairs (2-tuples) containing: (word,1)
                                text.flatMap(new Tokenizer())
                                // group by the tuple field "0" and sum up tuple field "1"
                                .groupBy(0)
                                .sum(1);

                DeltaIteration<Tuple2<String, Integer>, Tuple2<String, Integer>> iteration = counts.iterateDelta(counts, 10, 0);

                DataSet<Tuple2<String, Integer>> delta =
                                iteration.getSolutionSet().join(iteration.getWorkset()).where(0).equalTo(0).with(
                                new JoinFunction<Tuple2<String, Integer>, Tuple2<String, Integer>, Tuple2<String, Integer>>() {

                                        public Tuple2<String, Integer> join(Tuple2<String, Integer> first, Tuple2<String, Integer> second) throws Exception {
                                                return second;
                                        }
                                });

                DataSet<Tuple2<String, Integer>> newWorkset = delta.filter(new FilterFunction<Tuple2<String, Integer>>() {
                        @Override
                        public boolean filter(Tuple2<String, Integer> value) throws Exception {
                                return false;
                        }
                });

                DataSet<Tuple2<String, Integer>> result = iteration.closeWith(delta, newWorkset);
                result.print();

                // execute program
                env.execute("WordCount Example");
{code}

With this Exception:
Exception in thread "main" org.apache.flink.runtime.client.JobExecutionException: java.lang.RuntimeException: Initializing the input streams failed in Task Join(org.apache.flink.api.java.operators.JoinOperator$DefaultJoin$WrappingFlatJoinFunction): Illegal input group size in task configuration: -1
        at org.apache.flink.runtime.operators.RegularPactTask.registerInputOutput(RegularPactTask.java:260)
        at org.apache.flink.runtime.execution.RuntimeEnvironment.<init>(RuntimeEnvironment.java:205)
        at org.apache.flink.runtime.taskmanager.TaskManager.submitTasks(TaskManager.java:775)
        at sun.reflect.GeneratedMethodAccessor5.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:483)
        at org.apache.flink.runtime.ipc.RPC$Server.call(RPC.java:422)
        at org.apache.flink.runtime.ipc.Server$Handler.run(Server.java:958)
Caused by: java.lang.Exception: Illegal input group size in task configuration: -1
        at org.apache.flink.runtime.operators.RegularPactTask.initInputReaders(RegularPactTask.java:739)
        at org.apache.flink.runtime.operators.RegularPactTask.registerInputOutput(RegularPactTask.java:256)
        ... 7 more

        at org.apache.flink.runtime.client.JobClient.submitJobAndWait(JobClient.java:361)
        at org.apache.flink.client.LocalExecutor.executePlan(LocalExecutor.java:245)
        at org.apache.flink.api.java.LocalEnvironment.execute(LocalEnvironment.java:58)
        at org.apache.flink.example.java.wordcount.WordCount.main(WordCount.java:100)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:483)
        at com.intellij.rt.execution.application.AppMain.main(AppMain.java:134)



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