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https://issues.apache.org/jira/browse/FLINK-1343?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14315815#comment-14315815
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Ufuk Celebi commented on FLINK-1343:
------------------------------------
I've just checked this with [#356|https://github.com/apache/flink/pulls/356]
and the deadlock does not occur. I will finalize the PR after some further
tests.
> Branching Join Program Deadlocks
> --------------------------------
>
> Key: FLINK-1343
> URL: https://issues.apache.org/jira/browse/FLINK-1343
> Project: Flink
> Issue Type: Bug
> Components: Optimizer
> Affects Versions: 0.8, 0.9
> Reporter: Fabian Hueske
> Assignee: Fabian Hueske
>
> The following program which gets its data from a single non-parallel data
> source, branches two times, and joins the branches with two joins, deadlocks.
> {code:java}
> public class DeadlockProgram {
> public static void main(String[] args) throws Exception {
> final ExecutionEnvironment env =
> ExecutionEnvironment.getExecutionEnvironment();
> DataSet<Long> longs =
> env.generateSequence(0,1000000l).setParallelism(1);
> DataSet<Long> longs2 = env.generateSequence(0,
> 1000000l).setParallelism(1);
> DataSet<Tuple1<Long>> longT1 = longs.map(new TupleWrapper());
> DataSet<Tuple1<Long>> longT2 = longT1.project(0);
> DataSet<Tuple1<Long>> longT3 = longs.map(new TupleWrapper()); //
> deadlocks
> // DataSet<Tuple1<Long>> longT3 = longs2.map(new TupleWrapper()); //
> works
> longT2.join(longT3).where(0).equalTo(0).projectFirst(0)
> .join(longT1).where(0).equalTo(0).projectFirst(0)
> .print();
> env.execute();
> }
> public static class TupleWrapper implements MapFunction<Long,
> Tuple1<Long>> {
> @Override
> public Tuple1<Long> map(Long l) throws Exception {
> return new Tuple1<Long>(l);
> }
> };
> }
> {code}
> If one of the branches reads its data from a second data source (see inline
> comment) or if the single data source uses the default parallelism, the
> program executes correctly.
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