private static StreamOperator<?> getOperatorForDataStream(DataStream<?> dataStream) {
StreamExecutionEnvironment env = dataStream.getExecutionEnvironment();
StreamGraph streamGraph = env.getStreamGraph();
return streamGraph.getStreamNode(dataStream.getId()).getOperator();
}
/**
* Tests union functionality. This ensures that self-unions and unions of streams with differing
* parallelism work.
*
* @throws Exception
*/
@Test
public void testUnion() throws Exception {
StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
env.setParallelism(4);
DataStream<Long> input1 =
env.generateSequence(0, 0)
.map(
new MapFunction<Long, Long>() {
@Override
public Long map(Long value) throws Exception {
return null;
}
});
DataStream<Long> selfUnion =
input1
.union(input1)
.map(
new MapFunction<Long, Long>() {
@Override
public Long map(Long value) throws Exception {
return null;
}
});
DataStream<Long> input6 =
env.generateSequence(0, 0)
.map(
new MapFunction<Long, Long>() {
@Override
public Long map(Long value) throws Exception {
return null;
}
});
DataStream<Long> selfUnionDifferentPartition =
input6
.broadcast()
.union(input6)
.map(
new MapFunction<Long, Long>() {
@Override
public Long map(Long value) throws Exception {
return null;
}
});
DataStream<Long> input2 =
env.generateSequence(0, 0)
.map(
new MapFunction<Long, Long>() {
@Override
public Long map(Long value) throws Exception {
return null;
}
})
.setParallelism(4);
DataStream<Long> input3 =
env.generateSequence(0, 0)
.map(
new MapFunction<Long, Long>() {
@Override
public Long map(Long value) throws Exception {
return null;
}
})
.setParallelism(2);
DataStream<Long> unionDifferingParallelism =
input2
.union(input3)
.map(
new MapFunction<Long, Long>() {
@Override
public Long map(Long value) throws Exception {
return null;
}
})
.setParallelism(4);
DataStream<Long> input4 =
env.generateSequence(0, 0)
.map(
new MapFunction<Long, Long>() {
@Override
public Long map(Long value) throws Exception {
return null;
}
})
.setParallelism(2);
DataStream<Long> input5 =
env.generateSequence(0, 0)
.map(
new MapFunction<Long, Long>() {
@Override
public Long map(Long value) throws Exception {
return null;
}
})
.setParallelism(4);
DataStream<Long> unionDifferingPartitioning =
input4
.broadcast()
.union(input5)
.map(
new MapFunction<Long, Long>() {
@Override
public Long map(Long value) throws Exception {
return null;
}
})
.setParallelism(4);
StreamGraph streamGraph = env.getStreamGraph();
// verify self union
assertTrue(streamGraph.getStreamNode(selfUnion.getId()).getInEdges().size() == 2);
for (StreamEdge edge : streamGraph.getStreamNode(selfUnion.getId()).getInEdges()) {
assertTrue(edge.getPartitioner() instanceof ForwardPartitioner);
}
// verify self union with differnt partitioners
assertTrue(
streamGraph.getStreamNode(selfUnionDifferentPartition.getId()).getInEdges().size() == 2);
boolean hasForward = false;
boolean hasBroadcast = false;
for (StreamEdge edge :
streamGraph.getStreamNode(selfUnionDifferentPartition.getId()).getInEdges()) {
if (edge.getPartitioner() instanceof ForwardPartitioner) {
hasForward = true;
}
if (edge.getPartitioner() instanceof BroadcastPartitioner) {
hasBroadcast = true;
}
}
assertTrue(hasForward && hasBroadcast);
// verify union of streams with differing parallelism
assertTrue(
streamGraph.getStreamNode(unionDifferingParallelism.getId()).getInEdges().size() == 2);
for (StreamEdge edge :
streamGraph.getStreamNode(unionDifferingParallelism.getId()).getInEdges()) {
if (edge.getSourceId() == input2.getId()) {
assertTrue(edge.getPartitioner() instanceof ForwardPartitioner);
} else if (edge.getSourceId() == input3.getId()) {
assertTrue(edge.getPartitioner() instanceof RebalancePartitioner);
} else {
fail("Wrong input edge.");
}
}
// verify union of streams with differing partitionings
assertTrue(
streamGraph.getStreamNode(unionDifferingPartitioning.getId()).getInEdges().size() == 2);
for (StreamEdge edge :
streamGraph.getStreamNode(unionDifferingPartitioning.getId()).getInEdges()) {
if (edge.getSourceId() == input4.getId()) {
assertTrue(edge.getPartitioner() instanceof BroadcastPartitioner);
} else if (edge.getSourceId() == input5.getId()) {
assertTrue(edge.getPartitioner() instanceof ForwardPartitioner);
} else {
fail("Wrong input edge.");
}
}
}