Examples with PTInput com.datatorrent.stram.plan.physical.PTOperator.PTInput used on opensource projects

Example 1 with PTInput

use of com.datatorrent.stram.plan.physical.PTOperator.PTInput in project apex-core by apache.

the class PhysicalPlanTest method testDefaultPartitionerWithParallel.

@Test
public void testDefaultPartitionerWithParallel() throws InterruptedException {
    final MutableInt loadInd = new MutableInt();
    StatsListener listener = new StatsListener() {

        @Override
        public Response processStats(BatchedOperatorStats stats) {
            Response response = new Response();
            response.repartitionRequired = true;
            response.loadIndicator = loadInd.intValue();
            return response;
        }
    };
    LogicalPlan dag = new LogicalPlan();
    GenericTestOperator nodeX = dag.addOperator("X", GenericTestOperator.class);
    dag.setOperatorAttribute(nodeX, Context.OperatorContext.PARTITIONER, new StatelessPartitioner<GenericTestOperator>(2));
    dag.setOperatorAttribute(nodeX, Context.OperatorContext.STATS_LISTENERS, Lists.newArrayList(listener));
    GenericTestOperator nodeY = dag.addOperator("Y", GenericTestOperator.class);
    dag.setOperatorAttribute(nodeY, Context.OperatorContext.PARTITIONER, new TestPartitioner<GenericTestOperator>());
    GenericTestOperator nodeZ = dag.addOperator("Z", GenericTestOperator.class);
    dag.addStream("Stream1", nodeX.outport1, nodeY.inport1, nodeZ.inport1);
    dag.addStream("Stream2", nodeX.outport2, nodeY.inport2, nodeZ.inport2);
    dag.setInputPortAttribute(nodeY.inport1, Context.PortContext.PARTITION_PARALLEL, true);
    dag.setInputPortAttribute(nodeY.inport2, Context.PortContext.PARTITION_PARALLEL, true);
    dag.setInputPortAttribute(nodeZ.inport1, Context.PortContext.PARTITION_PARALLEL, true);
    dag.setInputPortAttribute(nodeZ.inport2, Context.PortContext.PARTITION_PARALLEL, true);
    StramTestSupport.MemoryStorageAgent msa = new StramTestSupport.MemoryStorageAgent();
    dag.setAttribute(Context.OperatorContext.STORAGE_AGENT, msa);
    TestPlanContext ctx = new TestPlanContext();
    PhysicalPlan plan = new PhysicalPlan(dag, ctx);
    LogicalPlan.OperatorMeta metaOfX = dag.getMeta(nodeX);
    LogicalPlan.OperatorMeta metaOfY = dag.getMeta(nodeY);
    Assert.assertEquals("number operators " + metaOfX.getName(), 2, plan.getOperators(metaOfX).size());
    Assert.assertEquals("number operators " + metaOfY.getName(), 2, plan.getOperators(metaOfY).size());
    List<PTOperator> ptOfX = plan.getOperators(metaOfX);
    for (PTOperator physicalX : ptOfX) {
        Assert.assertEquals("2 streams " + physicalX.getOutputs(), 2, physicalX.getOutputs().size());
        for (PTOutput outputPort : physicalX.getOutputs()) {
            Set<PTOperator> dopers = Sets.newHashSet();
            Assert.assertEquals("sink of " + metaOfX.getName() + " id " + physicalX.id + " port " + outputPort.portName, 2, outputPort.sinks.size());
            for (PTInput inputPort : outputPort.sinks) {
                dopers.add(inputPort.target);
            }
            Assert.assertEquals(2, dopers.size());
        }
    }
    // Invoke redo-partition of PhysicalPlan, no partition change
    loadInd.setValue(0);
    for (PTOperator ptOperator : ptOfX) {
        plan.onStatusUpdate(ptOperator);
    }
    ctx.events.remove(0).run();
    for (PTOperator physicalX : ptOfX) {
        Assert.assertEquals("2 streams " + physicalX.getOutputs(), 2, physicalX.getOutputs().size());
        for (PTOutput outputPort : physicalX.getOutputs()) {
            Set<PTOperator> dopers = Sets.newHashSet();
            Assert.assertEquals("sink of " + metaOfX.getName() + " id " + physicalX.id + " port " + outputPort.portName, 2, outputPort.sinks.size());
            for (PTInput inputPort : outputPort.sinks) {
                dopers.add(inputPort.target);
            }
            Assert.assertEquals(2, dopers.size());
        }
    }
    // scale up by splitting first partition
    loadInd.setValue(1);
    plan.onStatusUpdate(ptOfX.get(0));
    ctx.events.get(0).run();
    List<PTOperator> ptOfXScaleUp = plan.getOperators(metaOfX);
    Assert.assertEquals("3 partitons " + ptOfXScaleUp, 3, ptOfXScaleUp.size());
    for (PTOperator physicalX : ptOfXScaleUp) {
        Assert.assertEquals("2 streams " + physicalX.getOutputs(), 2, physicalX.getOutputs().size());
        for (PTOutput outputPort : physicalX.getOutputs()) {
            Set<PTOperator> dopers = Sets.newHashSet();
            Assert.assertEquals("sink of " + metaOfX.getName() + " id " + physicalX.id + " port " + outputPort.portName, 2, outputPort.sinks.size());
            for (PTInput inputPort : outputPort.sinks) {
                dopers.add(inputPort.target);
            }
            Assert.assertEquals(2, dopers.size());
        }
    }
}

Example 2 with PTInput

use of com.datatorrent.stram.plan.physical.PTOperator.PTInput in project apex-core by apache.

the class PhysicalPlanTest method testCascadingUnifier.

@Test
public void testCascadingUnifier() {
    LogicalPlan dag = new LogicalPlan();
    PartitioningTestOperator o1 = dag.addOperator("o1", PartitioningTestOperator.class);
    o1.partitionKeys = new Integer[] { 0, 1, 2, 3 };
    o1.setPartitionCount(o1.partitionKeys.length);
    dag.setOperatorAttribute(o1, OperatorContext.STATS_LISTENERS, Arrays.asList(new StatsListener[] { new PartitioningTest.PartitionLoadWatch() }));
    dag.setOutputPortAttribute(o1.outport1, PortContext.UNIFIER_LIMIT, 2);
    OperatorMeta o1Meta = dag.getMeta(o1);
    GenericTestOperator o2 = dag.addOperator("o2", GenericTestOperator.class);
    dag.setOperatorAttribute(o2, OperatorContext.PARTITIONER, new StatelessPartitioner<GenericTestOperator>(3));
    OperatorMeta o2Meta = dag.getMeta(o2);
    dag.addStream("o1.outport1", o1.outport1, o2.inport1);
    dag.setAttribute(LogicalPlan.CONTAINERS_MAX_COUNT, 10);
    TestPlanContext ctx = new TestPlanContext();
    dag.setAttribute(OperatorContext.STORAGE_AGENT, ctx);
    PhysicalPlan plan = new PhysicalPlan(dag, ctx);
    Assert.assertEquals("number of containers", 9, plan.getContainers().size());
    List<PTOperator> o1Partitions = plan.getOperators(o1Meta);
    Assert.assertEquals("partitions " + o1Meta, 4, o1Partitions.size());
    Assert.assertEquals("partitioned map " + o1.partitions, 4, o1.partitions.size());
    List<PTOperator> o2Partitions = plan.getOperators(o2Meta);
    Assert.assertEquals("partitions " + o1Meta, 3, o2Partitions.size());
    for (PTOperator o : o1Partitions) {
        Assert.assertEquals("outputs " + o, 1, o.getOutputs().size());
        for (PTOutput out : o.getOutputs()) {
            Assert.assertEquals("sinks " + out, 1, out.sinks.size());
        }
        Assert.assertNotNull("container " + o, o.getContainer());
    }
    List<PTOperator> o1Unifiers = plan.getMergeOperators(o1Meta);
    // 2 cascadingUnifiers to per-downstream partition unifier(s)
    Assert.assertEquals("o1Unifiers " + o1Meta, 2, o1Unifiers.size());
    for (PTOperator o : o1Unifiers) {
        Assert.assertEquals("inputs " + o, 2, o.getInputs().size());
        Assert.assertEquals("outputs " + o, 1, o.getOutputs().size());
        for (PTOutput out : o.getOutputs()) {
            Assert.assertEquals("sinks " + out, 3, out.sinks.size());
            for (PTInput in : out.sinks) {
                // MxN unifier
                Assert.assertTrue(in.target.isUnifier());
                Assert.assertEquals(1, in.target.getOutputs().get(0).sinks.size());
            }
        }
        Assert.assertNotNull("container " + o, o.getContainer());
    }
    for (int i = 0; i < 4; i++) {
        PTContainer container = plan.getContainers().get(i);
        Assert.assertEquals("number operators " + container, 1, container.getOperators().size());
        Assert.assertTrue(o1Partitions.contains(container.getOperators().get(0)));
    }
    for (int i = 4; i < 6; i++) {
        PTContainer container = plan.getContainers().get(i);
        Assert.assertEquals("number operators " + container, 1, container.getOperators().size());
        Assert.assertTrue(o1Unifiers.contains(container.getOperators().get(0)));
    }
    for (int i = 6; i < 9; i++) {
        PTContainer container = plan.getContainers().get(i);
        Assert.assertEquals("number operators " + container, 2, container.getOperators().size());
        Assert.assertTrue(o2Partitions.contains(container.getOperators().get(0)));
    }
    PTOperator p1 = o1Partitions.get(0);
    StatsListener l = p1.statsListeners.get(0);
    Assert.assertTrue("stats handlers " + p1.statsListeners, l instanceof PartitioningTest.PartitionLoadWatch);
    PartitioningTest.PartitionLoadWatch.put(p1, 1);
    plan.onStatusUpdate(p1);
    Assert.assertEquals("partition scaling triggered", 1, ctx.events.size());
    o1.partitionKeys = new Integer[] { 0, 1, 2, 3, 4 };
    ctx.events.remove(0).run();
    o1Partitions = plan.getOperators(o1Meta);
    Assert.assertEquals("partitions " + o1Meta, 5, o1Partitions.size());
    Assert.assertEquals("partitioned map " + o1.partitions, 5, o1.partitions.size());
    o1Unifiers = plan.getMergeOperators(o1Meta);
    // 3(l1)x2(l2)
    Assert.assertEquals("o1Unifiers " + o1Meta, 3, o1Unifiers.size());
    for (PTOperator o : o1Unifiers) {
        Assert.assertNotNull("container null: " + o, o.getContainer());
    }
}

Example 3 with PTInput

use of com.datatorrent.stram.plan.physical.PTOperator.PTInput in project apex-core by apache.

the class PhysicalPlanTest method testRepartitioningScaleDown.

@Test
public void testRepartitioningScaleDown() {
    LogicalPlan dag = new LogicalPlan();
    GenericTestOperator o1 = dag.addOperator("o1", GenericTestOperator.class);
    GenericTestOperator o2 = dag.addOperator("o2", GenericTestOperator.class);
    GenericTestOperator o3parallel = dag.addOperator("o3parallel", GenericTestOperator.class);
    OperatorMeta o3Meta = dag.getMeta(o3parallel);
    GenericTestOperator mergeNode = dag.addOperator("mergeNode", GenericTestOperator.class);
    dag.addStream("o1.outport1", o1.outport1, o2.inport1, o2.inport2);
    dag.addStream("o2.outport1", o2.outport1, o3parallel.inport1).setLocality(Locality.CONTAINER_LOCAL);
    dag.setInputPortAttribute(o3parallel.inport1, PortContext.PARTITION_PARALLEL, true);
    dag.addStream("o3parallel_outport1", o3parallel.outport1, mergeNode.inport1);
    dag.getAttributes().put(LogicalPlan.CONTAINERS_MAX_COUNT, 2);
    OperatorMeta node2Meta = dag.getMeta(o2);
    node2Meta.getAttributes().put(OperatorContext.STATS_LISTENERS, Lists.newArrayList((StatsListener) new PartitionLoadWatch(3, 5)));
    node2Meta.getAttributes().put(OperatorContext.PARTITIONER, new StatelessPartitioner<GenericTestOperator>(8));
    TestPlanContext ctx = new TestPlanContext();
    dag.setAttribute(OperatorContext.STORAGE_AGENT, ctx);
    PhysicalPlan plan = new PhysicalPlan(dag, ctx);
    Assert.assertEquals("number of containers", 2, plan.getContainers().size());
    Assert.assertEquals("Count of storage requests", plan.getAllOperators().size(), ctx.backupRequests);
    List<PTOperator> n2Instances = plan.getOperators(node2Meta);
    Assert.assertEquals("partition instances " + n2Instances, 8, n2Instances.size());
    PTOperator po = n2Instances.get(0);
    Collection<PTOperator> unifiers = plan.getMergeOperators(node2Meta);
    Assert.assertEquals("unifiers " + node2Meta, 0, unifiers.size());
    Collection<PTOperator> o3unifiers = plan.getOperators(dag.getMeta(mergeNode)).get(0).upstreamMerge.values();
    Assert.assertEquals("unifiers " + o3Meta, 1, o3unifiers.size());
    PTOperator o3unifier = o3unifiers.iterator().next();
    Assert.assertEquals("unifier inputs " + o3unifier, 8, o3unifier.getInputs().size());
    Set<PTOperator> expUndeploy = Sets.newHashSet(plan.getOperators(dag.getMeta(mergeNode)));
    expUndeploy.addAll(n2Instances);
    expUndeploy.addAll(plan.getOperators(o3Meta));
    expUndeploy.addAll(o3unifiers);
    // verify load update generates expected events per configuration
    Assert.assertEquals("stats handlers " + po, 1, po.statsListeners.size());
    StatsListener l = po.statsListeners.get(0);
    Assert.assertTrue("stats handlers " + po.statsListeners, l instanceof PartitionLoadWatch);
    // no delay
    ((PartitionLoadWatch) l).evalIntervalMillis = -1;
    setThroughput(po, 5);
    plan.onStatusUpdate(po);
    Assert.assertEquals("load upper bound", 0, ctx.events.size());
    setThroughput(po, 3);
    plan.onStatusUpdate(po);
    Assert.assertEquals("load lower bound", 0, ctx.events.size());
    setThroughput(po, 2);
    plan.onStatusUpdate(po);
    Assert.assertEquals("load below min", 1, ctx.events.size());
    ctx.backupRequests = 0;
    ctx.events.remove(0).run();
    // expect operators unchanged
    Assert.assertEquals("partitions unchanged", Sets.newHashSet(n2Instances), Sets.newHashSet(plan.getOperators(node2Meta)));
    for (PTOperator o : n2Instances) {
        setThroughput(o, 2);
        plan.onStatusUpdate(o);
    }
    Assert.assertEquals("load below min", 1, ctx.events.size());
    ctx.events.remove(0).run();
    Assert.assertEquals("partitions merged", 4, plan.getOperators(node2Meta).size());
    Assert.assertEquals("unifier inputs after scale down " + o3unifier, 4, o3unifier.getInputs().size());
    for (PTOperator p : plan.getOperators(o3Meta)) {
        Assert.assertEquals("outputs " + p.getOutputs(), 1, p.getOutputs().size());
    }
    for (PTOperator p : plan.getOperators(node2Meta)) {
        PartitionKeys pks = p.getPartitionKeys().values().iterator().next();
        Assert.assertEquals("partition mask " + p, 3, pks.mask);
        Assert.assertEquals("inputs " + p, 2, p.getInputs().size());
        boolean portConnected = false;
        for (PTInput input : p.getInputs()) {
            if (GenericTestOperator.IPORT1.equals(input.portName)) {
                portConnected = true;
                Assert.assertEquals("partition mask " + input, pks, input.partitions);
            }
        }
        Assert.assertTrue("connected " + GenericTestOperator.IPORT1, portConnected);
    }
    Assert.assertEquals("" + ctx.undeploy, expUndeploy, ctx.undeploy);
    o3unifiers = plan.getOperators(dag.getMeta(mergeNode)).get(0).upstreamMerge.values();
    Set<PTOperator> expDeploy = Sets.newHashSet(plan.getOperators(dag.getMeta(mergeNode)));
    expDeploy.addAll(plan.getOperators(node2Meta));
    expDeploy.addAll(plan.getOperators(o3Meta));
    expDeploy.addAll(o3unifiers);
    Assert.assertEquals("" + ctx.deploy, expDeploy, ctx.deploy);
    for (PTOperator oper : ctx.deploy) {
        Assert.assertNotNull("container " + oper, oper.getContainer());
    }
    Assert.assertEquals("Count of storage requests", 8, ctx.backupRequests);
}

Example 4 with PTInput

use of com.datatorrent.stram.plan.physical.PTOperator.PTInput in project apex-core by apache.

the class PhysicalPlan method updateStreamMappings.

private void updateStreamMappings(PMapping m) {
    for (Map.Entry<OutputPortMeta, StreamMeta> opm : m.logicalOperator.getOutputStreams().entrySet()) {
        StreamMapping ug = m.outputStreams.get(opm.getKey());
        if (ug == null) {
            ug = new StreamMapping(opm.getValue(), this);
            m.outputStreams.put(opm.getKey(), ug);
        }
        LOG.debug("update stream mapping for {} {}", opm.getKey().getOperatorMeta(), opm.getKey().getPortName());
        ug.setSources(m.partitions);
    }
    for (Map.Entry<InputPortMeta, StreamMeta> ipm : m.logicalOperator.getInputStreams().entrySet()) {
        PMapping sourceMapping = this.logicalToPTOperator.get(ipm.getValue().getSource().getOperatorMeta());
        if (ipm.getValue().getSource().getOperatorMeta().getOperator() instanceof Operator.DelayOperator) {
            // skip if the source is a DelayOperator
            continue;
        }
        if (ipm.getKey().getValue(PortContext.PARTITION_PARALLEL)) {
            if (sourceMapping.partitions.size() < m.partitions.size()) {
                throw new AssertionError("Number of partitions don't match in parallel mapping " + sourceMapping.logicalOperator.getName() + " -> " + m.logicalOperator.getName() + ", " + sourceMapping.partitions.size() + " -> " + m.partitions.size());
            }
            int slidingWindowCount = 0;
            OperatorMeta sourceOM = sourceMapping.logicalOperator;
            if (sourceOM.getAttributes().contains(Context.OperatorContext.SLIDE_BY_WINDOW_COUNT)) {
                if (sourceOM.getValue(Context.OperatorContext.SLIDE_BY_WINDOW_COUNT) < sourceOM.getValue(Context.OperatorContext.APPLICATION_WINDOW_COUNT)) {
                    slidingWindowCount = sourceOM.getValue(OperatorContext.SLIDE_BY_WINDOW_COUNT);
                } else {
                    LOG.warn("Sliding Window Count {} should be less than APPLICATION WINDOW COUNT {}", sourceOM.getValue(Context.OperatorContext.SLIDE_BY_WINDOW_COUNT), sourceOM.getValue(Context.OperatorContext.APPLICATION_WINDOW_COUNT));
                }
            }
            for (int i = 0; i < m.partitions.size(); i++) {
                PTOperator oper = m.partitions.get(i);
                PTOperator sourceOper = sourceMapping.partitions.get(i);
                for (PTOutput sourceOut : sourceOper.outputs) {
                    nextSource: if (sourceOut.logicalStream == ipm.getValue()) {
                        // avoid duplicate entries in case of parallel partitions
                        for (PTInput sinkIn : sourceOut.sinks) {
                            // input-port-meta currently being looked at since we allow an output port to connect to multiple inputs of the same operator.
                            if (sinkIn.target == oper && sinkIn.portName.equals(ipm.getKey().getPortName())) {
                                break nextSource;
                            }
                        }
                        PTInput input;
                        if (slidingWindowCount > 0) {
                            PTOperator slidingUnifier = StreamMapping.createSlidingUnifier(sourceOut.logicalStream, this, sourceOM.getValue(Context.OperatorContext.APPLICATION_WINDOW_COUNT), slidingWindowCount);
                            StreamMapping.addInput(slidingUnifier, sourceOut, null);
                            input = new PTInput(ipm.getKey().getPortName(), ipm.getValue(), oper, null, slidingUnifier.outputs.get(0), ipm.getKey().getValue(LogicalPlan.IS_CONNECTED_TO_DELAY_OPERATOR));
                            sourceMapping.outputStreams.get(ipm.getValue().getSource()).slidingUnifiers.add(slidingUnifier);
                        } else {
                            input = new PTInput(ipm.getKey().getPortName(), ipm.getValue(), oper, null, sourceOut, ipm.getKey().getValue(LogicalPlan.IS_CONNECTED_TO_DELAY_OPERATOR));
                        }
                        oper.inputs.add(input);
                    }
                }
            }
        } else {
            StreamMapping ug = sourceMapping.outputStreams.get(ipm.getValue().getSource());
            if (ug == null) {
                ug = new StreamMapping(ipm.getValue(), this);
                m.outputStreams.put(ipm.getValue().getSource(), ug);
            }
            LOG.debug("update upstream stream mapping for {} {}", sourceMapping.logicalOperator, ipm.getValue().getSource().getPortName());
            ug.setSources(sourceMapping.partitions);
        }
    }
}

Example 5 with PTInput

use of com.datatorrent.stram.plan.physical.PTOperator.PTInput in project apex-core by apache.

the class StreamMapping method redoMapping.

/**
 * rebuild the tree, which may cause more changes to execution layer than need be
 * TODO: investigate incremental logic
 */
private void redoMapping() {
    Set<Pair<PTOperator, InputPortMeta>> downstreamOpers = Sets.newHashSet();
    // figure out the downstream consumers
    for (InputPortMeta ipm : streamMeta.getSinks()) {
        // skipped for parallel partitions - those are handled elsewhere
        if (!ipm.getValue(PortContext.PARTITION_PARALLEL) && plan.hasMapping(ipm.getOperatorMeta())) {
            List<PTOperator> partitions = plan.getOperators(ipm.getOperatorMeta());
            for (PTOperator doper : partitions) {
                downstreamOpers.add(new Pair<>(doper, ipm));
            }
        }
    }
    if (!downstreamOpers.isEmpty()) {
        // unifiers are required
        for (PTOperator unifier : this.cascadingUnifiers) {
            detachUnifier(unifier);
        }
        if (this.finalUnifier != null) {
            detachUnifier(finalUnifier);
        }
        List<PTOperator> currentUnifiers = Lists.newArrayList(this.cascadingUnifiers);
        this.cascadingUnifiers.clear();
        plan.undeployOpers.addAll(currentUnifiers);
        addSlidingUnifiers();
        int limit = streamMeta.getSource().getValue(PortContext.UNIFIER_LIMIT);
        boolean separateUnifiers = false;
        Integer lastId = null;
        for (InputPortMeta ipm : streamMeta.getSinks()) {
            Integer id = plan.getStreamCodecIdentifier(ipm.getStreamCodec());
            if (lastId == null) {
                lastId = id;
            } else if (!id.equals(lastId)) {
                separateUnifiers = true;
                break;
            }
        }
        List<PTOutput> unifierSources = this.upstream;
        Map<StreamCodec<?>, List<PTOutput>> cascadeUnifierSourcesMap = Maps.newHashMap();
        if (limit > 1 && this.upstream.size() > limit) {
            // cascading unifier
            if (!separateUnifiers) {
                unifierSources = setupCascadingUnifiers(this.upstream, currentUnifiers, limit, 0);
            } else {
                for (InputPortMeta ipm : streamMeta.getSinks()) {
                    StreamCodec<?> streamCodec = ipm.getStreamCodec();
                    if (!cascadeUnifierSourcesMap.containsKey(streamCodec)) {
                        unifierSources = setupCascadingUnifiers(this.upstream, currentUnifiers, limit, 0);
                        cascadeUnifierSourcesMap.put(streamCodec, unifierSources);
                    }
                }
            }
        }
        // remove remaining unifiers
        for (PTOperator oper : currentUnifiers) {
            plan.removePTOperator(oper);
        }
        // Directly getting attribute from map to know if it is set or not as it can be overriden by the input
        Boolean sourceSingleFinal = streamMeta.getSource().getAttributes().get(PortContext.UNIFIER_SINGLE_FINAL);
        // link the downstream operators with the unifiers
        for (Pair<PTOperator, InputPortMeta> doperEntry : downstreamOpers) {
            Map<LogicalPlan.InputPortMeta, PartitionKeys> partKeys = doperEntry.first.partitionKeys;
            PartitionKeys pks = partKeys != null ? partKeys.get(doperEntry.second) : null;
            Boolean sinkSingleFinal = doperEntry.second.getAttributes().get(PortContext.UNIFIER_SINGLE_FINAL);
            boolean lastSingle = (sinkSingleFinal != null) ? sinkSingleFinal : (sourceSingleFinal != null ? sourceSingleFinal.booleanValue() : PortContext.UNIFIER_SINGLE_FINAL.defaultValue);
            if (upstream.size() > 1) {
                // detach downstream from upstream operator for the case where no unifier existed previously
                for (PTOutput source : upstream) {
                    Iterator<PTInput> sinks = source.sinks.iterator();
                    while (sinks.hasNext()) {
                        PTInput sink = sinks.next();
                        if (sink.target == doperEntry.first) {
                            doperEntry.first.inputs.remove(sink);
                            sinks.remove();
                        }
                    }
                }
                if (!separateUnifiers && lastSingle) {
                    if (finalUnifier == null) {
                        finalUnifier = createUnifier(streamMeta, plan);
                    }
                    setInput(doperEntry.first, doperEntry.second, finalUnifier, (pks == null) || (pks.mask == 0) ? null : pks);
                    if (finalUnifier.inputs.isEmpty()) {
                        // set unifier inputs once, regardless how many downstream operators there are
                        for (PTOutput out : unifierSources) {
                            addInput(this.finalUnifier, out, null);
                        }
                    }
                } else {
                    // MxN partitioning: unifier per downstream partition
                    LOG.debug("MxN unifier for {} {} {}", new Object[] { doperEntry.first, doperEntry.second.getPortName(), pks });
                    PTOperator unifier = doperEntry.first.upstreamMerge.get(doperEntry.second);
                    if (unifier == null) {
                        unifier = createUnifier(streamMeta, plan);
                        doperEntry.first.upstreamMerge.put(doperEntry.second, unifier);
                        setInput(doperEntry.first, doperEntry.second, unifier, null);
                    }
                    // sources may change dynamically, rebuild inputs (as for cascading unifiers)
                    for (PTInput in : unifier.inputs) {
                        in.source.sinks.remove(in);
                    }
                    unifier.inputs.clear();
                    List<PTOutput> doperUnifierSources = unifierSources;
                    if (separateUnifiers) {
                        List<PTOutput> cascadeSources = cascadeUnifierSourcesMap.get(doperEntry.second.getStreamCodec());
                        if (cascadeSources != null) {
                            doperUnifierSources = cascadeSources;
                        }
                    }
                    // add new inputs
                    for (PTOutput out : doperUnifierSources) {
                        addInput(unifier, out, (pks == null) || (pks.mask == 0) ? null : pks);
                    }
                }
            } else {
                // no partitioning
                PTOperator unifier = doperEntry.first.upstreamMerge.remove(doperEntry.second);
                if (unifier != null) {
                    plan.removePTOperator(unifier);
                }
                setInput(doperEntry.first, doperEntry.second, upstream.get(0).source, pks);
            }
        }
        // 2) Downstream operators partitions are scaled up from one to multiple. (replaced by merged unifier)
        if (finalUnifier != null && finalUnifier.inputs.isEmpty()) {
            plan.removePTOperator(finalUnifier);
            finalUnifier = null;
        }
    }
}