Examples with OperatorMeta com.datatorrent.stram.plan.logical.LogicalPlan.OperatorMeta used on opensource projects

Example 51 with OperatorMeta

use of com.datatorrent.stram.plan.logical.LogicalPlan.OperatorMeta in project apex-core by apache.

the class PhysicalPlanTest method testAugmentedDynamicPartitioning.

/**
   * Test covering scenario when only new partitions are added during dynamic partitioning and there
   * are no changes to existing partitions and partition mapping
   */
@Test
public void testAugmentedDynamicPartitioning() {
    LogicalPlan dag = new LogicalPlan();
    TestGeneratorInputOperator o1 = dag.addOperator("o1", TestGeneratorInputOperator.class);
    dag.setOperatorAttribute(o1, OperatorContext.PARTITIONER, new TestAugmentingPartitioner<TestGeneratorInputOperator>(3));
    dag.setOperatorAttribute(o1, OperatorContext.STATS_LISTENERS, Lists.newArrayList((StatsListener) new PartitioningTest.PartitionLoadWatch()));
    OperatorMeta o1Meta = dag.getMeta(o1);
    GenericTestOperator o2 = dag.addOperator("o2", GenericTestOperator.class);
    OperatorMeta o2Meta = dag.getMeta(o2);
    dag.addStream("o1.outport1", o1.outport, o2.inport1);
    int maxContainers = 10;
    dag.setAttribute(LogicalPlan.CONTAINERS_MAX_COUNT, maxContainers);
    TestPlanContext ctx = new TestPlanContext();
    dag.setAttribute(OperatorContext.STORAGE_AGENT, ctx);
    PhysicalPlan plan = new PhysicalPlan(dag, ctx);
    Assert.assertEquals("number of containers", 4, plan.getContainers().size());
    List<PTOperator> o1ops = plan.getOperators(o1Meta);
    Assert.assertEquals("number of o1 operators", 3, o1ops.size());
    List<PTOperator> o2ops = plan.getOperators(o2Meta);
    Assert.assertEquals("number of o2 operators", 1, o2ops.size());
    Set<PTOperator> expUndeploy = Sets.newLinkedHashSet();
    expUndeploy.addAll(plan.getOperators(o2Meta));
    expUndeploy.add(plan.getOperators(o2Meta).get(0).upstreamMerge.values().iterator().next());
    for (int i = 0; i < 2; ++i) {
        PartitioningTest.PartitionLoadWatch.put(o1ops.get(i), 1);
        plan.onStatusUpdate(o1ops.get(i));
    }
    ctx.backupRequests = 0;
    ctx.events.remove(0).run();
    Assert.assertEquals("number of containers", 6, plan.getContainers().size());
    Assert.assertEquals("undeployed opertors", expUndeploy, ctx.undeploy);
}

Example 52 with OperatorMeta

use of com.datatorrent.stram.plan.logical.LogicalPlan.OperatorMeta in project apex-core by apache.

the class PhysicalPlanTest method testDefaultPartitioning.

@Test
public void testDefaultPartitioning() {
    LogicalPlan dag = new LogicalPlan();
    dag.setAttribute(OperatorContext.STORAGE_AGENT, new StramTestSupport.MemoryStorageAgent());
    GenericTestOperator node1 = dag.addOperator("node1", GenericTestOperator.class);
    GenericTestOperator node2 = dag.addOperator("node2", GenericTestOperator.class);
    dag.addStream("node1.outport1", node1.outport1, node2.inport2, node2.inport1);
    int initialPartitionCount = 5;
    OperatorMeta node2Decl = dag.getMeta(node2);
    node2Decl.getAttributes().put(OperatorContext.PARTITIONER, new StatelessPartitioner<GenericTestOperator>(initialPartitionCount));
    PhysicalPlan plan = new PhysicalPlan(dag, new TestPlanContext());
    List<PTOperator> n2Instances = plan.getOperators(node2Decl);
    Assert.assertEquals("partition instances " + n2Instances, initialPartitionCount, n2Instances.size());
    List<Integer> assignedPartitionKeys = Lists.newArrayList();
    for (int i = 0; i < n2Instances.size(); i++) {
        PTOperator n2Partition = n2Instances.get(i);
        Assert.assertNotNull("partition keys null: " + n2Partition, n2Partition.getPartitionKeys());
        Map<InputPort<?>, PartitionKeys> pkeys = n2Partition.getPartitionKeys();
        // one port partitioned
        Assert.assertEquals("partition keys size: " + pkeys, 1, pkeys.size());
        InputPort<?> expectedPort = node2.inport2;
        Assert.assertEquals("partition port: " + pkeys, expectedPort, pkeys.keySet().iterator().next());
        Assert.assertEquals("partition mask: " + pkeys, "111", Integer.toBinaryString(pkeys.get(expectedPort).mask));
        Set<Integer> pks = pkeys.get(expectedPort).partitions;
        Assert.assertTrue("number partition keys: " + pkeys, pks.size() == 1 || pks.size() == 2);
        assignedPartitionKeys.addAll(pks);
    }
    int expectedMask = Integer.parseInt("111", 2);
    Assert.assertEquals("assigned partitions ", expectedMask + 1, assignedPartitionKeys.size());
    for (int i = 0; i <= expectedMask; i++) {
        Assert.assertTrue("" + assignedPartitionKeys, assignedPartitionKeys.contains(i));
    }
}

Example 53 with OperatorMeta

use of com.datatorrent.stram.plan.logical.LogicalPlan.OperatorMeta in project apex-core by apache.

the class PhysicalPlanTest method testSingleFinalMxNPartitioning.

/**
   * MxN partitioning. When source and sink of a stream are partitioned, a
   * separate unifier is created container local with each downstream partition.
   */
@Test
public void testSingleFinalMxNPartitioning() {
    LogicalPlan dag = new LogicalPlan();
    TestGeneratorInputOperator o1 = dag.addOperator("o1", TestGeneratorInputOperator.class);
    dag.setOperatorAttribute(o1, OperatorContext.PARTITIONER, new StatelessPartitioner<TestGeneratorInputOperator>(2));
    dag.setOperatorAttribute(o1, OperatorContext.STATS_LISTENERS, Lists.newArrayList((StatsListener) new PartitioningTest.PartitionLoadWatch()));
    dag.setOutputPortAttribute(o1.outport, PortContext.UNIFIER_SINGLE_FINAL, true);
    OperatorMeta o1Meta = dag.getMeta(o1);
    GenericTestOperator o2 = dag.addOperator("o2", GenericTestOperator.class);
    dag.setOperatorAttribute(o2, OperatorContext.PARTITIONER, new StatelessPartitioner<TestGeneratorInputOperator>(3));
    dag.setOperatorAttribute(o2, OperatorContext.STATS_LISTENERS, Arrays.asList(new StatsListener[] { new PartitioningTest.PartitionLoadWatch() }));
    OperatorMeta o2Meta = dag.getMeta(o2);
    dag.addStream("o1.outport1", o1.outport, o2.inport1);
    int maxContainers = 10;
    dag.setAttribute(LogicalPlan.CONTAINERS_MAX_COUNT, maxContainers);
    TestPlanContext ctx = new TestPlanContext();
    dag.setAttribute(OperatorContext.STORAGE_AGENT, ctx);
    PhysicalPlan plan = new PhysicalPlan(dag, ctx);
    Assert.assertEquals("number of containers", 6, plan.getContainers().size());
    List<PTOperator> inputOperators = new ArrayList<>();
    for (int i = 0; i < 2; i++) {
        PTContainer container = plan.getContainers().get(i);
        Assert.assertEquals("number operators " + container, 1, container.getOperators().size());
        Assert.assertEquals("operators " + container, o1Meta.getName(), container.getOperators().get(0).getOperatorMeta().getName());
        inputOperators.add(container.getOperators().get(0));
    }
    PTOperator inputUnifier = null;
    {
        PTContainer container = plan.getContainers().get(2);
        Assert.assertEquals("number operators " + container, 1, container.getOperators().size());
        PTOperator pUnifier = container.getOperators().get(0);
        Assert.assertEquals("operators " + container, o1Meta.getMeta(o1.outport).getUnifierMeta().getName(), pUnifier.getOperatorMeta().getName());
        Assert.assertTrue("single unifier " + pUnifier, pUnifier.isUnifier());
        Assert.assertEquals("" + pUnifier, 2, pUnifier.getInputs().size());
        for (int inputIndex = 0; inputIndex < pUnifier.getInputs().size(); inputIndex++) {
            PTInput input = pUnifier.getInputs().get(inputIndex);
            Assert.assertEquals("source port name " + pUnifier, "outport", input.source.portName);
            Assert.assertEquals("" + pUnifier, inputOperators.get(inputIndex), input.source.source);
            Assert.assertEquals("partition keys " + input.partitions, null, input.partitions);
        }
        Assert.assertEquals("number outputs " + pUnifier, 1, pUnifier.getOutputs().size());
        PTOutput output = pUnifier.getOutputs().get(0);
        Assert.assertEquals("number inputs " + output, 3, output.sinks.size());
        for (int inputIndex = 0; inputIndex < output.sinks.size(); ++inputIndex) {
            Assert.assertEquals("output sink " + output, o2Meta.getName(), output.sinks.get(inputIndex).target.getName());
            Assert.assertEquals("destination port name " + output, GenericTestOperator.IPORT1, output.sinks.get(inputIndex).portName);
        }
        inputUnifier = pUnifier;
    }
    List<Integer> partitionKeySizes = new ArrayList<>();
    for (int i = 3; i < 6; i++) {
        PTContainer container = plan.getContainers().get(i);
        Assert.assertEquals("number operators " + container, 1, container.getOperators().size());
        Assert.assertEquals("operators " + container, o2Meta.getName(), container.getOperators().get(0).getOperatorMeta().getName());
        PTOperator operator = container.getOperators().get(0);
        Assert.assertEquals("operators " + container, o2Meta.getName(), operator.getOperatorMeta().getName());
        Assert.assertEquals("number inputs " + operator, 1, operator.getInputs().size());
        PTInput input = operator.getInputs().get(0);
        Assert.assertEquals("" + operator, inputUnifier, input.source.source);
        Assert.assertNotNull("input partitions " + operator, input.partitions);
        partitionKeySizes.add(input.partitions.partitions.size());
    }
    Assert.assertEquals("input partition sizes count", 3, partitionKeySizes.size());
    Collections.sort(partitionKeySizes);
    Assert.assertEquals("input partition sizes", Arrays.asList(1, 1, 2), partitionKeySizes);
    // scale down N from 3 to 2 and then from 2 to 1
    for (int i = 0; i < 2; i++) {
        List<PTOperator> ptos = plan.getOperators(o2Meta);
        Set<PTOperator> expUndeploy = Sets.newHashSet(ptos);
        for (PTOperator ptOperator : ptos) {
            //expUndeploy.addAll(ptOperator.upstreamMerge.values());
            expUndeploy.add(ptOperator);
            PartitioningTest.PartitionLoadWatch.put(ptOperator, -1);
            plan.onStatusUpdate(ptOperator);
        }
        ctx.backupRequests = 0;
        ctx.events.remove(0).run();
        Assert.assertEquals("single unifier ", 1, plan.getMergeOperators(o1Meta).size());
        Set<PTOperator> expDeploy = Sets.newHashSet(plan.getOperators(o2Meta));
        // The unifier and o2 operators are expected to be deployed because of partition key changes
        for (PTOperator ptOperator : plan.getOperators(o2Meta)) {
            expDeploy.add(ptOperator);
        }
        // from 3 to 2 the containers decrease from 5 to 4, but from 2 to 1 the container remains same because single unifier are not inline with single operator partition
        Assert.assertEquals("number of containers", 5 - i, plan.getContainers().size());
        Assert.assertEquals("number of operators", 2 - i, plan.getOperators(o2Meta).size());
        Assert.assertEquals("undeployed operators " + ctx.undeploy, expUndeploy, ctx.undeploy);
        Assert.assertEquals("deployed operators " + ctx.deploy, expDeploy, ctx.deploy);
    }
    // scale up N from 1 to 2 and then from 2 to 3
    for (int i = 0; i < 2; i++) {
        List<PTOperator> unChangedOps = new LinkedList<>(plan.getOperators(o2Meta));
        PTOperator o2p1 = unChangedOps.remove(0);
        Set<PTOperator> expUndeploy = Sets.newHashSet(o2p1);
        PartitioningTest.PartitionLoadWatch.put(o2p1, 1);
        plan.onStatusUpdate(o2p1);
        Assert.assertEquals("repartition event", 1, ctx.events.size());
        ctx.backupRequests = 0;
        ctx.events.remove(0).run();
        Assert.assertEquals("single unifier ", 1, plan.getMergeOperators(o1Meta).size());
        Assert.assertEquals("N partitions after scale up " + o2Meta, 2 + i, plan.getOperators(o2Meta).size());
        for (PTOperator o : plan.getOperators(o2Meta)) {
            Assert.assertNotNull(o.container);
            Assert.assertEquals("number operators ", 1, o.container.getOperators().size());
        }
        Set<PTOperator> expDeploy = Sets.newHashSet(plan.getOperators(o2Meta));
        expDeploy.removeAll(unChangedOps);
        Assert.assertEquals("number of containers", 5 + i, plan.getContainers().size());
        Assert.assertEquals("undeployed operators" + ctx.undeploy, expUndeploy, ctx.undeploy);
        Assert.assertEquals("deployed operators" + ctx.deploy, expDeploy, ctx.deploy);
    }
    // scale down M to 1
    {
        Set<PTOperator> expUndeploy = Sets.newHashSet();
        Set<PTOperator> expDeploy = Sets.newHashSet();
        expUndeploy.addAll(plan.getMergeOperators(o1Meta));
        for (PTOperator o2p : plan.getOperators(o2Meta)) {
            expUndeploy.add(o2p);
            expDeploy.add(o2p);
        }
        for (PTOperator o1p : plan.getOperators(o1Meta)) {
            expUndeploy.add(o1p);
            PartitioningTest.PartitionLoadWatch.put(o1p, -1);
            plan.onStatusUpdate(o1p);
        }
        Assert.assertEquals("repartition event", 1, ctx.events.size());
        ctx.events.remove(0).run();
        Assert.assertEquals("M partitions after scale down " + o1Meta, 1, plan.getOperators(o1Meta).size());
        expUndeploy.removeAll(plan.getOperators(o1Meta));
        Assert.assertEquals("undeploy", expUndeploy, ctx.undeploy);
        Assert.assertEquals("deploy", expDeploy, ctx.deploy);
    }
    // scale up M to 2
    Assert.assertEquals("M partitions " + o1Meta, 1, plan.getOperators(o1Meta).size());
    {
        Set<PTOperator> expUndeploy = Sets.newHashSet();
        Set<PTOperator> expDeploy = Sets.newHashSet();
        for (PTOperator o1p : plan.getOperators(o1Meta)) {
            expUndeploy.add(o1p);
            PartitioningTest.PartitionLoadWatch.put(o1p, 1);
            plan.onStatusUpdate(o1p);
        }
        Assert.assertEquals("repartition event", 1, ctx.events.size());
        ctx.events.remove(0).run();
        Assert.assertEquals("M partitions after scale up " + o1Meta, 2, plan.getOperators(o1Meta).size());
        expDeploy.addAll(plan.getOperators(o1Meta));
        expDeploy.addAll(plan.getMergeOperators(o1Meta));
        for (PTOperator o2p : plan.getOperators(o2Meta)) {
            expUndeploy.add(o2p);
            expDeploy.add(o2p);
            Assert.assertNotNull(o2p.container);
            Assert.assertEquals("number operators ", 1, o2p.container.getOperators().size());
        }
        Assert.assertEquals("undeploy", expUndeploy, ctx.undeploy);
        Assert.assertEquals("deploy", expDeploy, ctx.deploy);
    }
}

Example 54 with OperatorMeta

use of com.datatorrent.stram.plan.logical.LogicalPlan.OperatorMeta in project apex-core by apache.

the class PhysicalPlanTest method testInline.

@Test
@SuppressWarnings("unchecked")
public void testInline() {
    LogicalPlan dag = new LogicalPlan();
    GenericTestOperator o1 = dag.addOperator("o1", GenericTestOperator.class);
    GenericTestOperator o2 = dag.addOperator("o2", GenericTestOperator.class);
    GenericTestOperator o3 = dag.addOperator("o3", GenericTestOperator.class);
    PartitioningTestOperator partOperator = dag.addOperator("partNode", PartitioningTestOperator.class);
    partOperator.partitionKeys = new Integer[] { 0, 1 };
    dag.getMeta(partOperator).getAttributes().put(OperatorContext.PARTITIONER, new StatelessPartitioner<GenericTestOperator>(partOperator.partitionKeys.length));
    dag.addStream("o1_outport1", o1.outport1, o2.inport1, o3.inport1, partOperator.inport1).setLocality(null);
    // same container for o2 and o3
    dag.addStream("o2_outport1", o2.outport1, o3.inport2).setLocality(Locality.CONTAINER_LOCAL);
    dag.addStream("o3_outport1", o3.outport1, partOperator.inport2);
    int maxContainers = 4;
    dag.setAttribute(LogicalPlan.CONTAINERS_MAX_COUNT, maxContainers);
    dag.setAttribute(OperatorContext.STORAGE_AGENT, new TestPlanContext());
    PhysicalPlan plan = new PhysicalPlan(dag, new TestPlanContext());
    Assert.assertEquals("number of containers", maxContainers, plan.getContainers().size());
    Assert.assertEquals("operators container 0", 1, plan.getContainers().get(0).getOperators().size());
    Assert.assertEquals("operators container 0", 1, plan.getContainers().get(0).getOperators().size());
    Set<OperatorMeta> c2ExpNodes = Sets.newHashSet(dag.getMeta(o2), dag.getMeta(o3));
    Set<OperatorMeta> c2ActNodes = new HashSet<>();
    PTContainer c2 = plan.getContainers().get(1);
    for (PTOperator pNode : c2.getOperators()) {
        c2ActNodes.add(pNode.getOperatorMeta());
    }
    Assert.assertEquals("operators " + c2, c2ExpNodes, c2ActNodes);
    // one container per partition
    OperatorMeta partOperMeta = dag.getMeta(partOperator);
    List<PTOperator> partitions = plan.getOperators(partOperMeta);
    for (PTOperator partition : partitions) {
        Assert.assertEquals("operators container" + partition, 1, partition.getContainer().getOperators().size());
    }
}

Example 55 with OperatorMeta

use of com.datatorrent.stram.plan.logical.LogicalPlan.OperatorMeta in project apex-core by apache.

the class PhysicalPlanTest method testMxNPartitioning.

/**
   * MxN partitioning. When source and sink of a stream are partitioned, a
   * separate unifier is created container local with each downstream partition.
   */
@Test
public void testMxNPartitioning() {
    LogicalPlan dag = new LogicalPlan();
    TestGeneratorInputOperator o1 = dag.addOperator("o1", TestGeneratorInputOperator.class);
    TestPartitioner<TestGeneratorInputOperator> o1Partitioner = new TestPartitioner<>();
    o1Partitioner.setPartitionCount(2);
    dag.setOperatorAttribute(o1, OperatorContext.PARTITIONER, o1Partitioner);
    dag.setOperatorAttribute(o1, OperatorContext.STATS_LISTENERS, Lists.newArrayList((StatsListener) new PartitioningTest.PartitionLoadWatch()));
    OperatorMeta o1Meta = dag.getMeta(o1);
    GenericTestOperator o2 = dag.addOperator("o2", GenericTestOperator.class);
    dag.setOperatorAttribute(o2, OperatorContext.PARTITIONER, new StatelessPartitioner<TestGeneratorInputOperator>(3));
    dag.setOperatorAttribute(o2, OperatorContext.STATS_LISTENERS, Arrays.asList(new StatsListener[] { new PartitioningTest.PartitionLoadWatch() }));
    OperatorMeta o2Meta = dag.getMeta(o2);
    dag.addStream("o1.outport1", o1.outport, o2.inport1);
    TestPlanContext ctx = new TestPlanContext();
    dag.setAttribute(OperatorContext.STORAGE_AGENT, ctx);
    PhysicalPlan plan = new PhysicalPlan(dag, ctx);
    Assert.assertEquals("number of containers", 5, plan.getContainers().size());
    List<PTOperator> inputOperators = new ArrayList<>();
    for (int i = 0; i < 2; i++) {
        PTContainer container = plan.getContainers().get(i);
        Assert.assertEquals("number operators " + container, 1, container.getOperators().size());
        Assert.assertEquals("operators " + container, o1Meta.getName(), container.getOperators().get(0).getOperatorMeta().getName());
        inputOperators.add(container.getOperators().get(0));
    }
    for (int i = 2; i < 5; i++) {
        PTContainer container = plan.getContainers().get(i);
        Assert.assertEquals("number operators " + container, 2, container.getOperators().size());
        Assert.assertEquals("operators " + container, o2Meta.getName(), container.getOperators().get(0).getOperatorMeta().getName());
        Set<String> expectedLogicalNames = Sets.newHashSet(o1Meta.getMeta(o1.outport).getUnifierMeta().getName(), o2Meta.getName());
        Map<String, PTOperator> actualOperators = new HashMap<>();
        for (PTOperator p : container.getOperators()) {
            actualOperators.put(p.getOperatorMeta().getName(), p);
        }
        Assert.assertEquals("", expectedLogicalNames, actualOperators.keySet());
        PTOperator pUnifier = actualOperators.get(o1Meta.getMeta(o1.outport).getUnifierMeta().getName());
        Assert.assertNotNull("" + pUnifier, pUnifier.getContainer());
        Assert.assertTrue("" + pUnifier, pUnifier.isUnifier());
        // input from each upstream partition
        Assert.assertEquals("" + pUnifier, 2, pUnifier.getInputs().size());
        int numberPartitionKeys = (i == 2) ? 2 : 1;
        for (int inputIndex = 0; inputIndex < pUnifier.getInputs().size(); inputIndex++) {
            PTInput input = pUnifier.getInputs().get(inputIndex);
            Assert.assertEquals("" + pUnifier, "outport", input.source.portName);
            Assert.assertEquals("" + pUnifier, inputOperators.get(inputIndex), input.source.source);
            Assert.assertEquals("partition keys " + input.partitions, numberPartitionKeys, input.partitions.partitions.size());
        }
        // output to single downstream partition
        Assert.assertEquals("" + pUnifier, 1, pUnifier.getOutputs().size());
        Assert.assertTrue("" + actualOperators.get(o2Meta.getName()).getOperatorMeta().getOperator(), actualOperators.get(o2Meta.getName()).getOperatorMeta().getOperator() instanceof GenericTestOperator);
        PTOperator p = actualOperators.get(o2Meta.getName());
        Assert.assertEquals("partition inputs " + p.getInputs(), 1, p.getInputs().size());
        Assert.assertEquals("partition inputs " + p.getInputs(), pUnifier, p.getInputs().get(0).source.source);
        Assert.assertEquals("input partition keys " + p.getInputs(), null, p.getInputs().get(0).partitions);
        Assert.assertTrue("partitioned unifier container local " + p.getInputs().get(0).source, p.getInputs().get(0).source.isDownStreamInline());
    }
    // scale down N from 3 to 2 and then from 2 to 1
    for (int i = 0; i < 2; i++) {
        List<PTOperator> ptos = plan.getOperators(o2Meta);
        Set<PTOperator> expUndeploy = Sets.newHashSet(ptos);
        for (PTOperator ptOperator : ptos) {
            expUndeploy.addAll(ptOperator.upstreamMerge.values());
            PartitioningTest.PartitionLoadWatch.put(ptOperator, -1);
            plan.onStatusUpdate(ptOperator);
        }
        ctx.backupRequests = 0;
        ctx.events.remove(0).run();
        Set<PTOperator> expDeploy = Sets.newHashSet(plan.getOperators(o2Meta));
        // Either unifiers for each partition or single unifier for single partition is expected to be deployed
        expDeploy.addAll(plan.getMergeOperators(o1Meta));
        for (PTOperator ptOperator : plan.getOperators(o2Meta)) {
            expDeploy.addAll(ptOperator.upstreamMerge.values());
        }
        Assert.assertEquals("number of containers", 4 - i, plan.getContainers().size());
        Assert.assertEquals("number of operators", 2 - i, plan.getOperators(o2Meta).size());
        Assert.assertEquals("undeployed operators " + ctx.undeploy, expUndeploy, ctx.undeploy);
        Assert.assertEquals("deployed operators " + ctx.deploy, expDeploy, ctx.deploy);
    }
    // scale up N from 1 to 2 and then from 2 to 3
    for (int i = 0; i < 2; i++) {
        List<PTOperator> unChangedOps = new LinkedList<>(plan.getOperators(o2Meta));
        PTOperator o2p1 = unChangedOps.remove(0);
        Set<PTOperator> expUndeploy = Sets.newHashSet(o2p1);
        // Either single unifier for one partition or merged unifiers for each partition is expected to be undeployed
        expUndeploy.addAll(plan.getMergeOperators(o1Meta));
        expUndeploy.addAll(o2p1.upstreamMerge.values());
        List<PTOperator> nOps = new LinkedList<>();
        for (Iterator<PTOperator> iterator = unChangedOps.iterator(); iterator.hasNext(); ) {
            PTOperator ptOperator = iterator.next();
            nOps.addAll(ptOperator.upstreamMerge.values());
        }
        unChangedOps.addAll(nOps);
        PartitioningTest.PartitionLoadWatch.put(o2p1, 1);
        plan.onStatusUpdate(o2p1);
        Assert.assertEquals("repartition event", 1, ctx.events.size());
        ctx.backupRequests = 0;
        ctx.events.remove(0).run();
        Assert.assertEquals("N partitions after scale up " + o2Meta, 2 + i, plan.getOperators(o2Meta).size());
        Assert.assertTrue("no unifiers", plan.getMergeOperators(o1Meta).isEmpty());
        for (PTOperator o : plan.getOperators(o2Meta)) {
            Assert.assertNotNull(o.container);
            PTOperator unifier = o.upstreamMerge.values().iterator().next();
            Assert.assertNotNull(unifier.container);
            Assert.assertSame("unifier in same container", o.container, unifier.container);
            Assert.assertEquals("container operators " + o.container, Sets.newHashSet(o.container.getOperators()), Sets.newHashSet(o, unifier));
        }
        Set<PTOperator> expDeploy = Sets.newHashSet(plan.getOperators(o2Meta));
        for (PTOperator ptOperator : plan.getOperators(o2Meta)) {
            expDeploy.addAll(ptOperator.upstreamMerge.values());
        }
        expDeploy.removeAll(unChangedOps);
        Assert.assertEquals("number of containers", 4 + i, plan.getContainers().size());
        Assert.assertEquals("undeployed operators" + ctx.undeploy, expUndeploy, ctx.undeploy);
        Assert.assertEquals("deployed operators" + ctx.deploy, expDeploy, ctx.deploy);
    }
    // scale down M to 1
    {
        Set<PTOperator> expUndeploy = Sets.newHashSet();
        Set<PTOperator> expDeploy = Sets.newHashSet();
        for (PTOperator o2p : plan.getOperators(o2Meta)) {
            expUndeploy.addAll(o2p.upstreamMerge.values());
            expUndeploy.add(o2p);
            expDeploy.add(o2p);
        }
        for (PTOperator o1p : plan.getOperators(o1Meta)) {
            expUndeploy.add(o1p);
            PartitioningTest.PartitionLoadWatch.put(o1p, -1);
            plan.onStatusUpdate(o1p);
        }
        Assert.assertEquals("repartition event", 1, ctx.events.size());
        ctx.events.remove(0).run();
        Assert.assertEquals("M partitions after scale down " + o1Meta, 1, plan.getOperators(o1Meta).size());
        expUndeploy.removeAll(plan.getOperators(o1Meta));
        for (PTOperator o2p : plan.getOperators(o2Meta)) {
            Assert.assertTrue("merge unifier " + o2p + " " + o2p.upstreamMerge, o2p.upstreamMerge.isEmpty());
        }
        Assert.assertEquals("undeploy", expUndeploy, ctx.undeploy);
        Assert.assertEquals("deploy", expDeploy, ctx.deploy);
    }
    // scale up M to 2
    Assert.assertEquals("M partitions " + o1Meta, 1, plan.getOperators(o1Meta).size());
    {
        Set<PTOperator> expUndeploy = Sets.newHashSet();
        Set<PTOperator> expDeploy = Sets.newHashSet();
        for (PTOperator o1p : plan.getOperators(o1Meta)) {
            PartitioningTest.PartitionLoadWatch.put(o1p, 1);
            plan.onStatusUpdate(o1p);
        }
        Assert.assertEquals("repartition event", 1, ctx.events.size());
        o1Partitioner.extraPartitions.add(new DefaultPartition<>(o1));
        ctx.events.remove(0).run();
        o1Partitioner.extraPartitions.clear();
        List<PTOperator> o1Partitions = plan.getOperators(o1Meta);
        List<PTOperator> o2Partitions = plan.getOperators(o2Meta);
        Assert.assertEquals("M partitions after scale up " + o1Meta, 2, o1Partitions.size());
        // previous partition unchanged
        expDeploy.add(o1Partitions.get(1));
        for (PTOperator o1p : o1Partitions) {
            Assert.assertEquals("outputs " + o1p, 1, o1p.getOutputs().size());
            Assert.assertEquals("sinks " + o1p, o2Partitions.size(), o1p.getOutputs().get(0).sinks.size());
        }
        for (PTOperator o2p : plan.getOperators(o2Meta)) {
            expUndeploy.add(o2p);
            expDeploy.add(o2p);
            Assert.assertEquals("merge unifier " + o2p + " " + o2p.upstreamMerge, 1, o2p.upstreamMerge.size());
            expDeploy.addAll(o2p.upstreamMerge.values());
        }
        Assert.assertEquals("undeploy", expUndeploy, ctx.undeploy);
        Assert.assertEquals("deploy", expDeploy, ctx.deploy);
    }
}