Example usage for org.apache.hadoop.io DoubleWritable DoubleWritable

Introduction

In this page you can find the example usage for org.apache.hadoop.io DoubleWritable DoubleWritable.

Prototype

public DoubleWritable(double value) 

Source Link

Usage

From source file:org.apache.giraph.examples.SimplePageRankComputation.java

License:Apache License

@Override
public void compute(Vertex<LongWritable, DoubleWritable, FloatWritable> vertex,
        Iterable<DoubleWritable> messages) throws IOException {
    if (getSuperstep() >= 1) {
        double sum = 0;
        for (DoubleWritable message : messages) {
            sum += message.get();/*  ww w. j  a v a  2s.  c o m*/
        }
        DoubleWritable vertexValue = new DoubleWritable((0.15f / getTotalNumVertices()) + 0.85f * sum);
        vertex.setValue(vertexValue);
        aggregate(MAX_AGG, vertexValue);
        aggregate(MIN_AGG, vertexValue);
        aggregate(SUM_AGG, new LongWritable(1));
        LOG.info(vertex.getId() + ": PageRank=" + vertexValue + " max=" + getAggregatedValue(MAX_AGG) + " min="
                + getAggregatedValue(MIN_AGG));
    }

    if (getSuperstep() < MAX_SUPERSTEPS) {
        long edges = vertex.getNumEdges();
        sendMessageToAllEdges(vertex, new DoubleWritable(vertex.getValue().get() / edges));
    } else {
        vertex.voteToHalt();
    }
}

---

From source file:org.apache.giraph.examples.SimplePageRankComputation2.java

License:Apache License

@Override
public void compute(Vertex<LongWritable, DoubleWritable, DoubleWritable> vertex,
        Iterable<DoubleWritable> messages) throws IOException {
    if (getSuperstep() >= 1) {
        double sum = 0;
        for (DoubleWritable message : messages) {
            sum += message.get();/*from w  ww .ja  v  a2 s . c om*/
        }
        DoubleWritable vertexValue = new DoubleWritable((0.15f / getTotalNumVertices()) + 0.85f * sum);
        vertex.setValue(vertexValue);
        aggregate(MAX_AGG, vertexValue);
        aggregate(MIN_AGG, vertexValue);
        aggregate(SUM_AGG, new LongWritable(1));
        LOG.info(vertex.getId() + ": PageRank=" + vertexValue + " max=" + getAggregatedValue(MAX_AGG) + " min="
                + getAggregatedValue(MIN_AGG));
    }

    if (getSuperstep() < MAX_SUPERSTEPS) {
        long edges = vertex.getNumEdges();
        sendMessageToAllEdges(vertex, new DoubleWritable(vertex.getValue().get() / edges));
    } else {
        vertex.voteToHalt();
    }
}

---

From source file:org.apache.giraph.examples.SimplePageRankVertex.java

License:Apache License

@Override
public void compute(Iterable<DoubleWritable> messages) {
    if (getSuperstep() >= 1) {
        double sum = 0;
        for (DoubleWritable message : messages) {
            sum += message.get();//from  w w  w  .j av a 2 s  .c o  m
        }
        DoubleWritable vertexValue = new DoubleWritable((0.15f / getTotalNumVertices()) + 0.85f * sum);
        setValue(vertexValue);
        aggregate(MAX_AGG, vertexValue);
        aggregate(MIN_AGG, vertexValue);
        aggregate(SUM_AGG, new LongWritable(1));
        LOG.info(getId() + ": PageRank=" + vertexValue + " max=" + getAggregatedValue(MAX_AGG) + " min="
                + getAggregatedValue(MIN_AGG));
    }

    if (getSuperstep() < MAX_SUPERSTEPS) {
        long edges = getNumEdges();
        sendMessageToAllEdges(new DoubleWritable(getValue().get() / edges));
    } else {
        voteToHalt();
    }
}

---

From source file:org.apache.giraph.examples.SimpleShortestPathsComputationTest.java

License:Apache License

/**
 * Test the behavior when a shorter path to a vertex has been found
 *//*from   w  w  w . j  av a  2s .  co m*/
@Test
public void testOnShorterPathFound() throws Exception {
    Vertex<LongWritable, DoubleWritable, FloatWritable> vertex = new DefaultVertex<LongWritable, DoubleWritable, FloatWritable>();
    SimpleShortestPathsComputation computation = new SimpleShortestPathsComputation();
    MockUtils.MockedEnvironment<LongWritable, DoubleWritable, FloatWritable, DoubleWritable> env = MockUtils
            .prepareVertexAndComputation(vertex, new LongWritable(7L), new DoubleWritable(Double.MAX_VALUE),
                    false, computation, 1L);
    Mockito.when(SOURCE_ID.get(env.getConfiguration())).thenReturn(2L);

    vertex.addEdge(EdgeFactory.create(new LongWritable(10L), new FloatWritable(2.5f)));
    vertex.addEdge(EdgeFactory.create(new LongWritable(20L), new FloatWritable(0.5f)));

    computation.compute(vertex, Lists.newArrayList(new DoubleWritable(2), new DoubleWritable(1.5)));

    assertTrue(vertex.isHalted());
    assertEquals(1.5d, vertex.getValue().get(), 0d);

    env.verifyMessageSent(new LongWritable(10L), new DoubleWritable(4));
    env.verifyMessageSent(new LongWritable(20L), new DoubleWritable(2));
}

---

From source file:org.apache.giraph.examples.SimpleShortestPathsComputationTest.java

License:Apache License

/**
 * Test the behavior when a new, but not shorter path to a vertex has been
 * found.//w  w w. j  av  a 2 s  . c  o m
 */
@Test
public void testOnNoShorterPathFound() throws Exception {
    Vertex<LongWritable, DoubleWritable, FloatWritable> vertex = new DefaultVertex<LongWritable, DoubleWritable, FloatWritable>();
    SimpleShortestPathsComputation computation = new SimpleShortestPathsComputation();
    MockUtils.MockedEnvironment<LongWritable, DoubleWritable, FloatWritable, DoubleWritable> env = MockUtils
            .prepareVertexAndComputation(vertex, new LongWritable(7L), new DoubleWritable(0.5), false,
                    computation, 1L);
    Mockito.when(SOURCE_ID.get(env.getConfiguration())).thenReturn(2L);

    vertex.addEdge(EdgeFactory.create(new LongWritable(10L), new FloatWritable(2.5f)));
    vertex.addEdge(EdgeFactory.create(new LongWritable(20L), new FloatWritable(0.5f)));

    computation.compute(vertex, Lists.newArrayList(new DoubleWritable(2), new DoubleWritable(1.5)));

    assertTrue(vertex.isHalted());
    assertEquals(0.5d, vertex.getValue().get(), 0d);

    env.verifyNoMessageSent();
}

---

From source file:org.apache.giraph.examples.SimpleShortestPathsTextComputation.java

License:Apache License

@Override
public void compute(Vertex<Text, DoubleWritable, FloatWritable> vertex, Iterable<DoubleWritable> messages)
        throws IOException {
    if (getSuperstep() == 0) {
        vertex.setValue(new DoubleWritable(Double.MAX_VALUE));
    }//ww w  .  j a v a2s  .  c o m
    double minDist = isSource(vertex) ? 0d : Double.MAX_VALUE;
    for (DoubleWritable message : messages) {
        minDist = Math.min(minDist, message.get());
    }
    if (LOG.isDebugEnabled()) {
        LOG.debug("Vertex " + vertex.getId() + " got minDist = " + minDist + " vertex value = "
                + vertex.getValue());
    }
    if (minDist < vertex.getValue().get()) {
        vertex.setValue(new DoubleWritable(minDist));
        for (Edge<Text, FloatWritable> edge : vertex.getEdges()) {
            double distance = minDist + edge.getValue().get();
            if (LOG.isDebugEnabled()) {
                LOG.debug(
                        "Vertex " + vertex.getId() + " sent to " + edge.getTargetVertexId() + " = " + distance);
            }
            sendMessage(edge.getTargetVertexId(), new DoubleWritable(distance));
        }
    }
    vertex.voteToHalt();
}

---

From source file:org.apache.giraph.examples.SimpleShortestPathsVertex.java

License:Apache License

@Override
public void compute(Iterable<DoubleWritable> messages) {
    if (getSuperstep() == 0) {
        setValue(new DoubleWritable(Double.MAX_VALUE));
    }/*  ww w  .  j av  a  2  s .co m*/
    double minDist = isSource() ? 0d : Double.MAX_VALUE;
    for (DoubleWritable message : messages) {
        minDist = Math.min(minDist, message.get());
    }
    if (LOG.isDebugEnabled()) {
        LOG.debug("Vertex " + getId() + " got minDist = " + minDist + " vertex value = " + getValue());
    }
    if (minDist < getValue().get()) {
        setValue(new DoubleWritable(minDist));
        for (Edge<LongWritable, FloatWritable> edge : getEdges()) {
            double distance = minDist + edge.getValue().get();
            if (LOG.isDebugEnabled()) {
                LOG.debug("Vertex " + getId() + " sent to " + edge.getTargetVertexId() + " = " + distance);
            }
            sendMessage(edge.getTargetVertexId(), new DoubleWritable(distance));
        }
    }
    voteToHalt();
}

---

From source file:org.apache.giraph.examples.SimpleShortestPathsVertexTest.java

License:Apache License

/**
 * Test the behavior when a shorter path to a vertex has been found
 *///from   ww w.  ja  va 2 s .com
@Test
public void testOnShorterPathFound() throws Exception {
    SimpleShortestPathsVertex vertex = new SimpleShortestPathsVertex();

    MockUtils.MockedEnvironment<LongWritable, DoubleWritable, FloatWritable, DoubleWritable> env = MockUtils
            .prepareVertex(vertex, 1L, new LongWritable(7L), new DoubleWritable(Double.MAX_VALUE), false);

    Mockito.when(SOURCE_ID.get(env.getConfiguration())).thenReturn(2L);

    vertex.addEdge(EdgeFactory.create(new LongWritable(10L), new FloatWritable(2.5f)));
    vertex.addEdge(EdgeFactory.create(new LongWritable(20L), new FloatWritable(0.5f)));

    vertex.compute(Lists.newArrayList(new DoubleWritable(2), new DoubleWritable(1.5)));

    assertTrue(vertex.isHalted());
    assertEquals(1.5d, vertex.getValue().get(), 0d);

    env.verifyMessageSent(new LongWritable(10L), new DoubleWritable(4));
    env.verifyMessageSent(new LongWritable(20L), new DoubleWritable(2));
}

---

From source file:org.apache.giraph.examples.SimpleShortestPathsVertexTest.java

License:Apache License

/**
 * Test the behavior when a new, but not shorter path to a vertex has been
 * found.//from   ww w  .  j a v  a  2s  .  c  om
 */
@Test
public void testOnNoShorterPathFound() throws Exception {

    SimpleShortestPathsVertex vertex = new SimpleShortestPathsVertex();

    MockUtils.MockedEnvironment<LongWritable, DoubleWritable, FloatWritable, DoubleWritable> env = MockUtils
            .prepareVertex(vertex, 1L, new LongWritable(7L), new DoubleWritable(0.5), false);

    Mockito.when(SOURCE_ID.get(env.getConfiguration())).thenReturn(2L);

    vertex.addEdge(EdgeFactory.create(new LongWritable(10L), new FloatWritable(2.5f)));
    vertex.addEdge(EdgeFactory.create(new LongWritable(20L), new FloatWritable(0.5f)));

    vertex.compute(Lists.newArrayList(new DoubleWritable(2), new DoubleWritable(1.5)));

    assertTrue(vertex.isHalted());
    assertEquals(0.5d, vertex.getValue().get(), 0d);

    env.verifyNoMessageSent();
}

---

From source file:org.apache.giraph.examples.SimpleShortestPathVertexTest.java

License:Apache License

/** test the behavior when a shorter path to a vertex has been found */
public void testOnShorterPathFound() throws Exception {

    SimpleShortestPathsVertex vertex = new SimpleShortestPathsVertex();
    vertex.addEdge(new LongWritable(10L), new FloatWritable(2.5f));
    vertex.addEdge(new LongWritable(20L), new FloatWritable(0.5f));

    MockUtils.MockedEnvironment<LongWritable, DoubleWritable, FloatWritable, DoubleWritable> env = MockUtils
            .prepareVertex(vertex, 1L, new LongWritable(7L), new DoubleWritable(Double.MAX_VALUE), false);

    Mockito.when(env.getConfiguration().getLong(SimpleShortestPathsVertex.SOURCE_ID,
            SimpleShortestPathsVertex.SOURCE_ID_DEFAULT)).thenReturn(2L);

    vertex.compute(Lists.newArrayList(new DoubleWritable(2), new DoubleWritable(1.5)).iterator());

    assertTrue(vertex.isHalted());// w w  w .  ja  v a 2  s  . c  om
    assertEquals(1.5, vertex.getVertexValue().get());

    env.verifyMessageSent(new LongWritable(10L), new DoubleWritable(4));
    env.verifyMessageSent(new LongWritable(20L), new DoubleWritable(2));
}

---

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