/**
* Checks if the instance dependency chain created with the <code>setVertexToShareInstancesWith
* </code> method is acyclic.
*
* @return <code>true</code> if the dependency chain is acyclic, <code>false</code> otherwise
*/
public boolean isInstanceDependencyChainAcyclic() {
final AbstractJobVertex[] allVertices = this.getAllJobVertices();
final Set<AbstractJobVertex> alreadyVisited = new HashSet<AbstractJobVertex>();
for (AbstractJobVertex vertex : allVertices) {
if (alreadyVisited.contains(vertex)) {
continue;
}
AbstractJobVertex vertexToShareInstancesWith = vertex.getVertexToShareInstancesWith();
if (vertexToShareInstancesWith != null) {
final Set<AbstractJobVertex> cycleMap = new HashSet<AbstractJobVertex>();
while (vertexToShareInstancesWith != null) {
if (cycleMap.contains(vertexToShareInstancesWith)) {
return false;
} else {
alreadyVisited.add(vertexToShareInstancesWith);
cycleMap.add(vertexToShareInstancesWith);
vertexToShareInstancesWith = vertexToShareInstancesWith.getVertexToShareInstancesWith();
}
}
}
}
return true;
}
/**
* Auxiliary method for cycle detection. Performs a depth-first traversal with vertex markings to
* detect a cycle. If a node with a temporary marking is found, then there is a cycle. Once all
* children of a vertex have been traversed the parent node cannot be part of another cycle and is
* thus permanently marked.
*
* @param jv current job vertex to check
* @param temporarilyMarked set of temporarily marked nodes
* @param permanentlyMarked set of permanently marked nodes
* @return <code>true</code> if there is a cycle, <code>false</code> otherwise
*/
private boolean detectCycle(
final AbstractJobVertex jv,
final HashSet<JobVertexID> temporarilyMarked,
final HashSet<JobVertexID> permanentlyMarked) {
JobVertexID vertexID = jv.getID();
if (permanentlyMarked.contains(vertexID)) {
return false;
} else if (temporarilyMarked.contains(vertexID)) {
return true;
} else {
temporarilyMarked.add(vertexID);
for (int i = 0; i < jv.getNumberOfForwardConnections(); i++) {
if (detectCycle(
jv.getForwardConnection(i).getConnectedVertex(),
temporarilyMarked,
permanentlyMarked)) {
return true;
}
}
permanentlyMarked.add(vertexID);
return false;
}
}
@Test
public void testTopologicalSort1() {
try {
AbstractJobVertex source1 = new AbstractJobVertex("source1");
AbstractJobVertex source2 = new AbstractJobVertex("source2");
AbstractJobVertex target1 = new AbstractJobVertex("target1");
AbstractJobVertex target2 = new AbstractJobVertex("target2");
AbstractJobVertex intermediate1 = new AbstractJobVertex("intermediate1");
AbstractJobVertex intermediate2 = new AbstractJobVertex("intermediate2");
target1.connectNewDataSetAsInput(source1, DistributionPattern.POINTWISE);
target2.connectNewDataSetAsInput(source1, DistributionPattern.POINTWISE);
target2.connectNewDataSetAsInput(intermediate2, DistributionPattern.POINTWISE);
intermediate2.connectNewDataSetAsInput(intermediate1, DistributionPattern.POINTWISE);
intermediate1.connectNewDataSetAsInput(source2, DistributionPattern.POINTWISE);
JobGraph graph =
new JobGraph(
"TestGraph", source1, source2, intermediate1, intermediate2, target1, target2);
List<AbstractJobVertex> sorted = graph.getVerticesSortedTopologicallyFromSources();
assertEquals(6, sorted.size());
assertBefore(source1, target1, sorted);
assertBefore(source1, target2, sorted);
assertBefore(source2, target2, sorted);
assertBefore(source2, intermediate1, sorted);
assertBefore(source2, intermediate2, sorted);
assertBefore(intermediate1, target2, sorted);
assertBefore(intermediate2, target2, sorted);
} catch (Exception e) {
e.printStackTrace();
fail(e.getMessage());
}
}
@Test
public void testTopoSortCyclicGraphNoSources() {
try {
AbstractJobVertex v1 = new AbstractJobVertex("1");
AbstractJobVertex v2 = new AbstractJobVertex("2");
AbstractJobVertex v3 = new AbstractJobVertex("3");
AbstractJobVertex v4 = new AbstractJobVertex("4");
v1.connectNewDataSetAsInput(v4, DistributionPattern.POINTWISE);
v2.connectNewDataSetAsInput(v1, DistributionPattern.POINTWISE);
v3.connectNewDataSetAsInput(v2, DistributionPattern.POINTWISE);
v4.connectNewDataSetAsInput(v3, DistributionPattern.POINTWISE);
JobGraph jg = new JobGraph("Cyclic Graph", v1, v2, v3, v4);
try {
jg.getVerticesSortedTopologicallyFromSources();
fail("Failed to raise error on topologically sorting cyclic graph.");
} catch (InvalidProgramException e) {
// that what we wanted
}
} catch (Exception e) {
e.printStackTrace();
fail(e.getMessage());
}
}
/**
* Auxiliary method to collect all vertices which are reachable from the input vertices.
*
* @param jv the currently considered job vertex
* @param collector a temporary list to store the vertices that have already been visisted
*/
private void collectVertices(
final AbstractJobVertex jv,
final HashSet<JobVertexID> visited,
final List<AbstractJobVertex> collector) {
visited.add(jv.getID());
collector.add(jv);
for (int i = 0; i < jv.getNumberOfForwardConnections(); i++) {
AbstractJobVertex vertex = jv.getForwardConnection(i).getConnectedVertex();
if (!visited.contains(vertex.getID())) {
collectVertices(vertex, visited, collector);
}
}
}
@Test
public void testTopologicalSort3() {
// --> op1 --
// / \
// (source) - +-> op2 -> op3
// \ /
// ---------
try {
AbstractJobVertex source = new AbstractJobVertex("source");
AbstractJobVertex op1 = new AbstractJobVertex("op4");
AbstractJobVertex op2 = new AbstractJobVertex("op2");
AbstractJobVertex op3 = new AbstractJobVertex("op3");
op1.connectNewDataSetAsInput(source, DistributionPattern.POINTWISE);
op2.connectNewDataSetAsInput(op1, DistributionPattern.POINTWISE);
op2.connectNewDataSetAsInput(source, DistributionPattern.POINTWISE);
op3.connectNewDataSetAsInput(op2, DistributionPattern.POINTWISE);
JobGraph graph = new JobGraph("TestGraph", source, op1, op2, op3);
List<AbstractJobVertex> sorted = graph.getVerticesSortedTopologicallyFromSources();
assertEquals(4, sorted.size());
assertBefore(source, op1, sorted);
assertBefore(source, op2, sorted);
assertBefore(op1, op2, sorted);
assertBefore(op2, op3, sorted);
} catch (Exception e) {
e.printStackTrace();
fail(e.getMessage());
}
}
/**
* Returns an array of all job vertices than can be reached when traversing the job graph from the
* input vertices. Each job vertex is contained only one time.
*
* @return an array of all job vertices than can be reached when traversing the job graph from the
* input vertices
*/
public AbstractJobVertex[] getAllReachableJobVertices() {
if (bufferedAllReachableJobVertices == null) {
final List<AbstractJobVertex> collector = new ArrayList<AbstractJobVertex>();
final HashSet<JobVertexID> visited = new HashSet<JobVertexID>();
final Iterator<AbstractJobInputVertex> inputs = getInputVertices();
while (inputs.hasNext()) {
AbstractJobVertex vertex = inputs.next();
if (!visited.contains(vertex.getID())) {
collectVertices(vertex, visited, collector);
}
}
bufferedAllReachableJobVertices = collector.toArray(new AbstractJobVertex[0]);
}
return bufferedAllReachableJobVertices;
}
/**
* Checks for all registered job vertices if their in-/out-degree is correct.
*
* @return <code>null</code> if the in-/out-degree of all vertices is correct or the first job
* vertex whose in-/out-degree is incorrect.
*/
public AbstractJobVertex areVertexDegreesCorrect() {
// Check input vertices
final Iterator<AbstractJobInputVertex> iter = getInputVertices();
while (iter.hasNext()) {
final AbstractJobVertex jv = iter.next();
if (jv.getNumberOfForwardConnections() < 1 || jv.getNumberOfBackwardConnections() > 0) {
return jv;
}
}
// Check task vertices
final Iterator<JobTaskVertex> iter2 = getTaskVertices();
while (iter2.hasNext()) {
final AbstractJobVertex jv = iter2.next();
if (jv.getNumberOfForwardConnections() < 1 || jv.getNumberOfBackwardConnections() < 1) {
return jv;
}
}
// Check output vertices
final Iterator<AbstractJobOutputVertex> iter3 = getOutputVertices();
while (iter3.hasNext()) {
final AbstractJobVertex jv = iter3.next();
if (jv.getNumberOfForwardConnections() > 0 || jv.getNumberOfBackwardConnections() < 1) {
return jv;
}
}
return null;
}
@Test
public void testSerialization() {
try {
JobGraph jg = new JobGraph("The graph");
// add some configuration values
{
jg.getJobConfiguration().setString("some key", "some value");
jg.getJobConfiguration().setDouble("Life of ", Math.PI);
}
// add some vertices
{
AbstractJobVertex source1 = new AbstractJobVertex("source1");
AbstractJobVertex source2 = new AbstractJobVertex("source2");
AbstractJobVertex target = new AbstractJobVertex("target");
target.connectNewDataSetAsInput(source1, DistributionPattern.POINTWISE);
target.connectNewDataSetAsInput(source2, DistributionPattern.ALL_TO_ALL);
jg.addVertex(source1);
jg.addVertex(source2);
jg.addVertex(target);
}
// de-/serialize and compare
JobGraph copy = CommonTestUtils.createCopySerializable(jg);
assertEquals(jg.getName(), copy.getName());
assertEquals(jg.getJobID(), copy.getJobID());
assertEquals(jg.getJobConfiguration(), copy.getJobConfiguration());
assertEquals(jg.getNumberOfVertices(), copy.getNumberOfVertices());
for (AbstractJobVertex vertex : copy.getVertices()) {
AbstractJobVertex original = jg.findVertexByID(vertex.getID());
assertNotNull(original);
assertEquals(original.getName(), vertex.getName());
assertEquals(original.getNumberOfInputs(), vertex.getNumberOfInputs());
assertEquals(
original.getNumberOfProducedIntermediateDataSets(),
vertex.getNumberOfProducedIntermediateDataSets());
}
} catch (Exception e) {
e.printStackTrace();
fail(e.getMessage());
}
}
@Test
public void testTopologicalSort2() {
try {
AbstractJobVertex source1 = new AbstractJobVertex("source1");
AbstractJobVertex source2 = new AbstractJobVertex("source2");
AbstractJobVertex root = new AbstractJobVertex("root");
AbstractJobVertex l11 = new AbstractJobVertex("layer 1 - 1");
AbstractJobVertex l12 = new AbstractJobVertex("layer 1 - 2");
AbstractJobVertex l13 = new AbstractJobVertex("layer 1 - 3");
AbstractJobVertex l2 = new AbstractJobVertex("layer 2");
root.connectNewDataSetAsInput(l13, DistributionPattern.POINTWISE);
root.connectNewDataSetAsInput(source2, DistributionPattern.POINTWISE);
root.connectNewDataSetAsInput(l2, DistributionPattern.POINTWISE);
l2.connectNewDataSetAsInput(l11, DistributionPattern.POINTWISE);
l2.connectNewDataSetAsInput(l12, DistributionPattern.POINTWISE);
l11.connectNewDataSetAsInput(source1, DistributionPattern.POINTWISE);
l12.connectNewDataSetAsInput(source1, DistributionPattern.POINTWISE);
l12.connectNewDataSetAsInput(source2, DistributionPattern.POINTWISE);
l13.connectNewDataSetAsInput(source2, DistributionPattern.POINTWISE);
JobGraph graph = new JobGraph("TestGraph", source1, source2, root, l11, l13, l12, l2);
List<AbstractJobVertex> sorted = graph.getVerticesSortedTopologicallyFromSources();
assertEquals(7, sorted.size());
assertBefore(source1, root, sorted);
assertBefore(source2, root, sorted);
assertBefore(l11, root, sorted);
assertBefore(l12, root, sorted);
assertBefore(l13, root, sorted);
assertBefore(l2, root, sorted);
assertBefore(l11, l2, sorted);
assertBefore(l12, l2, sorted);
assertBefore(l2, root, sorted);
assertBefore(source1, l2, sorted);
assertBefore(source2, l2, sorted);
assertBefore(source2, l13, sorted);
} catch (Exception e) {
e.printStackTrace();
fail(e.getMessage());
}
}
@Override
public void read(final DataInput in) throws IOException {
// Read job id
this.jobID.read(in);
// Read the job name
this.jobName = StringRecord.readString(in);
// Read required jar files
readRequiredJarFiles(in);
// First read total number of vertices;
final int numVertices = in.readInt();
// First, recreate each vertex and add it to reconstructionMap
for (int i = 0; i < numVertices; i++) {
final String className = StringRecord.readString(in);
final JobVertexID id = new JobVertexID();
id.read(in);
final String vertexName = StringRecord.readString(in);
Class<? extends IOReadableWritable> c;
try {
c = ClassUtils.getRecordByName(className);
} catch (ClassNotFoundException cnfe) {
throw new IOException(cnfe.toString());
}
// Find constructor
Constructor<? extends IOReadableWritable> cst;
try {
cst = c.getConstructor(String.class, JobVertexID.class, JobGraph.class);
} catch (SecurityException e1) {
throw new IOException(e1.toString());
} catch (NoSuchMethodException e1) {
throw new IOException(e1.toString());
}
try {
cst.newInstance(vertexName, id, this);
} catch (IllegalArgumentException e) {
throw new IOException(e.toString());
} catch (InstantiationException e) {
throw new IOException(e.toString());
} catch (IllegalAccessException e) {
throw new IOException(e.toString());
} catch (InvocationTargetException e) {
throw new IOException(e.toString());
}
}
final JobVertexID tmpID = new JobVertexID();
for (int i = 0; i < numVertices; i++) {
AbstractJobVertex jv;
tmpID.read(in);
if (inputVertices.containsKey(tmpID)) {
jv = inputVertices.get(tmpID);
} else {
if (outputVertices.containsKey(tmpID)) {
jv = outputVertices.get(tmpID);
} else {
if (taskVertices.containsKey(tmpID)) {
jv = taskVertices.get(tmpID);
} else {
throw new IOException("Cannot find vertex with ID " + tmpID + " in any vertex map.");
}
}
}
// Read the vertex data
jv.read(in);
}
// Find the class loader for the job
final ClassLoader cl = LibraryCacheManager.getClassLoader(this.jobID);
if (cl == null) {
throw new IOException("Cannot find class loader for job graph " + this.jobID);
}
// Re-instantiate the job configuration object and read the configuration
this.jobConfiguration = new Configuration(cl);
this.jobConfiguration.read(in);
}
