@Test(timeout = 10000)
public void testBasicSpeculationPerVertexConf() throws Exception {
DAG dag = DAG.create("test");
String vNameNoSpec = "A";
String vNameSpec = "B";
Vertex vA = Vertex.create(vNameNoSpec, ProcessorDescriptor.create("Proc.class"), 5);
Vertex vB = Vertex.create(vNameSpec, ProcessorDescriptor.create("Proc.class"), 5);
vA.setConf(TezConfiguration.TEZ_AM_SPECULATION_ENABLED, "false");
dag.addVertex(vA);
dag.addVertex(vB);
// min/max src fraction is set to 1. So vertices will run sequentially
dag.addEdge(
Edge.create(
vA,
vB,
EdgeProperty.create(
DataMovementType.SCATTER_GATHER,
DataSourceType.PERSISTED,
SchedulingType.SEQUENTIAL,
OutputDescriptor.create("O"),
InputDescriptor.create("I"))));
MockTezClient tezClient = createTezSession();
DAGClient dagClient = tezClient.submitDAG(dag);
DAGImpl dagImpl = (DAGImpl) mockApp.getContext().getCurrentDAG();
TezVertexID vertexId = dagImpl.getVertex(vNameSpec).getVertexId();
TezVertexID vertexIdNoSpec = dagImpl.getVertex(vNameNoSpec).getVertexId();
// original attempt is killed and speculative one is successful
TezTaskAttemptID killedTaId =
TezTaskAttemptID.getInstance(TezTaskID.getInstance(vertexId, 0), 0);
TezTaskAttemptID noSpecTaId =
TezTaskAttemptID.getInstance(TezTaskID.getInstance(vertexIdNoSpec, 0), 0);
// cause speculation trigger for both
mockLauncher.setStatusUpdatesForTask(killedTaId, 100);
mockLauncher.setStatusUpdatesForTask(noSpecTaId, 100);
mockLauncher.startScheduling(true);
dagClient.waitForCompletion();
Assert.assertEquals(DAGStatus.State.SUCCEEDED, dagClient.getDAGStatus(null).getState());
org.apache.tez.dag.app.dag.Vertex vSpec = dagImpl.getVertex(vertexId);
org.apache.tez.dag.app.dag.Vertex vNoSpec = dagImpl.getVertex(vertexIdNoSpec);
// speculation for vA but not for vB
Assert.assertTrue(
vSpec.getAllCounters().findCounter(TaskCounter.NUM_SPECULATIONS).getValue() > 0);
Assert.assertEquals(
0, vNoSpec.getAllCounters().findCounter(TaskCounter.NUM_SPECULATIONS).getValue());
tezClient.stop();
}
public void testBasicSpeculation(boolean withProgress) throws Exception {
DAG dag = DAG.create("test");
Vertex vA = Vertex.create("A", ProcessorDescriptor.create("Proc.class"), 5);
dag.addVertex(vA);
MockTezClient tezClient = createTezSession();
DAGClient dagClient = tezClient.submitDAG(dag);
DAGImpl dagImpl = (DAGImpl) mockApp.getContext().getCurrentDAG();
TezVertexID vertexId = TezVertexID.getInstance(dagImpl.getID(), 0);
// original attempt is killed and speculative one is successful
TezTaskAttemptID killedTaId =
TezTaskAttemptID.getInstance(TezTaskID.getInstance(vertexId, 0), 0);
TezTaskAttemptID successTaId =
TezTaskAttemptID.getInstance(TezTaskID.getInstance(vertexId, 0), 1);
mockLauncher.updateProgress(withProgress);
// cause speculation trigger
mockLauncher.setStatusUpdatesForTask(killedTaId, 100);
mockLauncher.startScheduling(true);
dagClient.waitForCompletion();
Assert.assertEquals(DAGStatus.State.SUCCEEDED, dagClient.getDAGStatus(null).getState());
Task task = dagImpl.getTask(killedTaId.getTaskID());
Assert.assertEquals(2, task.getAttempts().size());
Assert.assertEquals(successTaId, task.getSuccessfulAttempt().getID());
TaskAttempt killedAttempt = task.getAttempt(killedTaId);
Joiner.on(",").join(killedAttempt.getDiagnostics()).contains("Killed as speculative attempt");
Assert.assertEquals(
TaskAttemptTerminationCause.TERMINATED_EFFECTIVE_SPECULATION,
killedAttempt.getTerminationCause());
if (withProgress) {
// without progress updates occasionally more than 1 task speculates
Assert.assertEquals(
1, task.getCounters().findCounter(TaskCounter.NUM_SPECULATIONS).getValue());
Assert.assertEquals(
1, dagImpl.getAllCounters().findCounter(TaskCounter.NUM_SPECULATIONS).getValue());
org.apache.tez.dag.app.dag.Vertex v = dagImpl.getVertex(killedTaId.getTaskID().getVertexID());
Assert.assertEquals(
1, v.getAllCounters().findCounter(TaskCounter.NUM_SPECULATIONS).getValue());
}
tezClient.stop();
}