How to use

outputDependencies

method

in

org.apache.hadoop.hive.ql.exec.ExplainTask

public JSONObject outputDependencies(PrintStream out, boolean jsonOutput,
  boolean appendTaskType, List<Task> tasks)
  throws Exception {
 if (out != null) {
  out.println(STAGE_DEPENDENCIES + ":");
 }
 JSONObject json = jsonOutput ? new JSONObject(new LinkedHashMap<>()) : null;
 for (Task task : tasks) {
  JSONObject jsonOut = outputDependencies(task, out, json, jsonOutput, appendTaskType, 2);
  if (jsonOutput && jsonOut != null) {
   json.put(task.getId(), jsonOut);
  }
 }
 return jsonOutput ? json : null;
}

public JSONObject outputDependencies(PrintStream out, boolean jsonOutput,
  boolean appendTaskType, List<Task> tasks)
  throws Exception {
 if (out != null) {
  out.println("STAGE DEPENDENCIES:");
 }
 JSONObject json = jsonOutput ? new JSONObject(new LinkedHashMap<>()) : null;
 for (Task task : tasks) {
  JSONObject jsonOut = outputDependencies(task, out, json, jsonOutput, appendTaskType, 2);
  if (jsonOutput && jsonOut != null) {
   json.put(task.getId(), jsonOut);
  }
 }
 return jsonOutput ? json : null;
}

JSONObject jsonDependencies = outputDependencies(out, jsonOutput, appendTaskType, ordered);

@Test
public void testOutputDependenciesJsonShouldMatch() throws Exception {
 Task<? extends ExplainTask> task = mockTask();
 JsonNode result = objectMapper.readTree(
     uut.outputDependencies(task, out, null, true, true, 0).toString());
 JsonNode expected = objectMapper.readTree("{\"ROOT STAGE\":\"TRUE\",\"BACKUP STAGE\":" +
     "\""+BACKUP_ID+"\",\"TASK TYPE\":\"EXPLAIN\"}");
 assertEquals(expected, result);
}

JSONObject jsonDependencies = outputDependencies(out, jsonOutput, appendTaskType, ordered);

public void outputDependencies(PrintStream out,
  List<Task<? extends Serializable>> rootTasks, int indent) throws Exception {
 out.print(indentString(indent));
 out.println("STAGE DEPENDENCIES:");
 for (Task<? extends Serializable> rootTask : rootTasks) {
  outputDependencies(rootTask, out, indent + 2, true);
 }
}

public JSONObject outputDependencies(PrintStream out, boolean jsonOutput,
  boolean appendTaskType, List<Task> tasks)
  throws Exception {
 if (out != null) {
  out.println("STAGE DEPENDENCIES:");
 }
 JSONObject json = jsonOutput ? new JSONObject() : null;
 for (Task task : tasks) {
  JSONObject jsonOut = outputDependencies(task, out, json, jsonOutput, appendTaskType, 2);
  if (jsonOutput && jsonOut != null) {
   json.put(task.getId(), jsonOut);
  }
 }
 return jsonOutput ? json : null;
}

@Override
public int execute(DriverContext driverContext) {
 try {
  Path resFile = new Path(work.getResFile());
  OutputStream outS = resFile.getFileSystem(conf).create(resFile);
  PrintStream out = new PrintStream(outS);
  // Print out the parse AST
  outputAST(work.getAstStringTree(), out, 0);
  out.println();
  outputDependencies(out, work.getRootTasks(), 0);
  out.println();
  // Go over all the tasks and dump out the plans
  outputStagePlans(out, work.getRootTasks(), 0);
  out.close();
  return (0);
 } catch (Exception e) {
  console.printError("Failed with exception " + e.getMessage(), "\n"
    + StringUtils.stringifyException(e));
  return (1);
 }
}

for (Task<? extends Serializable> con : ((ConditionalTask) task)
  .getListTasks()) {
 outputDependencies(con, out, indent, false);
 outputDependencies(child, out, indent, true);

JSONObject jsonDependencies = outputDependencies(out, jsonOutput, appendTaskType, ordered);