Examples of org.apache.tajo.engine.planner.global.ExecutionBlockCursor

Package org.apache.tajo.engine.planner.global

Examples of org.apache.tajo.engine.planner.global.ExecutionBlockCursor

org.apache.tajo.engine.planner.global.ExecutionBlockCursor
A distributed execution plan (DEP) is a direct acyclic graph (DAG) of ExecutionBlocks. This class is a pointer to an ExecutionBlock that the query engine should execute. For each call of nextBlock(), it retrieves a next ExecutionBlock in a postfix order.

    this.queryStr = queryStr;
    subqueries = Maps.newHashMap();
    this.eventHandler = eventHandler;
    this.plan = plan;
    this.sm = context.getStorageManager();
    cursor = new ExecutionBlockCursor(plan);


    ReadWriteLock readWriteLock = new ReentrantReadWriteLock();
    this.readLock = readWriteLock.readLock();
    this.writeLock = readWriteLock.writeLock();

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    @Override
    public QueryState transition(Query query, QueryEvent event) {
      // increase the count for completed subqueries
      query.completedSubQueryCount++;
      SubQueryCompletedEvent castEvent = (SubQueryCompletedEvent) event;
      ExecutionBlockCursor cursor = query.getExecutionBlockCursor();
      MasterPlan masterPlan = query.getPlan();
      // if the subquery is succeeded
      if (castEvent.getFinalState() == SubQueryState.SUCCEEDED) {
        ExecutionBlock nextBlock = cursor.nextBlock();
        if (!query.getPlan().isTerminal(nextBlock) || !query.getPlan().isRoot(nextBlock)) {
          SubQuery nextSubQuery = new SubQuery(query.context, query.getPlan(), nextBlock, query.sm);
          nextSubQuery.setPriority(query.priority--);
          query.addSubQuery(nextSubQuery);
          nextSubQuery.handle(new SubQueryEvent(nextSubQuery.getId(),

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    optimizer.optimize(logicalPlan);
    QueryContext queryContext = new QueryContext();
    MasterPlan plan = new MasterPlan(LocalTajoTestingUtility.newQueryId(), queryContext, logicalPlan);
    planner.build(plan);


    ExecutionBlockCursor cursor = new ExecutionBlockCursor(plan);


    int count = 0;
    while(cursor.hasNext()) {
      cursor.nextBlock();
      count++;
    }


    // 4 input relations, 1 broadcast join and 2 symmetric repartition joins and 1 terminal = 8 execution blocks
    assertEquals(8, count);

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    this.queryStr = queryStr;
    subqueries = Maps.newHashMap();
    this.eventHandler = eventHandler;
    this.plan = plan;
    this.sm = context.getStorageManager();
    cursor = new ExecutionBlockCursor(plan);


    ReadWriteLock readWriteLock = new ReentrantReadWriteLock();
    this.readLock = readWriteLock.readLock();
    this.writeLock = readWriteLock.writeLock();

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  }


  public static class SubQueryCompletedTransition implements SingleArcTransition<Query, QueryEvent> {


    private boolean hasNext(Query query) {
      ExecutionBlockCursor cursor = query.getExecutionBlockCursor();
      ExecutionBlock nextBlock = cursor.peek();
      return !query.getPlan().isTerminal(nextBlock);
    }

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      ExecutionBlock nextBlock = cursor.peek();
      return !query.getPlan().isTerminal(nextBlock);
    }


    private void executeNextBlock(Query query) {
      ExecutionBlockCursor cursor = query.getExecutionBlockCursor();
      ExecutionBlock nextBlock = cursor.nextBlock();
      SubQuery nextSubQuery = new SubQuery(query.context, query.getPlan(), nextBlock, query.sm);
      nextSubQuery.setPriority(query.priority--);
      query.addSubQuery(nextSubQuery);
      nextSubQuery.handle(new SubQueryEvent(nextSubQuery.getId(), SubQueryEventType.SQ_INIT));

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    optimizer.optimize(logicalPlan);
    QueryContext queryContext = new QueryContext();
    MasterPlan plan = new MasterPlan(LocalTajoTestingUtility.newQueryId(), queryContext, logicalPlan);
    planner.build(plan);


    ExecutionBlockCursor cursor = new ExecutionBlockCursor(plan);


    int count = 0;
    while(cursor.hasNext()) {
      cursor.nextBlock();
      count++;
    }


    assertEquals(6, count);
  }

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Related Classes of org.apache.tajo.engine.planner.global.ExecutionBlockCursor

org.apache.tajo.master.querymaster.Query

org.apache.tajo.master.querymaster.Query$SubQueryCompletedTransition

org.apache.tajo.master.TestExecutionBlockCursor

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