Examples with Dispatcher org.apache.hadoop.hive.ql.lib.Dispatcher used on opensource projects

Example 46 with Dispatcher

use of org.apache.hadoop.hive.ql.lib.Dispatcher in project hive by apache.

the class IndexWhereTaskDispatcher method dispatch.

@Override
public Object dispatch(Node nd, Stack<Node> stack, Object... nodeOutputs) throws SemanticException {
    Task<? extends Serializable> task = (Task<? extends Serializable>) nd;
    ParseContext pctx = physicalContext.getParseContext();
    // create the regex's so the walker can recognize our WHERE queries
    Map<Rule, NodeProcessor> operatorRules = createOperatorRules(pctx);
    // check for no indexes on any table
    if (operatorRules == null) {
        return null;
    }
    // create context so the walker can carry the current task with it.
    IndexWhereProcCtx indexWhereOptimizeCtx = new IndexWhereProcCtx(task, pctx);
    // create the dispatcher, which fires the processor according to the rule that
    // best matches
    Dispatcher dispatcher = new DefaultRuleDispatcher(getDefaultProcessor(), operatorRules, indexWhereOptimizeCtx);
    // walk the mapper operator(not task) tree for each specific task
    GraphWalker ogw = new DefaultGraphWalker(dispatcher);
    ArrayList<Node> topNodes = new ArrayList<Node>();
    if (task.getWork() instanceof MapredWork) {
        topNodes.addAll(((MapredWork) task.getWork()).getMapWork().getAliasToWork().values());
    } else {
        return null;
    }
    ogw.startWalking(topNodes, null);
    return null;
}

Example 47 with Dispatcher

use of org.apache.hadoop.hive.ql.lib.Dispatcher in project hive by apache.

the class AnnotateWithStatistics method transform.

@Override
public ParseContext transform(ParseContext pctx) throws SemanticException {
    AnnotateStatsProcCtx aspCtx = new AnnotateStatsProcCtx(pctx);
    // create a walker which walks the tree in a BFS manner while maintaining the
    // operator stack. The dispatcher generates the plan from the operator tree
    Map<Rule, NodeProcessor> opRules = new LinkedHashMap<Rule, NodeProcessor>();
    opRules.put(new RuleRegExp("TS", TableScanOperator.getOperatorName() + "%"), StatsRulesProcFactory.getTableScanRule());
    opRules.put(new RuleRegExp("SEL", SelectOperator.getOperatorName() + "%"), StatsRulesProcFactory.getSelectRule());
    opRules.put(new RuleRegExp("FIL", FilterOperator.getOperatorName() + "%"), StatsRulesProcFactory.getFilterRule());
    opRules.put(new RuleRegExp("GBY", GroupByOperator.getOperatorName() + "%"), StatsRulesProcFactory.getGroupByRule());
    opRules.put(new RuleRegExp("JOIN", CommonJoinOperator.getOperatorName() + "%|" + MapJoinOperator.getOperatorName() + "%"), StatsRulesProcFactory.getJoinRule());
    opRules.put(new RuleRegExp("LIM", LimitOperator.getOperatorName() + "%"), StatsRulesProcFactory.getLimitRule());
    opRules.put(new RuleRegExp("RS", ReduceSinkOperator.getOperatorName() + "%"), StatsRulesProcFactory.getReduceSinkRule());
    // The dispatcher fires the processor corresponding to the closest matching
    // rule and passes the context along
    Dispatcher disp = new DefaultRuleDispatcher(StatsRulesProcFactory.getDefaultRule(), opRules, aspCtx);
    GraphWalker ogw = new LevelOrderWalker(disp, 0);
    // Create a list of topop nodes
    ArrayList<Node> topNodes = new ArrayList<Node>();
    topNodes.addAll(pctx.getTopOps().values());
    ogw.startWalking(topNodes, null);
    return pctx;
}

Example 48 with Dispatcher

use of org.apache.hadoop.hive.ql.lib.Dispatcher in project hive by apache.

the class AccumuloPredicateHandler method generateRanges.

/**
   * Encapsulates the traversal over some {@link ExprNodeDesc} tree for the generation of Accumuluo
   * Ranges using expressions involving the Accumulo rowid-mapped Hive column
   *
   * @param columnMapper
   *          Mapping of Hive to Accumulo columns for the query
   * @param hiveRowIdColumnName
   *          Name of the hive column mapped to the Accumulo rowid
   * @param root
   *          Root of some ExprNodeDesc tree to traverse, the WHERE clause
   * @return An object representing the result from the ExprNodeDesc tree traversal using the
   *         AccumuloRangeGenerator
   */
protected Object generateRanges(ColumnMapper columnMapper, String hiveRowIdColumnName, ExprNodeDesc root) {
    AccumuloRangeGenerator rangeGenerator = new AccumuloRangeGenerator(handler, columnMapper.getRowIdMapping(), hiveRowIdColumnName);
    Dispatcher disp = new DefaultRuleDispatcher(rangeGenerator, Collections.<Rule, NodeProcessor>emptyMap(), null);
    GraphWalker ogw = new DefaultGraphWalker(disp);
    ArrayList<Node> roots = new ArrayList<Node>();
    roots.add(root);
    HashMap<Node, Object> nodeOutput = new HashMap<Node, Object>();
    try {
        ogw.startWalking(roots, nodeOutput);
    } catch (SemanticException ex) {
        throw new RuntimeException(ex);
    }
    return nodeOutput.get(root);
}

Example 49 with Dispatcher

use of org.apache.hadoop.hive.ql.lib.Dispatcher in project hive by apache.

the class IndexWhereResolver method resolve.

@Override
public PhysicalContext resolve(PhysicalContext physicalContext) throws SemanticException {
    Dispatcher dispatcher = new IndexWhereTaskDispatcher(physicalContext);
    GraphWalker opGraphWalker = new DefaultGraphWalker(dispatcher);
    ArrayList<Node> topNodes = new ArrayList<Node>();
    topNodes.addAll(physicalContext.getRootTasks());
    opGraphWalker.startWalking(topNodes, null);
    return physicalContext;
}

Example 50 with Dispatcher

use of org.apache.hadoop.hive.ql.lib.Dispatcher in project hive by apache.

the class LlapDecider method resolve.

@Override
public PhysicalContext resolve(PhysicalContext pctx) throws SemanticException {
    this.conf = pctx.getConf();
    this.mode = LlapMode.valueOf(HiveConf.getVar(conf, HiveConf.ConfVars.LLAP_EXECUTION_MODE));
    Preconditions.checkState(this.mode != null, "Unrecognized LLAP mode configuration: " + HiveConf.getVar(conf, HiveConf.ConfVars.LLAP_EXECUTION_MODE));
    LOG.info("llap mode: " + this.mode);
    if (mode == none) {
        LOG.info("LLAP disabled.");
        return pctx;
    }
    // create dispatcher and graph walker
    Dispatcher disp = new LlapDecisionDispatcher(pctx, mode);
    TaskGraphWalker ogw = new TaskGraphWalker(disp);
    // get all the tasks nodes from root task
    ArrayList<Node> topNodes = new ArrayList<Node>();
    topNodes.addAll(pctx.getRootTasks());
    // begin to walk through the task tree.
    ogw.startWalking(topNodes, null);
    return pctx;
}