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From zuyu <...@git.apache.org>
Subject [GitHub] incubator-quickstep pull request #64: Introduced Shiftboss for the distribut...
Date Wed, 27 Jul 2016 18:43:23 GMT
Github user zuyu commented on a diff in the pull request:

    https://github.com/apache/incubator-quickstep/pull/64#discussion_r72498665
  
    --- Diff: query_execution/Shiftboss.hpp ---
    @@ -0,0 +1,241 @@
    +/**
    + *   Licensed under the Apache License, Version 2.0 (the "License");
    + *   you may not use this file except in compliance with the License.
    + *   You may obtain a copy of the License at
    + *
    + *       http://www.apache.org/licenses/LICENSE-2.0
    + *
    + *   Unless required by applicable law or agreed to in writing, software
    + *   distributed under the License is distributed on an "AS IS" BASIS,
    + *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    + *   See the License for the specific language governing permissions and
    + *   limitations under the License.
    + **/
    +
    +#ifndef QUICKSTEP_QUERY_EXECUTION_SHIFTBOSS_HPP_
    +#define QUICKSTEP_QUERY_EXECUTION_SHIFTBOSS_HPP_
    +
    +#include <cstddef>
    +#include <memory>
    +#include <unordered_map>
    +
    +#include "catalog/CatalogDatabaseCache.hpp"
    +#include "catalog/CatalogTypedefs.hpp"
    +#include "query_execution/QueryContext.hpp"
    +#include "query_execution/QueryExecutionTypedefs.hpp"
    +#include "query_execution/WorkerDirectory.hpp"
    +#include "threading/Thread.hpp"
    +#include "utility/Macros.hpp"
    +
    +#include "glog/logging.h"
    +
    +#include "tmb/address.h"
    +#include "tmb/id_typedefs.h"
    +#include "tmb/message_bus.h"
    +
    +namespace quickstep {
    +
    +class StorageManager;
    +
    +namespace serialization {
    +class CatalogDatabase;
    +class QueryContext;
    +}  // namespace serialization
    +
    +/** \addtogroup QueryExecution
    + *  @{
    + */
    +
    +/**
    + * @brief The Shiftboss accepts workorder protos from shiftboss, and assigns
    + *        the workorders to workers.
    + **/
    +class Shiftboss : public Thread {
    + public:
    +  /**
    +   * @brief Constructor.
    +   *
    +   * @param bus A pointer to the TMB.
    +   * @param storage_manager The StorageManager to use.
    +   * @param workers A pointer to the WorkerDirectory.
    --- End diff --
    
    `ForemanSingleNode` does not describe which creates `WorkerDirectory`. And it is obviously
the `QuicksteCli` that does.
    
    For the distributed case, the `Worker` executable does the similar task.


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