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From zuyu <...@git.apache.org>
Subject [GitHub] incubator-quickstep pull request #179: QUICKSTEP-70-71 Improve aggregation p...
Date Tue, 07 Feb 2017 19:33:14 GMT
Github user zuyu commented on a diff in the pull request:

    https://github.com/apache/incubator-quickstep/pull/179#discussion_r99908259
  
    --- Diff: storage/AggregationOperationState.hpp ---
    @@ -156,6 +152,29 @@ class AggregationOperationState {
           const CatalogDatabaseLite &database);
     
       /**
    +   * @brief Get the number of partitions to be used for initializing the
    +   *        aggregation.
    +   *
    +   * @return The number of partitions to be used for initializing the aggregation.
    +   **/
    +  std::size_t getNumInitializationPartitions() const;
    +
    +  /**
    +   * @brief Get the number of partitions to be used for finalizing the
    +   *        aggregation.
    +   *
    +   * @return The number of partitions to be used for finalizing the aggregation.
    +   **/
    +  std::size_t getNumFinalizationPartitions() const;
    --- End diff --
    
    I get your point, but for the distributed version, my concern is that we have to schedule
the finalize work order with a partition to the same node that executes the initialize work
order. Thus, your approach makes it harder to implement in the distributed version.
    
    On the other hand, we could measure the overheads of the initialize work order, and I
guess it is related small, compared to the whole aggregation processing time.


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