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From jianq...@apache.org
Subject [06/46] incubator-quickstep git commit: Created a class to track execution statistics
Date Mon, 26 Feb 2018 19:15:47 GMT
Created a class to track execution statistics

- Stats are maintained for active operators in the query.


Project: http://git-wip-us.apache.org/repos/asf/incubator-quickstep/repo
Commit: http://git-wip-us.apache.org/repos/asf/incubator-quickstep/commit/1b2698d2
Tree: http://git-wip-us.apache.org/repos/asf/incubator-quickstep/tree/1b2698d2
Diff: http://git-wip-us.apache.org/repos/asf/incubator-quickstep/diff/1b2698d2

Branch: refs/heads/fix-iwyu
Commit: 1b2698d2225bfab59fb675da5f92a2285dd5650c
Parents: 9cbb930
Author: Harshad Deshmukh <hbdeshmukh@apache.org>
Authored: Wed Sep 27 14:55:16 2017 -0500
Committer: Harshad Deshmukh <hbdeshmukh@apache.org>
Committed: Fri Sep 29 12:10:52 2017 -0500

----------------------------------------------------------------------
 query_execution/CMakeLists.txt     |   5 +
 query_execution/ExecutionStats.hpp | 211 ++++++++++++++++++++++++++++++++
 2 files changed, 216 insertions(+)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/incubator-quickstep/blob/1b2698d2/query_execution/CMakeLists.txt
----------------------------------------------------------------------
diff --git a/query_execution/CMakeLists.txt b/query_execution/CMakeLists.txt
index 9394c00..8f797f7 100644
--- a/query_execution/CMakeLists.txt
+++ b/query_execution/CMakeLists.txt
@@ -29,6 +29,7 @@ if (ENABLE_DISTRIBUTED)
   add_library(quickstep_queryexecution_BlockLocator BlockLocator.cpp BlockLocator.hpp)
   add_library(quickstep_queryexecution_BlockLocatorUtil BlockLocatorUtil.cpp BlockLocatorUtil.hpp)
 endif(ENABLE_DISTRIBUTED)
+add_library(quickstep_queryexecution_ExecutionStats ../empty_src.cpp ExecutionStats.hpp)
 add_library(quickstep_queryexecution_ForemanBase ../empty_src.cpp ForemanBase.hpp)
 if (ENABLE_DISTRIBUTED)
   add_library(quickstep_queryexecution_ForemanDistributed ForemanDistributed.cpp ForemanDistributed.hpp)
@@ -123,6 +124,9 @@ if (ENABLE_DISTRIBUTED)
                         tmb
                         ${GFLAGS_LIB_NAME})
 endif(ENABLE_DISTRIBUTED)
+target_link_libraries(quickstep_queryexecution_ExecutionStats
+                      glog
+                      quickstep_utility_Macros)
 target_link_libraries(quickstep_queryexecution_ForemanSingleNode
                       glog
                       quickstep_queryexecution_AdmitRequestMessage
@@ -363,6 +367,7 @@ target_link_libraries(quickstep_queryexecution_WorkerSelectionPolicy
 add_library(quickstep_queryexecution ../empty_src.cpp QueryExecutionModule.hpp)
 target_link_libraries(quickstep_queryexecution
                       quickstep_queryexecution_AdmitRequestMessage
+                      quickstep_queryexecution_ExecutionStats
                       quickstep_queryexecution_ForemanBase
                       quickstep_queryexecution_ForemanSingleNode
                       quickstep_queryexecution_PolicyEnforcerBase

http://git-wip-us.apache.org/repos/asf/incubator-quickstep/blob/1b2698d2/query_execution/ExecutionStats.hpp
----------------------------------------------------------------------
diff --git a/query_execution/ExecutionStats.hpp b/query_execution/ExecutionStats.hpp
new file mode 100644
index 0000000..8d19651
--- /dev/null
+++ b/query_execution/ExecutionStats.hpp
@@ -0,0 +1,211 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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_EXECUTION_STATS_HPP_
+#define QUICKSTEP_QUERY_EXECUTION_EXECUTION_STATS_HPP_
+
+#include <algorithm>
+#include <cstddef>
+#include <cstdint>
+#include <deque>
+#include <memory>
+#include <unordered_map>
+#include <utility>
+
+#include "utility/Macros.hpp"
+
+#include "glog/logging.h"
+
+namespace quickstep {
+
+/** \addtogroup QueryExecution
+ *  @{
+ */
+
+/**
+ * @brief Record the execution stats of a query.
+ *
+ * @note The time is measured in microseconds.
+ **/
+class ExecutionStats {
+ public:
+  /**
+   * @brief Constructor
+   *
+   * @param max_entries The maximum number of entries we remember for each
+   *        operator.
+   **/
+  explicit ExecutionStats(const std::size_t max_entries)
+      : max_entries_(max_entries) {}
+
+  /**
+   * @brief Get the number of active operators in stats.
+   **/
+  std::size_t getNumActiveOperators() const {
+    return active_operators_.size();
+  }
+
+  /**
+   * @brief Check if there are stats present for at least one active operator.
+   **/
+  inline bool hasStats() const {
+    for (auto it = active_operators_.begin(); it != active_operators_.end(); ++it) {
+      if (it->second->hasStatsForOperator()) {
+        return true;
+      }
+    }
+    return false;
+  }
+
+  /**
+   * @brief Get the current stats for the query.
+   *
+   * @return A pair - 1st element is total time, 2nd element is total number of
+   *         WorkOrders for the whole query.
+   **/
+  std::pair<std::uint64_t, std::uint64_t> getCurrentStatsForQuery() const {
+    std::uint64_t total_time = 0;
+    std::uint64_t num_workorders = 0;
+    for (auto it = active_operators_.begin(); it != active_operators_.end(); ++it) {
+      auto operator_stats = getCurrentStatsForOperator(it->first);
+      total_time += operator_stats.first;
+      num_workorders += operator_stats.second;
+    }
+    return std::make_pair(total_time, num_workorders);
+  }
+
+  /**
+   * @brief Get the average work order time for the query.
+   */
+  double getAverageWorkOrderTimeForQuery() const {
+    auto result = getCurrentStatsForQuery();
+    if (result.second != 0) {
+      return result.first / static_cast<double>(result.second);
+    }
+    return 0.0;
+  }
+
+  /**
+   * @brief Get the current stats for the given operator.
+   * @param operator_id The ID of the operator.
+   * @return A pair - 1st element is total time, 2nd element is total number of
+   *         WorkOrders for the operator.
+   */
+  std::pair<std::uint64_t, std::uint64_t> getCurrentStatsForOperator(const std::size_t
operator_id) const {
+    if (hasOperator(operator_id)) {
+      DCHECK(active_operators_.at(operator_id) != nullptr);
+      return active_operators_.at(operator_id)->getStats();
+    }
+    return std::make_pair(0, 0);
+  }
+
+  double getAverageWorkOrderTimeForOperator(const std::size_t operator_id) const {
+    auto result = getCurrentStatsForOperator(operator_id);
+    if (result.second != 0) {
+      return result.first / static_cast<double>(result.second);
+    }
+    return 0.0;
+  }
+
+  /**
+   * @brief Add a new entry to stats.
+   *
+   * @param value The value to be added.
+   * @param operator_index The operator index which the value belongs to.
+   **/
+  void addEntry(const std::size_t value, const std::size_t operator_index) {
+    if (!hasOperator(operator_index)) {
+      // This is the first entry for the given operator.
+      // Create the OperatorStats object for this operator.
+      active_operators_[operator_index] =
+          std::make_unique<OperatorStats>(max_entries_);
+    }
+    active_operators_[operator_index]->addEntry(value);
+  }
+
+  /**
+   * @brief Remove the operator with given index. This should be called only
+   *        when the given operator finishes its execution.
+   **/
+  void removeOperator(const std::size_t operator_index) {
+    DCHECK(hasOperator(operator_index));
+    active_operators_.erase(operator_index);
+  }
+
+ private:
+  /**
+   * @brief Stats for an operator within the query.
+   *
+   * @note We remember only the last N entries for the operator.
+   **/
+  class OperatorStats {
+   public:
+    /**
+     * @brief Constructor.
+     *
+     * @param max_entries The maximum number of entries we remember. Typically
+     *        these are the last N (=max_entries) entries.
+     **/
+    explicit OperatorStats(const std::size_t max_entries) : max_entries_(max_entries) {}
+
+    inline std::pair<std::uint64_t, std::size_t> getStats() const {
+      return std::make_pair(std::accumulate(times_.begin(), times_.end(), 0),
+                            times_.size());
+    }
+
+    inline void addEntry(const std::uint64_t time_value) {
+      if (times_.size() == max_entries_) {
+        times_.pop_front();
+      }
+      times_.push_back(time_value);
+      DCHECK_LE(times_.size(), max_entries_);
+    }
+
+    inline bool hasStatsForOperator() const {
+      return !times_.empty();
+    }
+
+   private:
+    const std::size_t max_entries_;
+    // Times are measured in microseconds.
+    std::deque<std::uint64_t> times_;
+
+    DISALLOW_COPY_AND_ASSIGN(OperatorStats);
+  };
+
+  /**
+   * @brief Check if the operator with given index is present in the stats.
+   **/
+  inline bool hasOperator(const std::size_t operator_index) const {
+    return active_operators_.find(operator_index) != active_operators_.end();
+  }
+
+  const std::size_t max_entries_;
+
+  std::unordered_map<std::size_t, std::unique_ptr<OperatorStats>>
+      active_operators_;
+
+  DISALLOW_COPY_AND_ASSIGN(ExecutionStats);
+};
+
+/** @} */
+
+}  // namespace quickstep
+
+#endif  // QUICKSTEP_QUERY_EXECUTION_EXECUTION_STATS_HPP_


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