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// 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. #pragma once #include #include #include #include #include #include "arrow/acero/util.h" #include "arrow/buffer.h" #include "arrow/util/pcg_random.h" namespace arrow { namespace acero { class PartitionSort { public: /// \brief Bucket sort rows on partition ids in O(num_rows) time. /// /// Include in the output exclusive cumulative sum of bucket sizes. /// This corresponds to ranges in the sorted array containing all row ids for /// each of the partitions. /// /// prtn_ranges must be initialized and have at least num_prtns + 1 elements /// when this method returns prtn_ranges[i] will contains the total number of /// elements in partitions 0 through i. prtn_ranges[0] will be 0. /// /// prtn_id_impl must be a function that takes in a row id (int) and returns /// a partition id (int). The returned partition id must be between 0 and /// num_prtns (exclusive). /// /// output_pos_impl is a function that takes in a row id (int) and a position (int) /// in the bucket sorted output. The function should insert the row in the /// output. /// /// For example: /// /// in_arr: [5, 7, 2, 3, 5, 4] /// num_prtns: 3 /// prtn_id_impl: [&in_arr] (int row_id) { return in_arr[row_id] / 3; } /// output_pos_impl: [&sorted_row_ids] (int row_id, int pos) { sorted_row_ids[pos] = /// row_id; } /// /// After Execution /// sorted_row_ids: [2, 0, 3, 4, 5, 1] /// prtn_ranges: [0, 1, 5, 6] template static void Eval(int64_t num_rows, int num_prtns, uint16_t* prtn_ranges, INPUT_PRTN_ID_FN prtn_id_impl, OUTPUT_POS_FN output_pos_impl) { ARROW_DCHECK(num_rows > 0 && num_rows <= (1 << 15)); ARROW_DCHECK(num_prtns >= 1 && num_prtns <= (1 << 15)); memset(prtn_ranges, 0, (num_prtns + 1) * sizeof(uint16_t)); for (int64_t i = 0; i < num_rows; ++i) { int prtn_id = static_cast(prtn_id_impl(i)); ++prtn_ranges[prtn_id + 1]; } uint16_t sum = 0; for (int i = 0; i < num_prtns; ++i) { uint16_t sum_next = sum + prtn_ranges[i + 1]; prtn_ranges[i + 1] = sum; sum = sum_next; } for (int64_t i = 0; i < num_rows; ++i) { int prtn_id = static_cast(prtn_id_impl(i)); int pos = prtn_ranges[prtn_id + 1]++; output_pos_impl(i, pos); } } }; /// \brief A control for synchronizing threads on a partitionable workload class PartitionLocks { public: PartitionLocks(); ~PartitionLocks(); /// \brief Initializes the control, must be called before use /// /// \param num_threads Maximum number of threads that will access the partitions /// \param num_prtns Number of partitions to synchronize void Init(size_t num_threads, int num_prtns); /// \brief Cleans up the control, it should not be used after this call void CleanUp(); /// \brief Acquire a partition to work on one /// /// \param thread_id The index of the thread trying to acquire the partition lock /// \param num_prtns Length of prtns_to_try, must be <= num_prtns used in Init /// \param prtns_to_try An array of partitions that still have remaining work /// \param limit_retries If false, this method will spinwait forever until success /// \param max_retries Max times to attempt checking out work before returning false /// \param[out] locked_prtn_id The id of the partition locked /// \param[out] locked_prtn_id_pos The index of the partition locked in prtns_to_try /// \return True if a partition was locked, false if max_retries was attempted /// without successfully acquiring a lock /// /// This method is thread safe bool AcquirePartitionLock(size_t thread_id, int num_prtns, const int* prtns_to_try, bool limit_retries, int max_retries, int* locked_prtn_id, int* locked_prtn_id_pos); /// \brief Release a partition so that other threads can work on it void ReleasePartitionLock(int prtn_id); // Executes (synchronously and using current thread) the same operation on a set of // multiple partitions. Tries to minimize partition locking overhead by randomizing and // adjusting order in which partitions are processed. // // PROCESS_PRTN_FN is a callback which will be executed for each partition after // acquiring the lock for that partition. It gets partition id as an argument. // IS_PRTN_EMPTY_FN is a callback which filters out (when returning true) partitions // with specific ids from processing. // template Status ForEachPartition(size_t thread_id, /*scratch space buffer with space for one element per partition; dirty in and dirty out*/ int* temp_unprocessed_prtns, IS_PRTN_EMPTY_FN is_prtn_empty_fn, PROCESS_PRTN_FN process_prtn_fn) { int num_unprocessed_partitions = 0; for (int i = 0; i < num_prtns_; ++i) { bool is_prtn_empty = is_prtn_empty_fn(i); if (!is_prtn_empty) { temp_unprocessed_prtns[num_unprocessed_partitions++] = i; } } while (num_unprocessed_partitions > 0) { int locked_prtn_id; int locked_prtn_id_pos; AcquirePartitionLock(thread_id, num_unprocessed_partitions, temp_unprocessed_prtns, /*limit_retries=*/false, /*max_retries=*/-1, &locked_prtn_id, &locked_prtn_id_pos); { class AutoReleaseLock { public: AutoReleaseLock(PartitionLocks* locks, int prtn_id) : locks(locks), prtn_id(prtn_id) {} ~AutoReleaseLock() { locks->ReleasePartitionLock(prtn_id); } PartitionLocks* locks; int prtn_id; } auto_release_lock(this, locked_prtn_id); ARROW_RETURN_NOT_OK(process_prtn_fn(locked_prtn_id)); } if (locked_prtn_id_pos < num_unprocessed_partitions - 1) { temp_unprocessed_prtns[locked_prtn_id_pos] = temp_unprocessed_prtns[num_unprocessed_partitions - 1]; } --num_unprocessed_partitions; } return Status::OK(); } private: std::atomic* lock_ptr(int prtn_id); int random_int(size_t thread_id, int num_values); struct PartitionLock { static constexpr int kCacheLineBytes = 64; std::atomic lock; uint8_t padding[kCacheLineBytes]; }; int num_prtns_; std::unique_ptr locks_; std::unique_ptr rngs_; }; } // namespace acero } // namespace arrow