| // Copyright 2014 Cloudera, Inc. |
| // |
| // 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 KUDU_COMMON_ITERATOR_STATS_H |
| #define KUDU_COMMON_ITERATOR_STATS_H |
| |
| #include <stdint.h> |
| #include <string> |
| |
| namespace kudu { |
| |
| struct IteratorStats { |
| IteratorStats(); |
| |
| std::string ToString() const; |
| |
| // The number of data blocks read from disk (or cache) by the iterator. |
| int64_t data_blocks_read_from_disk; |
| |
| // The number of bytes read from disk (or cache) by the iterator. |
| int64_t bytes_read_from_disk; |
| |
| // The number of cells which were read from disk -- regardless of whether |
| // they were decoded/materialized. |
| int64_t cells_read_from_disk; |
| |
| // Add statistics contained 'other' to this object (for each field |
| // in this object, increment it by the value of the equivalent field |
| // in 'other'). |
| void AddStats(const IteratorStats& other); |
| |
| // Same, except subtract. |
| void SubtractStats(const IteratorStats& other); |
| |
| private: |
| // DCHECK that all of the stats are non-negative. This is a no-op in |
| // release builds. |
| void DCheckNonNegative() const; |
| }; |
| |
| } // namespace kudu |
| |
| #endif |