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242 lines
7.9 KiB
C++
242 lines
7.9 KiB
C++
#pragma once
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#include <common/logger_useful.h>
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#include <Core/ColumnNumbers.h>
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#include <DataStreams/MergingSortedBlockInputStream.h>
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#include <AggregateFunctions/IAggregateFunction.h>
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#include <Columns/ColumnAggregateFunction.h>
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#include <Common/OptimizedRegularExpression.h>
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#include <Common/AlignedBuffer.h>
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namespace DB
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{
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/** Intended for implementation of "rollup" - aggregation (rounding) of older data
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* for a table with Graphite data (Graphite is the system for time series monitoring).
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*
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* Table with graphite data has at least the following columns (accurate to the name):
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* Path, Time, Value, Version
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*
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* Path - name of metric (sensor);
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* Time - time of measurement;
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* Value - value of measurement;
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* Version - a number, that for equal pairs of Path and Time, need to leave only record with maximum version.
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*
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* Each row in a table correspond to one value of one sensor.
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*
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* Pattern should contain function, retention scheme, or both of them. The order of patterns does mean as well:
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* * Aggregation OR retention patterns should be first
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* * Then aggregation AND retention full patterns have to be placed
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* * default pattern without regexp must be the last
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*
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* Rollup rules are specified in the following way:
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*
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* pattern
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* regexp
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* function
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* pattern
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* regexp
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* age -> precision
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* age -> precision
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* ...
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* pattern
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* regexp
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* function
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* age -> precision
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* age -> precision
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* ...
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* pattern
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* ...
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* default
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* function
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* age -> precision
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* ...
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*
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* regexp - pattern for sensor name
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* default - if no pattern has matched
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*
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* age - minimal data age (in seconds), to start rounding with specified precision.
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* precision - rounding precision (in seconds)
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*
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* function - name of aggregate function to be applied for values, that time was rounded to same.
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*
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* Example:
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*
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* <graphite_rollup>
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* <pattern>
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* <regexp>\.max$</regexp>
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* <function>max</function>
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* </pattern>
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* <pattern>
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* <regexp>click_cost</regexp>
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* <function>any</function>
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* <retention>
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* <age>0</age>
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* <precision>5</precision>
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* </retention>
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* <retention>
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* <age>86400</age>
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* <precision>60</precision>
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* </retention>
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* </pattern>
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* <default>
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* <function>max</function>
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* <retention>
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* <age>0</age>
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* <precision>60</precision>
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* </retention>
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* <retention>
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* <age>3600</age>
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* <precision>300</precision>
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* </retention>
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* <retention>
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* <age>86400</age>
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* <precision>3600</precision>
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* </retention>
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* </default>
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* </graphite_rollup>
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*/
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namespace Graphite
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{
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struct Retention
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{
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UInt32 age;
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UInt32 precision;
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};
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using Retentions = std::vector<Retention>;
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struct Pattern
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{
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std::shared_ptr<OptimizedRegularExpression> regexp;
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std::string regexp_str;
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AggregateFunctionPtr function;
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Retentions retentions; /// Must be ordered by 'age' descending.
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enum { TypeUndef, TypeRetention, TypeAggregation, TypeAll } type = TypeAll; /// The type of defined pattern, filled automatically
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};
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using Patterns = std::vector<Pattern>;
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using RetentionPattern = Pattern;
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using AggregationPattern = Pattern;
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struct Params
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{
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String config_name;
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String path_column_name;
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String time_column_name;
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String value_column_name;
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String version_column_name;
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Graphite::Patterns patterns;
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};
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using RollupRule = std::pair<const RetentionPattern *, const AggregationPattern *>;
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}
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/** Merges several sorted streams into one.
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*
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* For each group of consecutive identical values of the `path` column,
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* and the same `time` values, rounded to some precision
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* (where rounding accuracy depends on the template set for `path`
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* and the amount of time elapsed from `time` to the specified time),
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* keeps one line,
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* performing the rounding of time,
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* merge `value` values using the specified aggregate functions,
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* as well as keeping the maximum value of the `version` column.
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*/
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class GraphiteRollupSortedBlockInputStream : public MergingSortedBlockInputStream
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{
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public:
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GraphiteRollupSortedBlockInputStream(
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const BlockInputStreams & inputs_, const SortDescription & description_, size_t max_block_size_,
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const Graphite::Params & params_, time_t time_of_merge_);
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String getName() const override { return "GraphiteRollupSorted"; }
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~GraphiteRollupSortedBlockInputStream() override
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{
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if (aggregate_state_created)
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std::get<1>(current_rule)->function->destroy(place_for_aggregate_state.data());
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}
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protected:
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Block readImpl() override;
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private:
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Logger * log = &Logger::get("GraphiteRollupSortedBlockInputStream");
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const Graphite::Params params;
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size_t path_column_num;
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size_t time_column_num;
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size_t value_column_num;
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size_t version_column_num;
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/// All columns other than 'time', 'value', 'version'. They are unmodified during rollup.
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ColumnNumbers unmodified_column_numbers;
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time_t time_of_merge;
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/// No data has been read.
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bool is_first = true;
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/// All data has been read.
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bool finished = false;
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/* | path | time | rounded_time | version | value | unmodified |
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* -----------------------------------------------------------------------------------
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* | A | 11 | 10 | 1 | 1 | a | |
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* | A | 11 | 10 | 3 | 2 | b |> subgroup(A, 11) |
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* | A | 11 | 10 | 2 | 3 | c | |> group(A, 10)
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* ----------------------------------------------------------------------------------|>
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* | A | 12 | 10 | 0 | 4 | d | |> Outputs (A, 10, avg(2, 5), a)
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* | A | 12 | 10 | 1 | 5 | e |> subgroup(A, 12) |
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* -----------------------------------------------------------------------------------
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* | A | 21 | 20 | 1 | 6 | f |
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* | B | 11 | 10 | 1 | 7 | g |
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* ...
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*/
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/// Path name of current bucket
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StringRef current_group_path;
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/// Last row with maximum version for current primary key (time bucket).
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SharedBlockRowRef current_subgroup_newest_row;
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/// Time of last read row
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time_t current_time = 0;
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time_t current_time_rounded = 0;
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Graphite::RollupRule current_rule = {nullptr, nullptr};
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AlignedBuffer place_for_aggregate_state;
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bool aggregate_state_created = false; /// Invariant: if true then current_rule is not NULL.
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const Graphite::Pattern undef_pattern =
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{ /// temporary empty pattern for selectPatternForPath
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nullptr,
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"",
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nullptr,
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DB::Graphite::Retentions(),
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undef_pattern.TypeUndef,
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};
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Graphite::RollupRule selectPatternForPath(StringRef path) const;
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UInt32 selectPrecision(const Graphite::Retentions & retentions, time_t time) const;
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void merge(MutableColumns & merged_columns, SortingHeap<SortCursor> & queue);
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/// Insert the values into the resulting columns, which will not be changed in the future.
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template <typename TSortCursor>
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void startNextGroup(MutableColumns & merged_columns, TSortCursor & cursor, Graphite::RollupRule next_rule);
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/// Insert the calculated `time`, `value`, `version` values into the resulting columns by the last group of rows.
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void finishCurrentGroup(MutableColumns & merged_columns);
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/// Update the state of the aggregate function with the new `value`.
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void accumulateRow(SharedBlockRowRef & row);
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};
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}
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