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default max_burst
equals to max_speed
as in Throttler
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parent
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commit
311db94640
@ -38,8 +38,8 @@ inflight_requests: ᴺᵁᴸᴸ
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inflight_cost: ᴺᵁᴸᴸ
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max_requests: ᴺᵁᴸᴸ
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max_cost: ᴺᵁᴸᴸ
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max_burst: ᴺᵁᴸᴸ
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max_speed: ᴺᵁᴸᴸ
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max_burst: ᴺᵁᴸᴸ
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throttling_us: ᴺᵁᴸᴸ
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tokens: ᴺᵁᴸᴸ
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```
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@ -66,7 +66,7 @@ Columns:
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- `inflight_cost` (`Nullable(Int64)`) - For `inflight_limit` nodes only. The sum of costs (e.g. bytes) of all resource requests dequeued from this node, that are currently in consumption state.
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- `max_requests` (`Nullable(Int64)`) - For `inflight_limit` nodes only. Upper limit for `inflight_requests` leading to constraint violation.
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- `max_cost` (`Nullable(Int64)`) - For `inflight_limit` nodes only. Upper limit for `inflight_cost` leading to constraint violation.
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- `max_burst` (`Nullable(Float64)`) - For `bandwidth_limit` nodes only. Upper limit for `tokens` available in token-bucket throttler.
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- `max_speed` (`Nullable(Float64)`) - For `bandwidth_limit` nodes only. Upper limit for bandwidth in tokens per second.
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- `max_burst` (`Nullable(Float64)`) - For `bandwidth_limit` nodes only. Upper limit for `tokens` available in token-bucket throttler.
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- `throttling_us` (`Nullable(Int64)`) - For `bandwidth_limit` nodes only. Total number of microseconds this node was in throttling state.
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- `tokens` (`Nullable(Float64)`) - For `bandwidth_limit` nodes only. Number of tokens currently available in token-bucket throttler.
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@ -79,7 +79,7 @@ graph TD
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**Possible node types:**
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* `inflight_limit` (constraint) - blocks if either number of concurrent in-flight requests exceeds `max_requests`, or their total cost exceeds `max_cost`; must have a single child.
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* `bandwidth_limit` (constraint) - blocks if burst exceeds `max_burst` (default 0) or current bandwidth exceeds `max_speed` (0 means unlimited); must have a single child.
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* `bandwidth_limit` (constraint) - blocks if current bandwidth exceeds `max_speed` (0 means unlimited) or burst exceeds `max_burst` (by default equals `max_speed`); must have a single child.
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* `fair` (policy) - selects the next request to serve from one of its children nodes according to max-min fairness; children nodes can specify `weight` (default is 1).
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* `priority` (policy) - selects the next request to serve from one of its children nodes according to static priorities (lower value means higher priority); children nodes can specify `priority` (default is 0).
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* `fifo` (queue) - leaf of the hierarchy capable of holding requests that exceed resource capacity.
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@ -18,10 +18,12 @@ namespace DB
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class ThrottlerConstraint : public ISchedulerConstraint
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{
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public:
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static constexpr double default_burst_seconds = 1.0;
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ThrottlerConstraint(EventQueue * event_queue_, const Poco::Util::AbstractConfiguration & config = emptyConfig(), const String & config_prefix = {})
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: ISchedulerConstraint(event_queue_, config, config_prefix)
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, max_burst(config.getDouble(config_prefix + ".max_burst", 0))
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, max_speed(config.getDouble(config_prefix + ".max_speed", 0))
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, max_burst(config.getDouble(config_prefix + ".max_burst", default_burst_seconds * max_speed))
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, last_update(event_queue_->now())
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, tokens(max_burst)
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{}
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@ -37,7 +39,7 @@ public:
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if (!ISchedulerNode::equals(other))
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return false;
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if (auto * o = dynamic_cast<ThrottlerConstraint *>(other))
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return max_burst == o->max_burst && max_speed == o->max_speed;
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return max_speed == o->max_speed && max_burst == o->max_burst;
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return false;
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}
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@ -137,7 +139,7 @@ public:
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std::pair<double, double> getParams() const
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{
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return {max_burst, max_speed};
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return {max_speed, max_burst};
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}
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private:
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@ -184,8 +186,8 @@ private:
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return satisfied() && child_active;
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}
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const double max_burst{0}; /// in tokens
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const double max_speed{0}; /// in tokens per second
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const double max_burst{0}; /// in tokens
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EventQueue::TimePoint last_update;
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UInt64 postponed = EventQueue::not_postponed;
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@ -41,8 +41,8 @@ NamesAndTypesList StorageSystemScheduler::getNamesAndTypes()
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{"inflight_cost", std::make_shared<DataTypeNullable>(std::make_shared<DataTypeInt64>())},
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{"max_requests", std::make_shared<DataTypeNullable>(std::make_shared<DataTypeInt64>())},
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{"max_cost", std::make_shared<DataTypeNullable>(std::make_shared<DataTypeInt64>())},
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{"max_burst", std::make_shared<DataTypeNullable>(std::make_shared<DataTypeFloat64>())},
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{"max_speed", std::make_shared<DataTypeNullable>(std::make_shared<DataTypeFloat64>())},
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{"max_burst", std::make_shared<DataTypeNullable>(std::make_shared<DataTypeFloat64>())},
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{"throttling_us", std::make_shared<DataTypeNullable>(std::make_shared<DataTypeInt64>())},
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{"tokens", std::make_shared<DataTypeNullable>(std::make_shared<DataTypeFloat64>())},
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};
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@ -76,8 +76,8 @@ void StorageSystemScheduler::fillData(MutableColumns & res_columns, ContextPtr c
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Field inflight_cost;
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Field max_requests;
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Field max_cost;
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Field max_burst;
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Field max_speed;
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Field max_burst;
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Field throttling_us;
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Field tokens;
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@ -101,7 +101,7 @@ void StorageSystemScheduler::fillData(MutableColumns & res_columns, ContextPtr c
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}
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if (auto * ptr = dynamic_cast<ThrottlerConstraint *>(node.get()))
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{
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std::tie(max_burst, max_speed) = ptr->getParams();
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std::tie(max_speed, max_burst) = ptr->getParams();
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throttling_us = ptr->getThrottlingDuration().count() / 1000;
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tokens = ptr->getTokens();
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}
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@ -116,8 +116,8 @@ void StorageSystemScheduler::fillData(MutableColumns & res_columns, ContextPtr c
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res_columns[i++]->insert(inflight_cost);
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res_columns[i++]->insert(max_requests);
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res_columns[i++]->insert(max_cost);
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res_columns[i++]->insert(max_burst);
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res_columns[i++]->insert(max_speed);
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res_columns[i++]->insert(max_burst);
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res_columns[i++]->insert(throttling_us);
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res_columns[i++]->insert(tokens);
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});
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