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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.model.content;
/**
* Tuning of dispatching to content nodes, see the
* <a href="https://docs.vespa.ai/en/reference/services-content.html#dispatch-tuning">dispatch tuning documentation</a>.
*
* @author Simon Thoresen Hult
*/
public class DispatchTuning {
public static final DispatchTuning empty = new DispatchTuning.Builder().build();
public enum DispatchPolicy {
ROUNDROBIN,
LATENCY_AMORTIZED_OVER_REQUESTS,
LATENCY_AMORTIZED_OVER_TIME,
BEST_OF_RANDOM_2,
ADAPTIVE
}
private final Integer maxHitsPerPartition;
private final DispatchPolicy dispatchPolicy;
private final Double minActiveDocsCoverage;
public Double getTopkProbability() {
return topkProbability;
}
private final Double topkProbability;
private DispatchTuning(Builder builder) {
maxHitsPerPartition = builder.maxHitsPerPartition;
dispatchPolicy = builder.dispatchPolicy;
minActiveDocsCoverage = builder.minActiveDocsCoverage;
topkProbability = builder.topKProbability;
}
/** Returns the max number of hits to fetch from each partition, or null to fetch all */
public Integer getMaxHitsPerPartition() { return maxHitsPerPartition; }
/** Returns the policy used to select which group to dispatch a query to */
public DispatchPolicy getDispatchPolicy() { return dispatchPolicy; }
/** Returns the percentage of documents which must be available in a group for that group to receive queries */
public Double getMinActiveDocsCoverage() { return minActiveDocsCoverage; }
public static class Builder {
private Integer maxHitsPerPartition;
private DispatchPolicy dispatchPolicy;
private Double minActiveDocsCoverage;
private Double topKProbability;
public DispatchTuning build() {
return new DispatchTuning(this);
}
public Builder setMaxHitsPerPartition(Integer maxHitsPerPartition) {
this.maxHitsPerPartition = maxHitsPerPartition;
return this;
}
public Builder setTopKProbability(Double topKProbability) {
this.topKProbability = topKProbability;
return this;
}
public Builder setDispatchPolicy(String policy) {
if (policy != null)
dispatchPolicy = toDispatchPolicy(policy);
return this;
}
public static DispatchPolicy toDispatchPolicy(String policy) {
switch (policy.toLowerCase()) {
case "adaptive": case "random": return DispatchPolicy.ADAPTIVE; // TODO: Deprecate 'random' on Vespa 9
case "round-robin": return DispatchPolicy.ROUNDROBIN;
case "latency-amortized-over-requests" : return DispatchPolicy.LATENCY_AMORTIZED_OVER_REQUESTS;
case "latency-amortized-over-time" : return DispatchPolicy.LATENCY_AMORTIZED_OVER_TIME;
case "best-of-random-2" : return DispatchPolicy.BEST_OF_RANDOM_2;
default: throw new IllegalArgumentException("Unknown dispatch policy '" + policy + "'");
}
}
public Builder setMinActiveDocsCoverage(Double minCoverage) {
this.minActiveDocsCoverage = minCoverage;
return this;
}
}
}
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