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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.model.content.cluster;
import com.yahoo.vespa.model.builder.xml.dom.ModelElement;
import com.yahoo.vespa.model.content.IndexedHierarchicDistributionValidator;
import com.yahoo.vespa.model.content.Redundancy;
/**
* Builds redundancy config for a content cluster.
*/
public class RedundancyBuilder {
Integer initialRedundancy = 2;
Integer finalRedundancy = 3;
Integer readyCopies = 2;
RedundancyBuilder(ModelElement clusterXml) {
ModelElement redundancyElement = clusterXml.child("redundancy");
if (redundancyElement != null) {
initialRedundancy = redundancyElement.integerAttribute("reply-after");
finalRedundancy = (int) redundancyElement.asLong();
if (initialRedundancy == null) {
initialRedundancy = finalRedundancy;
} else {
if (finalRedundancy < initialRedundancy) {
throw new IllegalArgumentException("Final redundancy must be higher than or equal to initial redundancy");
}
}
readyCopies = clusterXml.childAsInteger("engine.proton.searchable-copies");
if (readyCopies == null) {
readyCopies = Math.min(finalRedundancy, 2);
}
if (readyCopies > finalRedundancy) {
throw new IllegalArgumentException("Number of searchable copies can not be higher than final redundancy");
}
}
}
public Redundancy build(String clusterName, boolean isHosted, int subGroups, int leafGroups, int totalNodes) {
if (isHosted) {
return new Redundancy(initialRedundancy, finalRedundancy, readyCopies, leafGroups, totalNodes);
} else {
subGroups = Math.max(1, subGroups);
IndexedHierarchicDistributionValidator.validateThatLeafGroupsCountIsAFactorOfRedundancy(clusterName, finalRedundancy, subGroups);
IndexedHierarchicDistributionValidator.validateThatReadyCopiesIsCompatibleWithRedundancy(clusterName, finalRedundancy, readyCopies, subGroups);
return new Redundancy(initialRedundancy/leafGroups, finalRedundancy/leafGroups, readyCopies/leafGroups, leafGroups, totalNodes);
}
}
}
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