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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.clustercontroller.core;
import com.yahoo.vdslib.distribution.ConfiguredNode;
import com.yahoo.vdslib.distribution.Distribution;
import com.yahoo.vespa.config.content.StorDistributionConfig;
import java.util.Collection;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.IntStream;
public class DistributionBuilder {
// TODO support nested groups
static class GroupBuilder {
final int groupCount;
List<Integer> groupsWithNodeCount;
GroupBuilder(int groupCount) {
this.groupCount = groupCount;
}
GroupBuilder(int... nodeCounts) {
this.groupCount = nodeCounts.length;
this.groupsWithNodeCount = IntStream.of(nodeCounts).boxed()
.toList();
}
GroupBuilder eachWithNodeCount(int nodeCount) {
groupsWithNodeCount = IntStream.range(0, groupCount)
.map(i -> nodeCount).boxed()
.toList();
return this;
}
int totalNodeCount() {
return groupsWithNodeCount.stream().reduce(0, Integer::sum);
}
String groupDistributionSpec() {
return IntStream.range(0, groupCount).mapToObj(i -> "1")
.collect(Collectors.joining("|")) + "|*";
}
}
static GroupBuilder withGroups(int groups) {
return new GroupBuilder(groups);
}
static GroupBuilder withGroupNodes(int... nodeCounts) {
return new GroupBuilder(nodeCounts);
}
static List<ConfiguredNode> buildConfiguredNodes(int nodeCount) {
return IntStream.range(0, nodeCount)
.mapToObj(i -> new ConfiguredNode(i, false))
.toList();
}
private static StorDistributionConfig.Group.Nodes.Builder configuredNode(ConfiguredNode node) {
StorDistributionConfig.Group.Nodes.Builder builder = new StorDistributionConfig.Group.Nodes.Builder();
builder.index(node.index());
return builder;
}
private static StorDistributionConfig.Group.Builder configuredGroup(
String name, int index, Collection<ConfiguredNode> nodes) {
StorDistributionConfig.Group.Builder builder = new StorDistributionConfig.Group.Builder();
builder.name(name);
builder.index(Integer.toString(index));
nodes.forEach(n -> builder.nodes(configuredNode(n)));
return builder;
}
public static Distribution forFlatCluster(int nodeCount) {
Collection<ConfiguredNode> nodes = buildConfiguredNodes(nodeCount);
StorDistributionConfig.Builder configBuilder = new StorDistributionConfig.Builder();
configBuilder.redundancy(2);
configBuilder.group(configuredGroup("bar", 0, nodes));
return new Distribution(new StorDistributionConfig(configBuilder));
}
static Distribution forHierarchicCluster(GroupBuilder root) {
List<ConfiguredNode> nodes = buildConfiguredNodes(root.totalNodeCount());
StorDistributionConfig.Builder configBuilder = new StorDistributionConfig.Builder();
configBuilder.redundancy(2);
StorDistributionConfig.Group.Builder rootBuilder = new StorDistributionConfig.Group.Builder();
rootBuilder.name("invalid");
rootBuilder.index("invalid");
rootBuilder.partitions(root.groupDistributionSpec());
configBuilder.group(rootBuilder);
int offset = 0;
for (int group = 0; group < root.groupsWithNodeCount.size(); ++group) {
int nodeCount = root.groupsWithNodeCount.get(group);
StorDistributionConfig.Group.Builder groupBuilder
= configuredGroup("group_" + (group + 1), group + 1, nodes.subList(offset, offset + nodeCount));
configBuilder.group(groupBuilder);
offset += nodeCount;
}
return new Distribution(new StorDistributionConfig(configBuilder));
}
}
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