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// Copyright Verizon Media. 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.vespa.clustercontroller.core.hostinfo.ContentNode;
import java.util.Collection;
import java.util.Map;
import java.util.Optional;
/**
* Represents resource usage stats for the cluster that are exposed as metrics.
*/
public class ResourceUsageStats {
// Max disk utilization (usage / limit) among all content nodes.
private final double maxDiskUtilization;
// Max memory utilization (usage / limit) among all content nodes.
private final double maxMemoryUtilization;
// The number of content nodes that are above at least one resource limit.
// When this is above zero feed is blocked in the cluster.
private final int nodesAboveLimit;
private static final String diskResource = "disk";
private static final String memoryResource = "memory";
public ResourceUsageStats() {
this.maxDiskUtilization = 0.0;
this.maxMemoryUtilization = 0.0;
this.nodesAboveLimit = 0;
}
public ResourceUsageStats(double maxDiskUtilization,
double maxMemoryUtilization,
int nodesAboveLimit) {
this.maxDiskUtilization = maxDiskUtilization;
this.maxMemoryUtilization = maxMemoryUtilization;
this.nodesAboveLimit = nodesAboveLimit;
}
public double getMaxDiskUtilization() {
return maxDiskUtilization;
}
public double getMaxMemoryUtilization() {
return maxMemoryUtilization;
}
public int getNodesAboveLimit() {
return nodesAboveLimit;
}
public static ResourceUsageStats calculateFrom(Collection<NodeInfo> nodeInfos,
Map<String, Double> feedBlockLimits,
Optional<ClusterStateBundle.FeedBlock> feedBlock) {
double maxDiskUsage = 0.0;
double maxMemoryUsage = 0.0;
for (NodeInfo info : nodeInfos) {
if (info.isStorage()) {
var node = info.getHostInfo().getContentNode();
maxDiskUsage = Double.max(maxDiskUsage, resourceUsageOf(diskResource, node));
maxMemoryUsage = Double.max(maxMemoryUsage, resourceUsageOf(memoryResource, node));
}
}
return new ResourceUsageStats(maxDiskUsage / limitOf(diskResource, feedBlockLimits),
maxMemoryUsage / limitOf(memoryResource, feedBlockLimits),
calculateNodesAboveLimit(feedBlock));
}
private static double resourceUsageOf(String type, ContentNode node) {
var result = node.resourceUsageOf(type);
return result.isPresent() ? result.get().getUsage() : 0.0;
}
private static int calculateNodesAboveLimit(Optional<ClusterStateBundle.FeedBlock> feedBlock) {
if (!feedBlock.isPresent()) {
return 0;
}
var exhaustions = feedBlock.get().getConcreteExhaustions();
return (int) exhaustions.stream().map(resource -> resource.node).distinct().count();
}
private static double limitOf(String type, Map<String, Double> limits) {
var result = limits.get(type);
return (result != null) ? result : 1.0;
}
}
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