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// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.model.application.validation.change;
import com.yahoo.config.model.api.ConfigChangeAction;
import com.yahoo.vespa.model.VespaModel;
import com.yahoo.vespa.model.application.validation.ValidationId;
import com.yahoo.vespa.model.application.validation.ValidationOverrides;
import com.yahoo.vespa.model.container.ContainerCluster;
import com.yahoo.vespa.model.content.cluster.ContentCluster;
import java.util.Collections;
import java.util.List;
/**
* Checks that no cluster sizes are reduced too much in one go.
*
* @author bratseth
*/
public class ClusterSizeReductionValidator implements ChangeValidator {
@Override
public List<ConfigChangeAction> validate(VespaModel current, VespaModel next, ValidationOverrides overrides) {
for (ContainerCluster currentCluster : current.getContainerClusters().values()) {
ContainerCluster nextCluster = next.getContainerClusters().get(currentCluster.getName());
if (nextCluster == null) continue;
validate(currentCluster.getContainers().size(),
nextCluster.getContainers().size(),
currentCluster.getName(),
overrides);
}
for (ContentCluster currentCluster : current.getContentClusters().values()) {
ContentCluster nextCluster = next.getContentClusters().get(currentCluster.getName());
if (nextCluster == null) continue;
validate(currentCluster.getSearch().getSearchNodes().size(),
nextCluster.getSearch().getSearchNodes().size(),
currentCluster.getName(),
overrides);
}
return Collections.emptyList();
}
private void validate(int currentSize, int nextSize, String clusterName, ValidationOverrides overrides) {
// don't allow more than 50% reduction, but always allow to reduce size with 1
if ( nextSize < ((double)currentSize) * 0.5 && nextSize != currentSize - 1)
overrides.invalid(ValidationId.clusterSizeReduction,
"Size reduction in '" + clusterName + "' is too large. Current size: " + currentSize +
", new size: " + nextSize + ". New size must be at least 50% of the current size");
}
}
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