io.druid.indexing.overlord.autoscaling.AutoScaler Maven / Gradle / Ivy
/*
* Licensed to Metamarkets Group Inc. (Metamarkets) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Metamarkets licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package io.druid.indexing.overlord.autoscaling;
import com.fasterxml.jackson.annotation.JsonSubTypes;
import com.fasterxml.jackson.annotation.JsonTypeInfo;
import io.druid.guice.annotations.ExtensionPoint;
import io.druid.indexing.overlord.autoscaling.ec2.EC2AutoScaler;
import javax.annotation.Nullable;
import java.util.List;
/**
* The AutoScaler has the actual methods to provision and terminate worker nodes.
*/
@JsonTypeInfo(use = JsonTypeInfo.Id.NAME, property = "type", defaultImpl = NoopAutoScaler.class)
@JsonSubTypes(value = {
@JsonSubTypes.Type(name = "ec2", value = EC2AutoScaler.class)
})
@ExtensionPoint
public interface AutoScaler
{
int getMinNumWorkers();
int getMaxNumWorkers();
T getEnvConfig();
@Nullable
AutoScalingData provision();
@Nullable
AutoScalingData terminate(List ips);
@Nullable
AutoScalingData terminateWithIds(List ids);
/**
* Provides a lookup of ip addresses to node ids
*
* @param ips - nodes IPs
*
* @return node ids
*/
List ipToIdLookup(List ips);
/**
* Provides a lookup of node ids to ip addresses
*
* @param nodeIds - nodes ids
*
* @return IPs associated with the node
*/
List idToIpLookup(List nodeIds);
}