io.druid.indexing.overlord.autoscaling.AutoScaler Maven / Gradle / Ivy

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/*
 * Druid - a distributed column store.
 * Copyright 2012 - 2015 Metamarkets Group Inc.
 *
 * Licensed 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.indexing.overlord.autoscaling.ec2.EC2AutoScaler;

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)
})
public interface AutoScaler
{
  public int getMinNumWorkers();

  public int getMaxNumWorkers();

  public T getEnvConfig();

  public AutoScalingData provision();

  public AutoScalingData terminate(List ips);

  public AutoScalingData terminateWithIds(List ids);

  /**
   * Provides a lookup of ip addresses to node ids
   *
   * @param ips - nodes IPs
   *
   * @return node ids
   */
  public List ipToIdLookup(List ips);

  /**
   * Provides a lookup of node ids to ip addresses
   *
   * @param nodeIds - nodes ids
   *
   * @return IPs associated with the node
   */
  public List idToIpLookup(List nodeIds);
}