clintropolis commented on a change in pull request #8987: Adding support for autoscaling in GCE URL: https://github.com/apache/druid/pull/8987#discussion_r378092985
########## File path: extensions-contrib/gce-extensions/src/main/java/org/apache/druid/indexing/overlord/autoscaling/gce/GCEAutoScaler.java ########## @@ -0,0 +1,496 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF 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 org.apache.druid.indexing.overlord.autoscaling.gce; + +import com.fasterxml.jackson.annotation.JacksonInject; +import com.fasterxml.jackson.annotation.JsonCreator; +import com.fasterxml.jackson.annotation.JsonProperty; +import com.fasterxml.jackson.annotation.JsonTypeName; +import com.google.api.client.googleapis.auth.oauth2.GoogleCredential; +import com.google.api.client.googleapis.javanet.GoogleNetHttpTransport; +import com.google.api.client.http.HttpTransport; +import com.google.api.client.json.JsonFactory; +import com.google.api.client.json.jackson2.JacksonFactory; +import com.google.api.services.compute.Compute; +import com.google.api.services.compute.ComputeScopes; +import com.google.api.services.compute.model.Instance; +import com.google.api.services.compute.model.InstanceGroupManagersDeleteInstancesRequest; +import com.google.api.services.compute.model.InstanceGroupManagersListManagedInstancesResponse; +import com.google.api.services.compute.model.InstanceList; +import com.google.api.services.compute.model.ManagedInstance; +import com.google.api.services.compute.model.Operation; +import com.google.common.net.InetAddresses; +import org.apache.druid.indexing.overlord.autoscaling.AutoScaler; +import org.apache.druid.indexing.overlord.autoscaling.AutoScalingData; +import org.apache.druid.indexing.overlord.autoscaling.SimpleWorkerProvisioningConfig; +import org.apache.druid.java.util.emitter.EmittingLogger; + +import java.io.IOException; +import java.security.GeneralSecurityException; +import java.util.ArrayList; +import java.util.List; +import java.util.Locale; + +/** + * This module permits the autoscaling of the workers in GCE + * + * General notes: + * - The IPs are IPs as in Internet Protocol, and they look like 1.2.3.4 + * - The IDs are the names of the instances of instances created, they look like prefix-abcd, + * where the prefix is chosen by you and abcd is a suffix assigned by GCE + */ +@JsonTypeName("gce") +public class GCEAutoScaler implements AutoScaler<GCEEnvironmentConfig> +{ + private static final EmittingLogger log = new EmittingLogger(GCEAutoScaler.class); + + private final GCEEnvironmentConfig envConfig; + private final int minNumWorkers; + private final int maxNumWorkers; + private final SimpleWorkerProvisioningConfig config; // For future use + + private Compute cachedComputeService = null; + + @JsonCreator + public GCEAutoScaler( + @JsonProperty("minNumWorkers") int minNumWorkers, + @JsonProperty("maxNumWorkers") int maxNumWorkers, + @JsonProperty("envConfig") GCEEnvironmentConfig envConfig, + @JacksonInject SimpleWorkerProvisioningConfig config + ) + { + this.minNumWorkers = minNumWorkers; + this.maxNumWorkers = maxNumWorkers; + this.envConfig = envConfig; + this.config = config; + } + + /** + * CAVEAT: this is meant to be used only for testing passing a mock version of Compute + */ + public GCEAutoScaler( + int minNumWorkers, + int maxNumWorkers, + GCEEnvironmentConfig envConfig, + SimpleWorkerProvisioningConfig config, + Compute compute + ) + { + this(minNumWorkers, maxNumWorkers, envConfig, config); + this.cachedComputeService = compute; + } + + @Override + @JsonProperty + public int getMinNumWorkers() + { + return minNumWorkers; + } + + @Override + @JsonProperty + public int getMaxNumWorkers() + { + return maxNumWorkers; + } + + @Override + @JsonProperty + public GCEEnvironmentConfig getEnvConfig() + { + return envConfig; + } + + private synchronized Compute createComputeService() + throws IOException, GeneralSecurityException, InterruptedException + { + final int max_retries = 5; + final long retries_interval = 5 * 1000; // 5 secs. + + int retries = 0; + while (cachedComputeService == null && retries < max_retries) { + if (retries > 0) { + Thread.sleep(retries_interval); + } + + log.info("Creating new ComputeService [%d/%d]", retries + 1, max_retries); + + try { + HttpTransport httpTransport = GoogleNetHttpTransport.newTrustedTransport(); + JsonFactory jsonFactory = JacksonFactory.getDefaultInstance(); + GoogleCredential credential = GoogleCredential.getApplicationDefault( + httpTransport, + jsonFactory + ); + if (credential.createScopedRequired()) { + List<String> scopes = new ArrayList<>(); + scopes.add(ComputeScopes.CLOUD_PLATFORM); + scopes.add(ComputeScopes.COMPUTE); + credential = credential.createScoped(scopes); + } + + if (credential.getClientAuthentication() != null) { + log.error("Not using a service account, terminating"); + System.exit(1); + } + + cachedComputeService = new Compute.Builder(httpTransport, jsonFactory, credential) + .setApplicationName("DruidAutoscaler") + .build(); + + retries++; + } + catch (Throwable e) { + log.error(e, "Got Exception in creating the ComputeService"); + throw e; + } + } + return cachedComputeService; + } + + // Used to wait for an operation to finish + private Operation.Error waitForOperationEnd( + Compute compute, + Operation operation) throws Exception + { + final long pollInterval = 5 * 1000; // 5 sec + + String status = operation.getStatus(); + String opId = operation.getName(); + while (operation != null && !"DONE".equals(status)) { + Thread.sleep(pollInterval); + Compute.ZoneOperations.Get get = compute.zoneOperations().get( + envConfig.getProjectId(), + envConfig.getZoneName(), + opId + ); + operation = get.execute(); + if (operation != null) { + status = operation.getStatus(); + } + } + return operation == null ? null : operation.getError(); + } + + /** + * When called resizes envConfig.getManagedInstanceGroupName() increasing it by creating + * envConfig.getNumInstances() new workers (unless the maximum is reached). Return the + * IDs of the workers created + */ + @Override + public AutoScalingData provision() + { + final String project = envConfig.getProjectId(); + final String zone = envConfig.getZoneName(); + final int numInstances = envConfig.getNumInstances(); + final String managedInstanceGroupName = envConfig.getManagedInstanceGroupName(); + + try { + List<String> before = getRunningInstances(); + log.debug("Existing instances [%s]", String.join(",", before)); + + int toSize = Math.min(before.size() + numInstances, getMaxNumWorkers()); + if (before.size() >= toSize) { + // nothing to scale + return new AutoScalingData(new ArrayList<>()); + } + log.info("Asked to provision instances, will resize to %d", toSize); + + Compute computeService = createComputeService(); + Compute.InstanceGroupManagers.Resize request = + computeService.instanceGroupManagers().resize(project, zone, + managedInstanceGroupName, toSize); + + Operation response = request.execute(); + Operation.Error err = waitForOperationEnd(computeService, response); + if (err == null || err.isEmpty()) { + List<String> after = getRunningInstances(); + after.removeAll(before); // these should be the new ones + log.debug("Added instances [%s]", String.join(",", after)); + return new AutoScalingData(after); + } else { + log.error("Unable to provision instances: %s", err.toPrettyString()); + } + } + catch (Exception e) { + log.error(e, "Unable to provision any gce instances."); + } + + return new AutoScalingData(new ArrayList<>()); + } + + /** + * Terminats the instances in the list of IPs provided by the caller Review comment: nit: 'Terminats' -> 'Terminates' ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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