[GitHub] [druid] frnidito commented on a change in pull request #8987: Adding support for autoscaling in GCE

[GitBox <gi...@apache.org>]

frnidito commented on a change in pull request #8987: Adding support for autoscaling in GCE
URL: https://github.com/apache/druid/pull/8987#discussion_r380266280
 
 

 ##########
 File path: extensions-contrib/gce-extensions/src/main/java/org/apache/druid/indexing/overlord/autoscaling/gce/GCEAutoScaler.java
 ##########
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+/*
+ * 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();
 
 Review comment:
   The `GoogleCredential` here uses different scopes than the one(s) in the `GpcModule`

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