[GitHub] [hbase] ndimiduk commented on a diff in pull request #4979: HBASE-27574 Implement ClusterManager interface for Kubernetes

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

ndimiduk commented on code in PR #4979:
URL: https://github.com/apache/hbase/pull/4979#discussion_r1082207440


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hbase-it/src/test/java/org/apache/hadoop/hbase/KubernetesClusterManager.java:
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@@ -0,0 +1,258 @@
+/*
+ * 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.hadoop.hbase;
+
+import com.google.gson.JsonSyntaxException;
+import io.kubernetes.client.openapi.ApiClient;
+import io.kubernetes.client.openapi.ApiException;
+import io.kubernetes.client.openapi.apis.CoreV1Api;
+import io.kubernetes.client.openapi.models.V1ObjectMeta;
+import io.kubernetes.client.openapi.models.V1Pod;
+import io.kubernetes.client.openapi.models.V1PodList;
+import io.kubernetes.client.util.ClientBuilder;
+import java.io.IOException;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Optional;
+import java.util.Set;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.conf.Configured;
+import org.apache.hadoop.hbase.procedure2.util.StringUtils;
+import org.apache.yetus.audience.InterfaceAudience;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Cluster manager for K8s context. Supports taking destructive actions, and checking for the
+ * presence of a running process. Assumes services are running behind some type of `Deployment` that
+ * will handle starting replacement processes after a destructive action. Requires that the
+ * configuration specify a Kubernetes namespace.
+ * </p>
+ * Note that the k8s java client is a bit dodgy unable to read responses when we call delete (i.e.
+ * kill) and sometimes when checking isRunning; makes for noisy logs and sometimes the operations
+ * overrun each other but generally succeed.
+ */
+@InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.CONFIG)
+public class KubernetesClusterManager extends Configured implements ClusterManager {
+  private static final Logger LOG = LoggerFactory.getLogger(KubernetesClusterManager.class);
+
+  private static final String NAMESPACE_CONF_KEY =
+    KubernetesClusterManager.class.getCanonicalName() + ".namespace";
+  private static final String ZOOKEEPER_ROLE_SELECTOR_CONF_KEY =
+    KubernetesClusterManager.class.getCanonicalName() + ".zookeeper_role";
+  private static final String NAMENODE_ROLE_SELECTOR_CONF_KEY =
+    KubernetesClusterManager.class.getCanonicalName() + ".namenode_role";
+  private static final String JOURNALNODE_ROLE_SELECTOR_CONF_KEY =
+    KubernetesClusterManager.class.getCanonicalName() + ".journalnode_role";
+  private static final String DATANODE_ROLE_SELECTOR_CONF_KEY =
+    KubernetesClusterManager.class.getCanonicalName() + ".datanode_role";
+  private static final String MASTER_ROLE_SELECTOR_CONF_KEY =
+    KubernetesClusterManager.class.getCanonicalName() + ".master_role";
+  private static final String REGIONSERVER_ROLE_SELECTOR_CONF_KEY =
+    KubernetesClusterManager.class.getCanonicalName() + ".regionserver_role";
+  private static final Set<ServiceType> SUPPORTED_SERVICE_TYPES = buildSupportedServiceTypesSet();
+
+  private CoreV1Api api;
+  private String namespace;
+
+  private static Set<ServiceType> buildSupportedServiceTypesSet() {
+    final Set<ServiceType> set = new HashSet<>();
+    set.add(ServiceType.ZOOKEEPER_SERVER);
+    set.add(ServiceType.HADOOP_NAMENODE);
+    set.add(ServiceType.HADOOP_JOURNALNODE);
+    set.add(ServiceType.HADOOP_DATANODE);
+    set.add(ServiceType.HBASE_MASTER);
+    set.add(ServiceType.HBASE_REGIONSERVER);
+    return Collections.unmodifiableSet(set);
+  }
+
+  @Override
+  public void setConf(Configuration configuration) {
+    // This is usually called from the constructor (The call to super goes to
+    // Configured which does a setConf in its construction) but the configuration
+    // null at that time. After construction, setConf is called again.
+    // Assume single-thread doing ClusterManager setup.
+    if (configuration == null) {
+      LOG.debug("Skipping because provided configuration=null");
+      return;
+    }
+    if (getConf() != null) {
+      LOG.debug("Skipping because configuration already set, getConf={}", getConf());
+      return;
+    }
+    super.setConf(configuration);
+    this.namespace = configuration.get(NAMESPACE_CONF_KEY);

Review Comment:
   What default namespace would you propose? I guess, `default` ?



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