| /** |
| * 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 |
| * <p> |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * <p> |
| * 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.yarn.service.monitor.probe; |
| |
| import org.apache.hadoop.yarn.api.records.ContainerStatus; |
| import org.apache.hadoop.yarn.service.component.instance.ComponentInstance; |
| import org.apache.hadoop.yarn.service.utils.ServiceRegistryUtils; |
| import org.apache.hadoop.yarn.service.utils.ServiceUtils; |
| |
| import java.io.IOException; |
| import java.util.Collections; |
| import java.util.Map; |
| |
| /** |
| * A probe that checks whether the AM has retrieved an IP for a container. |
| * Optional parameters enable a subsequent check for whether a DNS lookup can |
| * be performed for the container's hostname. Configurable properties include: |
| * |
| * dns.check.enabled - true if DNS check should be performed (default false) |
| * dns.address - optional IP:port address of DNS server to use for DNS check |
| */ |
| public class DefaultProbe extends Probe { |
| private final boolean dnsCheckEnabled; |
| private final String dnsAddress; |
| |
| public DefaultProbe(Map<String, String> props) { |
| this("Default probe: IP presence", props); |
| } |
| |
| protected DefaultProbe(String name, Map<String, String> props) { |
| this.dnsCheckEnabled = getPropertyBool(props, |
| DEFAULT_PROBE_DNS_CHECK_ENABLED, |
| DEFAULT_PROBE_DNS_CHECK_ENABLED_DEFAULT); |
| this.dnsAddress = props.get(DEFAULT_PROBE_DNS_ADDRESS); |
| String additionalName = ""; |
| if (dnsCheckEnabled) { |
| if (dnsAddress == null) { |
| additionalName = " with DNS checking"; |
| } else { |
| additionalName = " with DNS checking and DNS server address " + |
| dnsAddress; |
| } |
| } |
| setName(name + additionalName); |
| } |
| |
| public static DefaultProbe create() throws IOException { |
| return new DefaultProbe(Collections.emptyMap()); |
| } |
| |
| public static DefaultProbe create(Map<String, String> props) throws |
| IOException { |
| return new DefaultProbe(props); |
| } |
| |
| @Override |
| public ProbeStatus ping(ComponentInstance instance) { |
| ProbeStatus status = new ProbeStatus(); |
| |
| ContainerStatus containerStatus = instance.getContainerStatus(); |
| if (containerStatus == null || ServiceUtils.isEmpty(containerStatus |
| .getIPs())) { |
| status.fail(this, new IOException( |
| instance.getCompInstanceName() + ": IP is not available yet")); |
| return status; |
| } |
| |
| String hostname = instance.getHostname(); |
| if (dnsCheckEnabled && !ServiceRegistryUtils.registryDNSLookupExists( |
| dnsAddress, hostname)) { |
| status.fail(this, new IOException( |
| instance.getCompInstanceName() + ": DNS checking is enabled, but " + |
| "lookup for " + hostname + " is not available yet")); |
| return status; |
| } |
| |
| status.succeed(this); |
| return status; |
| } |
| |
| protected boolean isDnsCheckEnabled() { |
| return dnsCheckEnabled; |
| } |
| } |