/*
* 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.nifi.reporting.ambari;
import com.yammer.metrics.core.VirtualMachineMetrics;
import org.apache.nifi.annotation.documentation.CapabilityDescription;
import org.apache.nifi.annotation.documentation.Tags;
import org.apache.nifi.annotation.lifecycle.OnScheduled;
import org.apache.nifi.components.PropertyDescriptor;
import org.apache.nifi.controller.ConfigurationContext;
import org.apache.nifi.controller.status.ProcessGroupStatus;
import org.apache.nifi.processor.util.StandardValidators;
import org.apache.nifi.reporting.AbstractReportingTask;
import org.apache.nifi.reporting.ReportingContext;
import org.apache.nifi.reporting.ambari.api.MetricsBuilder;
import org.apache.nifi.reporting.ambari.metrics.MetricsService;
import javax.json.Json;
import javax.json.JsonBuilderFactory;
import javax.json.JsonObject;
import javax.ws.rs.client.Client;
import javax.ws.rs.client.ClientBuilder;
import javax.ws.rs.client.Entity;
import javax.ws.rs.client.Invocation;
import javax.ws.rs.client.WebTarget;
import javax.ws.rs.core.Response;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;
@Tags({"reporting", "ambari", "metrics"})
@CapabilityDescription("Publishes metrics from NiFi to Ambari Metrics Service (AMS). Due to how the Ambari Metrics Service " +
"works, this reporting task should be scheduled to run every 60 seconds. Each iteration it will send the metrics " +
"from the previous iteration, and calculate the current metrics to be sent on next iteration. Scheduling this reporting " +
"task at a frequency other than 60 seconds may produce unexpected results.")
public class AmbariReportingTask extends AbstractReportingTask {
static final PropertyDescriptor METRICS_COLLECTOR_URL = new PropertyDescriptor.Builder()
.name("Metrics Collector URL")
.description("The URL of the Ambari Metrics Collector Service")
.required(true)
.expressionLanguageSupported(true)
.defaultValue("http://localhost:6188/ws/v1/timeline/metrics")
.addValidator(StandardValidators.URL_VALIDATOR)
.build();
static final PropertyDescriptor APPLICATION_ID = new PropertyDescriptor.Builder()
.name("Application ID")
.description("The Application ID to be included in the metrics sent to Ambari")
.required(true)
.expressionLanguageSupported(true)
.defaultValue("nifi")
.addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
.build();
static final PropertyDescriptor HOSTNAME = new PropertyDescriptor.Builder()
.name("Hostname")
.description("The Hostname of this NiFi instance to be included in the metrics sent to Ambari")
.required(true)
.expressionLanguageSupported(true)
.defaultValue("${hostname(true)}")
.addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
.build();
static final PropertyDescriptor PROCESS_GROUP_ID = new PropertyDescriptor.Builder()
.name("Process Group ID")
.description("If specified, the reporting task will send metrics about this process group only. If"
+ " not, the root process group is used and global metrics are sent.")
.required(false)
.expressionLanguageSupported(true)
.addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
.build();
private volatile Client client;
private volatile JsonBuilderFactory factory;
private volatile VirtualMachineMetrics virtualMachineMetrics;
private volatile JsonObject previousMetrics = null;
private final MetricsService metricsService = new MetricsService();
@Override
protected List<PropertyDescriptor> getSupportedPropertyDescriptors() {
final List<PropertyDescriptor> properties = new ArrayList<>();
properties.add(METRICS_COLLECTOR_URL);
properties.add(APPLICATION_ID);
properties.add(HOSTNAME);
properties.add(PROCESS_GROUP_ID);
return properties;
}
@OnScheduled
public void setup(final ConfigurationContext context) throws IOException {
final Map<String, ?> config = Collections.emptyMap();
factory = Json.createBuilderFactory(config);
client = createClient();
virtualMachineMetrics = VirtualMachineMetrics.getInstance();
previousMetrics = null;
}
// used for testing to allow tests to override the client
protected Client createClient() {
return ClientBuilder.newClient();
}
@Override
public void onTrigger(final ReportingContext context) {
final String metricsCollectorUrl = context.getProperty(METRICS_COLLECTOR_URL).evaluateAttributeExpressions().getValue();
final String applicationId = context.getProperty(APPLICATION_ID).evaluateAttributeExpressions().getValue();
final String hostname = context.getProperty(HOSTNAME).evaluateAttributeExpressions().getValue();
final boolean pgIdIsSet = context.getProperty(PROCESS_GROUP_ID).isSet();
final String processGroupId = pgIdIsSet ? context.getProperty(PROCESS_GROUP_ID).evaluateAttributeExpressions().getValue() : null;
final long start = System.currentTimeMillis();
// send the metrics from last execution
if (previousMetrics != null) {
final WebTarget metricsTarget = client.target(metricsCollectorUrl);
final Invocation.Builder invocation = metricsTarget.request();
final Entity<String> entity = Entity.json(previousMetrics.toString());
getLogger().debug("Sending metrics {} to Ambari", new Object[]{entity.getEntity()});
final Response response = invocation.post(entity);
if (response.getStatus() == Response.Status.OK.getStatusCode()) {
final long completedMillis = TimeUnit.NANOSECONDS.toMillis(System.currentTimeMillis() - start);
getLogger().info("Successfully sent metrics to Ambari in {} ms", new Object[]{completedMillis});
} else {
final String responseEntity = response.hasEntity() ? response.readEntity(String.class) : "unknown error";
getLogger().error("Error sending metrics to Ambari due to {} - {}", new Object[]{response.getStatus(), responseEntity});
}
}
// calculate the current metrics, but store them to be sent next time
final ProcessGroupStatus status = processGroupId == null ? context.getEventAccess().getControllerStatus() : context.getEventAccess().getGroupStatus(processGroupId);
if(status != null) {
final Map<String,String> statusMetrics = metricsService.getMetrics(status, pgIdIsSet);
final Map<String,String> jvmMetrics = metricsService.getMetrics(virtualMachineMetrics);
final MetricsBuilder metricsBuilder = new MetricsBuilder(factory);
final JsonObject metricsObject = metricsBuilder
.applicationId(applicationId)
.instanceId(status.getId())
.hostname(hostname)
.timestamp(start)
.addAllMetrics(statusMetrics)
.addAllMetrics(jvmMetrics)
.build();
previousMetrics = metricsObject;
} else {
getLogger().error("No process group status with ID = {}", new Object[]{processGroupId});
previousMetrics = null;
}
}
}