io.cdap.cdap.internal.app.runtime.batch.TaskMetricsWriter Maven / Gradle / Ivy
/*
* Copyright © 2017 Cask Data, Inc.
*
* Licensed 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 io.cdap.cdap.internal.app.runtime.batch;
import io.cdap.cdap.api.metrics.MetricsContext;
import io.cdap.cdap.app.metrics.MapReduceMetrics;
import org.apache.hadoop.mapreduce.TaskCounter;
import org.apache.hadoop.mapreduce.TaskInputOutputContext;
import java.util.Map;
/**
* Base class for gathering statistics from a running map/reduce task through its counters and for writing the data to
* the metrics system.
*/
public abstract class TaskMetricsWriter {
private final MetricsContext metricsContext;
private final TaskInputOutputContext taskContext;
TaskMetricsWriter(MetricsContext metricsContext, TaskInputOutputContext taskContext) {
this.metricsContext = metricsContext;
this.taskContext = taskContext;
}
public void reportMetrics() {
metricsContext.gauge(MapReduceMetrics.METRIC_TASK_COMPLETION, (long) (taskContext.getProgress() * 100));
for (Map.Entry counterEntry : getTaskCounters().entrySet()) {
metricsContext.gauge(counterEntry.getKey(), getTaskCounter(counterEntry.getValue()));
}
}
private long getTaskCounter(TaskCounter taskCounter) {
return taskContext.getCounter(TaskCounter.class.getName(), taskCounter.name()).getValue();
}
protected abstract Map getTaskCounters();
}