/**
* 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.ambari.server.controller.metrics;
import org.apache.ambari.server.controller.spi.TemporalInfo;
import org.apache.hadoop.metrics2.sink.timeline.TimelineMetric;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public abstract class MetricsDownsamplingMethod {
// Allow for 2 minute discrepancy to account for client side buffering,
// this ensures at least some data is returned in the initial few minutes.
private static final long OUT_OF_BAND_TIME_ALLOWANCE = 120000;
static Logger LOG = LoggerFactory.getLogger(MetricsDownsamplingMethod.class);
// Downsampling methods iterate over the entire metrics result to create output array.
// Passing down @TemporalInfo avoids re-iterating to filter out out of band data.
public abstract Number[][] reportMetricData(TimelineMetric metricData,
MetricsDataTransferMethod dataTransferMethod,
TemporalInfo temporalInfo);
protected boolean isWithinTemporalQueryRange(Long timestamp, TemporalInfo temporalInfo) {
boolean retVal = temporalInfo == null ||
timestamp >= (temporalInfo.getStartTimeMillis() - OUT_OF_BAND_TIME_ALLOWANCE)
&& timestamp <= temporalInfo.getEndTimeMillis();
if (!retVal && LOG.isTraceEnabled()) {
LOG.trace("Ignoring out of band metric with ts: " + timestamp + ", "
+ "temporalInfo: startTime = " + temporalInfo.getStartTimeMillis() + ","
+ " endTime = " + temporalInfo.getEndTimeMillis());
}
return retVal;
}
}