org.apache.hadoop.hbase.master.balancer.MetricsStochasticBalancerSourceImpl Maven / Gradle / Ivy
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Interfaces to be implemented in order to smooth
over hadoop version differences
/*
* 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.master.balancer;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import org.apache.hadoop.hbase.metrics.Interns;
import org.apache.hadoop.metrics2.MetricsCollector;
import org.apache.hadoop.metrics2.MetricsRecordBuilder;
import org.apache.yetus.audience.InterfaceAudience;
@InterfaceAudience.Private
public class MetricsStochasticBalancerSourceImpl extends MetricsBalancerSourceImpl
implements MetricsStochasticBalancerSource {
private static final String TABLE_FUNCTION_SEP = "_";
// Most Recently Used(MRU) cache
private static final float MRU_LOAD_FACTOR = 0.75f;
private int metricsSize = 1000;
private int mruCap = calcMruCap(metricsSize);
private final Map> stochasticCosts =
new LinkedHashMap>(mruCap, MRU_LOAD_FACTOR, true) {
private static final long serialVersionUID = 8204713453436906599L;
@Override
protected boolean removeEldestEntry(Map.Entry> eldest) {
return size() > mruCap;
}
};
private Map costFunctionDescs = new ConcurrentHashMap<>();
/**
* Calculates the mru cache capacity from the metrics size
*/
private static int calcMruCap(int metricsSize) {
return (int) Math.ceil(metricsSize / MRU_LOAD_FACTOR) + 1;
}
@Override
public void updateMetricsSize(int size) {
if (size > 0) {
metricsSize = size;
mruCap = calcMruCap(size);
}
}
/**
* Reports stochastic load balancer costs to JMX
*/
@Override
public void updateStochasticCost(String tableName, String costFunctionName, String functionDesc,
Double cost) {
if (tableName == null || costFunctionName == null || cost == null) {
return;
}
if (functionDesc != null) {
costFunctionDescs.put(costFunctionName, functionDesc);
}
synchronized (stochasticCosts) {
Map costs = stochasticCosts.get(tableName);
if (costs == null) {
costs = new ConcurrentHashMap<>();
}
costs.put(costFunctionName, cost);
stochasticCosts.put(tableName, costs);
}
}
@Override
public void getMetrics(MetricsCollector metricsCollector, boolean all) {
MetricsRecordBuilder metricsRecordBuilder = metricsCollector.addRecord(metricsName);
if (stochasticCosts != null) {
synchronized (stochasticCosts) {
for (Map.Entry> tableEntry : stochasticCosts.entrySet()) {
for (Map.Entry costEntry : tableEntry.getValue().entrySet()) {
String attrName = tableEntry.getKey() + TABLE_FUNCTION_SEP + costEntry.getKey();
Double cost = costEntry.getValue();
String functionDesc = costFunctionDescs.get(costEntry.getKey());
if (functionDesc == null) {
functionDesc = costEntry.getKey();
}
metricsRecordBuilder.addGauge(Interns.info(attrName, functionDesc), cost);
}
}
}
}
metricsRegistry.snapshot(metricsRecordBuilder, all);
}
}