hadoop BalancerMetrics 源码
haddop BalancerMetrics 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/balancer/BalancerMetrics.java
/**
* 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.hdfs.server.balancer;
import org.apache.hadoop.metrics2.annotation.Metric;
import org.apache.hadoop.metrics2.annotation.Metrics;
import org.apache.hadoop.metrics2.lib.DefaultMetricsSystem;
import org.apache.hadoop.metrics2.lib.MutableGaugeInt;
import org.apache.hadoop.metrics2.lib.MutableGaugeLong;
/**
* Metrics for individual Balancer.
*/
@Metrics(about="Balancer metrics", context="dfs")
final class BalancerMetrics {
private final Balancer balancer;
@Metric("If a balancer iterate is running")
private MutableGaugeInt iterateRunning;
@Metric("Bytes left to move to make cluster balanced")
private MutableGaugeLong bytesLeftToMove;
@Metric("Number of under utilized nodes")
private MutableGaugeInt numOfUnderUtilizedNodes;
@Metric("Number of over utilized nodes")
private MutableGaugeInt numOfOverUtilizedNodes;
private BalancerMetrics(Balancer b) {
this.balancer = b;
}
public static BalancerMetrics create(Balancer b) {
BalancerMetrics m = new BalancerMetrics(b);
return DefaultMetricsSystem.instance().register(
m.getName(), null, m);
}
String getName() {
return "Balancer-" + balancer.getNnc().getBlockpoolID();
}
@Metric("Bytes that already moved in current doBalance run.")
public long getBytesMovedInCurrentRun() {
return balancer.getNnc().getBytesMoved().get();
}
void setIterateRunning(boolean iterateRunning) {
this.iterateRunning.set(iterateRunning ? 1 : 0);
}
void setBytesLeftToMove(long bytesLeftToMove) {
this.bytesLeftToMove.set(bytesLeftToMove);
}
void setNumOfUnderUtilizedNodes(int numOfUnderUtilizedNodes) {
this.numOfUnderUtilizedNodes.set(numOfUnderUtilizedNodes);
}
void setNumOfOverUtilizedNodes(int numOfOverUtilizedNodes) {
this.numOfOverUtilizedNodes.set(numOfOverUtilizedNodes);
}
}
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