hadoop NullStateStoreMetrics 源码
haddop NullStateStoreMetrics 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/metrics/NullStateStoreMetrics.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.federation.metrics;
/**
* Implementation of the State Store metrics which does not do anything.
* This is used when the metrics are disabled (e.g., tests).
*/
public class NullStateStoreMetrics extends StateStoreMetrics {
public void addRead(long latency) {}
public long getReadOps() {
return -1;
}
public double getReadAvg() {
return -1;
}
public void addWrite(long latency) {}
public long getWriteOps() {
return -1;
}
public double getWriteAvg() {
return -1;
}
public void addFailure(long latency) { }
public long getFailureOps() {
return -1;
}
public double getFailureAvg() {
return -1;
}
public void addRemove(long latency) {}
public long getRemoveOps() {
return -1;
}
public double getRemoveAvg() {
return -1;
}
public void setCacheSize(String name, int size) {}
public void reset() {}
public void shutdown() {}
}
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