hadoop ReconfigurationUtil 源码
haddop ReconfigurationUtil 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/conf/ReconfigurationUtil.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.conf;
import java.util.Map;
import java.util.Collection;
import java.util.HashMap;
public class ReconfigurationUtil {
public static class PropertyChange {
public String prop;
public String oldVal;
public String newVal;
public PropertyChange(String prop, String newVal, String oldVal) {
this.prop = prop;
this.newVal = newVal;
this.oldVal = oldVal;
}
}
public static Collection<PropertyChange>
getChangedProperties(Configuration newConf, Configuration oldConf) {
Map<String, PropertyChange> changes = new HashMap<String, PropertyChange>();
// iterate over old configuration
for (Map.Entry<String, String> oldEntry: oldConf) {
String prop = oldEntry.getKey();
String oldVal = oldEntry.getValue();
String newVal = newConf.getRaw(prop);
if (newVal == null || !newVal.equals(oldVal)) {
changes.put(prop, new PropertyChange(prop, newVal, oldVal));
}
}
// now iterate over new configuration
// (to look for properties not present in old conf)
for (Map.Entry<String, String> newEntry: newConf) {
String prop = newEntry.getKey();
String newVal = newEntry.getValue();
if (oldConf.get(prop) == null) {
changes.put(prop, new PropertyChange(prop, newVal, null));
}
}
return changes.values();
}
public Collection<PropertyChange> parseChangedProperties(
Configuration newConf, Configuration oldConf) {
return getChangedProperties(newConf, oldConf);
}
}
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