hadoop Quota 源码
haddop Quota 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/Quota.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.namenode;
import org.apache.hadoop.hdfs.util.EnumCounters;
/** Quota types. */
public enum Quota {
/** The namespace usage, i.e. the number of name objects. */
NAMESPACE,
/** The storage space usage in bytes including replication. */
STORAGESPACE;
/** Counters for quota counts. */
public static class Counts extends EnumCounters<Quota> {
/** @return a new counter with the given namespace and storagespace usages. */
public static Counts newInstance(long namespace, long storagespace) {
final Counts c = new Counts();
c.set(NAMESPACE, namespace);
c.set(STORAGESPACE, storagespace);
return c;
}
public static Counts newInstance() {
return newInstance(0, 0);
}
Counts() {
super(Quota.class);
}
}
/**
* Is quota violated?
* The quota is violated if quota is set and usage > quota.
*/
public static boolean isViolated(final long quota, final long usage) {
return quota >= 0 && usage > quota;
}
/**
* Is quota violated?
* The quota is violated if quota is set, delta > 0 and
* usage + delta > quota.
*/
static boolean isViolated(final long quota, final long usage,
final long delta) {
return quota >= 0 && delta > 0 && usage > quota - delta;
}
}
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