hadoop RateLimiting 源码
haddop RateLimiting 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/RateLimiting.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.util;
import java.time.Duration;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
/**
* Minimal subset of google rate limiter class.
* Can be used to throttle use of object stores where excess load
* will trigger cluster-wide throttling, backoff etc. and so collapse
* performance.
* The time waited is returned as a Duration type.
* The google rate limiter implements this by allowing a caller to ask for
* more capacity than is available. This will be granted
* but the subsequent request will be blocked if the bucket of
* capacity hasn't let refilled to the point where there is
* capacity again.
*/
@InterfaceAudience.Private
@InterfaceStability.Unstable
public interface RateLimiting {
/**
* Acquire rate limiter capacity.
* If there is not enough space, the permits will be acquired,
* but the subsequent call will block until the capacity has been
* refilled.
* @param requestedCapacity capacity to acquire.
* @return time spent waiting for output.
*/
Duration acquire(int requestedCapacity);
}
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