hadoop FailureInjectionPolicy 源码
haddop FailureInjectionPolicy 代码
文件路径：/hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/FailureInjectionPolicy.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.fs.s3a;
import org.apache.hadoop.util.Preconditions;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.hadoop.conf.Configuration;
import static org.apache.hadoop.fs.s3a.Constants.*;
/**
* Simple object which stores current failure injection settings.
*/
public class FailureInjectionPolicy {
/**
* Keys containing this substring will be subject to delayed visibility.
*/
public static final String DEFAULT_DELAY_KEY_SUBSTRING = "DELAY_LISTING_ME";
private static final Logger LOG =
LoggerFactory.getLogger(InconsistentAmazonS3Client.class);
/**
* Probability of throttling a request.
*/
private float throttleProbability;
/**
* limit for failures before operations succeed; if 0 then "no limit".
*/
private int failureLimit = 0;
public FailureInjectionPolicy(Configuration conf) {
this.setThrottleProbability(conf.getFloat(FAIL_INJECT_THROTTLE_PROBABILITY,
0.0f));
}
public float getThrottleProbability() {
return throttleProbability;
}
public int getFailureLimit() {
return failureLimit;
}
public void setFailureLimit(int failureLimit) {
this.failureLimit = failureLimit;
}
/**
* Set the probability of throttling a request.
* @param throttleProbability the probability of a request being throttled.
*/
public void setThrottleProbability(float throttleProbability) {
this.throttleProbability = validProbability(throttleProbability);
}
public static boolean trueWithProbability(float p) {
return Math.random() < p;
}
@Override
public String toString() {
return String.format("FailureInjectionPolicy:" +
" throttle probability %s" + "; failure limit %d",
throttleProbability, failureLimit);
}
/**
* Validate a probability option.
* @param p probability
* @return the probability, if valid
* @throws IllegalArgumentException if the probability is out of range.
*/
private static float validProbability(float p) {
Preconditions.checkArgument(p >= 0.0f && p <= 1.0f,
"Probability out of range 0 to 1 %s", p);
return p;
}
}
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