hadoop ErrorTranslation 源码
haddop ErrorTranslation 代码
文件路径：/hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/impl/ErrorTranslation.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.impl;
import com.amazonaws.AmazonServiceException;
import static org.apache.hadoop.fs.s3a.impl.InternalConstants.SC_404;
/**
* Translate from AWS SDK-wrapped exceptions into IOExceptions with
* as much information as possible.
* The core of the translation logic is in S3AUtils, in
* {@code translateException} and nearby; that has grown to be
* a large a complex piece of logic, as it ties in with retry/recovery
* policies, throttling, etc.
*
* This class is where future expansion of that code should go so that we have
* an isolated place for all the changes..
* The existing code las been left in S3AUtils it is to avoid cherry-picking
* problems on backports.
*/
public class ErrorTranslation {
/**
* Private constructor for utility class.
*/
private ErrorTranslation() {
}
/**
* Does this exception indicate that the AWS Bucket was unknown.
* @param e exception.
* @return true if the status code and error code mean that the
* remote bucket is unknown.
*/
public static boolean isUnknownBucket(AmazonServiceException e) {
return e.getStatusCode() == SC_404
&& AwsErrorCodes.E_NO_SUCH_BUCKET.equals(e.getErrorCode());
}
/**
* Does this exception indicate that a reference to an object
* returned a 404. Unknown bucket errors do not match this
* predicate.
* @param e exception.
* @return true if the status code and error code mean that the
* HEAD request returned 404 but the bucket was there.
*/
public static boolean isObjectNotFound(AmazonServiceException e) {
return e.getStatusCode() == SC_404 && !isUnknownBucket(e);
}
/**
* AWS error codes explicitly recognized and processes specially;
* kept in their own class for isolation.
*/
public static final class AwsErrorCodes {
/**
* The AWS S3 error code used to recognize when a 404 means the bucket is
* unknown.
*/
public static final String E_NO_SUCH_BUCKET = "NoSuchBucket";
/** private constructor. */
private AwsErrorCodes() {
}
}
}
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