hadoop BlobMaterialization 源码
haddop BlobMaterialization 代码
文件路径：/hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azure/BlobMaterialization.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.azure;
import org.apache.hadoop.classification.InterfaceAudience;
/**
* Indicates whether there are actual blobs indicating the existence of
* directories or whether we're inferring their existence from them having files
* in there.
*/
@InterfaceAudience.Private
enum BlobMaterialization {
/**
* Indicates a directory that isn't backed by an actual blob, but its
* existence is implied by the fact that there are files in there. For
* example, if the blob /a/b exists then it implies the existence of the /a
* directory if there's no /a blob indicating it.
*/
Implicit,
/**
* Indicates that the directory is backed by an actual blob that has the
* isFolder metadata on it.
*/
Explicit,
}
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