org.apache.hadoop.fs.s3a.s3guard.MetadataStoreCapabilities Maven / Gradle / Ivy

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This module contains code to support integration with Amazon Web Services. It also declares the dependencies needed to work with AWS services.

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/**
 * 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.s3guard;

import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;

/**
 * All the capability constants used for the
 * {@link MetadataStore} implementations.
 */
@InterfaceAudience.Public
@InterfaceStability.Evolving
public final class MetadataStoreCapabilities {

  private MetadataStoreCapabilities(){
  }

  /**
   *  This capability tells if the metadata store supports authoritative
   *  directories. Used in {@link MetadataStore#getDiagnostics()} as a key
   *  for this capability. The value can be boolean true or false.
   *  If the Map.get() returns null for this key, that is interpreted as false.
   */
  public static final String PERSISTS_AUTHORITATIVE_BIT =
      "persist.authoritative.bit";
}