hadoop CommonPathCapabilities 源码

haddop CommonPathCapabilities 代码

文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/CommonPathCapabilities.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;

import org.apache.hadoop.classification.InterfaceStability;

/**
 * Common path capabilities.
 */
public final class CommonPathCapabilities {

  private CommonPathCapabilities() {
  }

  /**
   * Does the store support
   * {@code FileSystem.setAcl(Path, List)},
   * {@code FileSystem.getAclStatus(Path)}
   * and related methods?
   * Value: {@value}.
   */
  public static final String FS_ACLS = "fs.capability.paths.acls";

  /**
   * Does the store support {@code FileSystem.append(Path)}?
   * Value: {@value}.
   */
  public static final String FS_APPEND = "fs.capability.paths.append";

  /**
   * Does the store support {@code FileSystem.getFileChecksum(Path)}?
   * Value: {@value}.
   */
  public static final String FS_CHECKSUMS = "fs.capability.paths.checksums";

  /**
   * Does the store support {@code FileSystem.concat(Path, Path[])}?
   * Value: {@value}.
   */
  public static final String FS_CONCAT = "fs.capability.paths.concat";

  /**
   * Does the store support {@code FileSystem.listCorruptFileBlocks(Path)} ()}?
   * Value: {@value}.
   */
  public static final String FS_LIST_CORRUPT_FILE_BLOCKS =
      "fs.capability.paths.list-corrupt-file-blocks";

  /**
   * Does the store support
   * {@code FileSystem.createPathHandle(FileStatus, Options.HandleOpt...)}
   * and related methods?
   * Value: {@value}.
   */
  public static final String FS_PATHHANDLES = "fs.capability.paths.pathhandles";

  /**
   * Does the store support {@code FileSystem.setPermission(Path, FsPermission)}
   * and related methods?
   * Value: {@value}.
   */
  public static final String FS_PERMISSIONS = "fs.capability.paths.permissions";

  /**
   * Does this filesystem connector only support filesystem read operations?
   * For example, the {@code HttpFileSystem} is always read-only.
   * This is different from "is the specific instance and path read only?",
   * which must be determined by checking permissions (where supported), or
   * attempting write operations under a path.
   * Value: {@value}.
   */
  public static final String FS_READ_ONLY_CONNECTOR =
      "fs.capability.paths.read-only-connector";

  /**
   * Does the store support snapshots through
   * {@code FileSystem.createSnapshot(Path)} and related methods??
   * Value: {@value}.
   */
  public static final String FS_SNAPSHOTS = "fs.capability.paths.snapshots";

  /**
   * Does the store support {@code FileSystem.setStoragePolicy(Path, String)}
   * and related methods?
   * Value: {@value}.
   */
  public static final String FS_STORAGEPOLICY =
      "fs.capability.paths.storagepolicy";

  /**
   * Does the store support symlinks through
   * {@code FileSystem.createSymlink(Path, Path, boolean)} and related methods?
   * Value: {@value}.
   */
  public static final String FS_SYMLINKS =
      "fs.capability.paths.symlinks";

  /**
   * Does the store support {@code FileSystem#truncate(Path, long)} ?
   * Value: {@value}.
   */
  public static final String FS_TRUNCATE =
      "fs.capability.paths.truncate";

  /**
   * Does the store support XAttributes through
   * {@code FileSystem#.setXAttr()} and related methods?
   * Value: {@value}.
   */
  public static final String FS_XATTRS = "fs.capability.paths.xattrs";

  /**
   * Probe for support for {@link BatchListingOperations}.
   */
  @InterfaceStability.Unstable
  public static final String FS_EXPERIMENTAL_BATCH_LISTING =
      "fs.capability.batch.listing";

  /**
   * Does the store support multipart uploading?
   * Value: {@value}.
   */
  public static final String FS_MULTIPART_UPLOADER =
      "fs.capability.multipart.uploader";


  /**
   * Stream abort() capability implemented by {@link Abortable#abort()}.
   * Value: {@value}.
   */
  public static final String ABORTABLE_STREAM =
      "fs.capability.outputstream.abortable";

  /**
   * Does this FS support etags?
   * That is: will FileStatus entries from listing/getFileStatus
   * probes support EtagSource and return real values.
   */
  public static final String ETAGS_AVAILABLE =
      "fs.capability.etags.available";

  /**
   * Are etags guaranteed to be preserved across rename() operations..
   * FileSystems MUST NOT declare support for this feature
   * unless this holds.
   */
  public static final String ETAGS_PRESERVED_IN_RENAME =
      "fs.capability.etags.preserved.in.rename";


}

相关信息

hadoop 源码目录

相关文章

hadoop Abortable 源码

hadoop AbstractFileSystem 源码

hadoop AvroFSInput 源码

hadoop BBPartHandle 源码

hadoop BBUploadHandle 源码

hadoop BatchListingOperations 源码

hadoop BatchedRemoteIterator 源码

hadoop BlockLocation 源码

hadoop BlockStoragePolicySpi 源码

hadoop BufferedFSInputStream 源码