Package org.apache.hadoop.hdfs.util

package org.apache.hadoop.hdfs.util
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.
  • Class
    Description
    org.apache.hadoop.hdfs.util.AsyncRFAAppender
    Until we migrate to log4j2, use this appender for namenode audit logger as well as datanode and namenode metric loggers with log4j properties, if async logging is required with RFA.
    org.apache.hadoop.hdfs.util.AtomicFileOutputStream
    A FileOutputStream that has the property that it will only show up at its destination once it has been entirely written and flushed to disk.
    org.apache.hadoop.hdfs.util.BestEffortLongFile
    Class that represents a file on disk which stores a single long value, but does not make any effort to make it truly durable.
    org.apache.hadoop.hdfs.util.ByteArray
    Wrapper for byte[] to use byte[] as key in HashMap
    org.apache.hadoop.hdfs.util.ByteArrayManager
    Manage byte array creation and release.
    org.apache.hadoop.hdfs.util.ByteArrayManager.Conf
    Configuration for ByteArrayManager.
    org.apache.hadoop.hdfs.util.ByteBufferOutputStream
    OutputStream that writes into a ByteBuffer.
    org.apache.hadoop.hdfs.util.Canceler
    Provides a simple interface where one thread can mark an operation for cancellation, and another thread can poll for whether the cancellation has occurred.
    org.apache.hadoop.hdfs.util.CombinedHostsFileReader
    Reader support for JSON-based datanode configuration, an alternative format to the exclude/include files configuration.
    org.apache.hadoop.hdfs.util.CombinedHostsFileWriter
    Writer support for JSON-based datanode configuration, an alternative format to the exclude/include files configuration.
    org.apache.hadoop.hdfs.util.ConstEnumCounters<E extends Enum<E>>
    Const Counters for an enum type.
    org.apache.hadoop.hdfs.util.ConstEnumCounters.ConstEnumException
    An exception class for modification on ConstEnumCounters.
    org.apache.hadoop.hdfs.util.CyclicIteration<K,V>
    Provide an cyclic Iterator for a NavigableMap.
    org.apache.hadoop.hdfs.util.DataTransferThrottler
    a class to throttle the data transfers.
    org.apache.hadoop.hdfs.util.Diff<K,E extends org.apache.hadoop.hdfs.util.Diff.Element<K>>
    The difference between the current state and a previous state of a list.
    org.apache.hadoop.hdfs.util.Diff.Container<E>
    Containing exactly one element.
    org.apache.hadoop.hdfs.util.Diff.Element<K>
    An interface for the elements in a Diff.
    org.apache.hadoop.hdfs.util.Diff.Processor<E>
    An interface for passing a method in order to process elements.
    org.apache.hadoop.hdfs.util.Diff.UndoInfo<E>
    Undo information for some operations such as delete(E) and Diff.modify(Element, Element).
    org.apache.hadoop.hdfs.util.ECPolicyLoader
    A EC policy loading tool that loads user defined EC policies from XML file.
    org.apache.hadoop.hdfs.util.EnumCounters<E extends Enum<E>>
    Counters for an enum type.
    org.apache.hadoop.hdfs.util.EnumDoubles<E extends Enum<E>>
    Similar to EnumCounters except that the value type is double.
    org.apache.hadoop.hdfs.util.Holder<T>
    A Holder is simply a wrapper around some other object.
    org.apache.hadoop.hdfs.util.IOUtilsClient
     
    org.apache.hadoop.hdfs.util.LightWeightHashSet<T>
    A low memory linked hash set implementation, which uses an array for storing the elements and linked lists for collision resolution.
    org.apache.hadoop.hdfs.util.LightWeightLinkedSet<T>
    A low memory linked hash set implementation, which uses an array for storing the elements and linked lists for collision resolution.
    org.apache.hadoop.hdfs.util.LongBitFormat
    Bit format in a long.
    org.apache.hadoop.hdfs.util.LongBitFormat.Enum
     
    org.apache.hadoop.hdfs.util.MD5FileUtils
    Static functions for dealing with files of the same format that the Unix "md5sum" utility writes.
    org.apache.hadoop.hdfs.util.PersistentLongFile
    Class that represents a file on disk which persistently stores a single long value.
    org.apache.hadoop.hdfs.util.ReadOnlyList<E>
    A ReadOnlyList is a unmodifiable list, which supports read-only operations.
    org.apache.hadoop.hdfs.util.ReadOnlyList.Util
    Utilities for ReadOnlyList
    org.apache.hadoop.hdfs.util.ReferenceCountMap<E extends org.apache.hadoop.hdfs.util.ReferenceCountMap.ReferenceCounter>
    Class for de-duplication of instances.
    org.apache.hadoop.hdfs.util.ReferenceCountMap.ReferenceCounter
    Interface for the reference count holder
    org.apache.hadoop.hdfs.util.RwLock
    Read-write lock interface for FSNamesystem.
    RwLockMode
    This lock mode is used for FGL.
    org.apache.hadoop.hdfs.util.StripedBlockUtil
    When accessing a file in striped layout, operations on logical byte ranges in the file need to be mapped to physical byte ranges on block files stored on DataNodes.
    org.apache.hadoop.hdfs.util.StripedBlockUtil.AlignedStripe
    Given a requested byte range on a striped block group, an AlignedStripe represents an inclusive StripedBlockUtil.VerticalRange that is aligned with both the byte range and boundaries of all internal blocks.
    org.apache.hadoop.hdfs.util.StripedBlockUtil.BlockReadStats
    Struct holding the read statistics.
    org.apache.hadoop.hdfs.util.StripedBlockUtil.ChunkByteBuffer
    A utility to manage ByteBuffer slices for a reader.
    org.apache.hadoop.hdfs.util.StripedBlockUtil.StripeRange
    Used to indicate the buffered data's range in the block group.
    org.apache.hadoop.hdfs.util.StripedBlockUtil.StripingCell
    Cell is the unit of encoding used in DFSStripedOutputStream.
    org.apache.hadoop.hdfs.util.StripedBlockUtil.StripingChunk
    Indicates the coverage of an StripedBlockUtil.AlignedStripe on an internal block, and the state of the chunk in the context of the read request.
    org.apache.hadoop.hdfs.util.StripedBlockUtil.StripingChunkReadResult
    This class represents result from a striped read request.
    org.apache.hadoop.hdfs.util.StripedBlockUtil.VerticalRange
    A simple utility class representing an arbitrary vertical inclusive range starting at StripedBlockUtil.VerticalRange.offsetInBlock and lasting for StripedBlockUtil.VerticalRange.spanInBlock bytes in an internal block.
    org.apache.hadoop.hdfs.util.XMLUtils
    General xml utilities.
    org.apache.hadoop.hdfs.util.XMLUtils.InvalidXmlException
    Exception that reflects an invalid XML document.
    org.apache.hadoop.hdfs.util.XMLUtils.Stanza
    Represents a bag of key-value pairs encountered during parsing an XML file.
    org.apache.hadoop.hdfs.util.XMLUtils.UnmanglingError
    Exception that reflects a string that cannot be unmangled.