Uses of Interface
org.apache.hadoop.io.Writable

Packages that use Writable

Package	Description
org.apache.hadoop.conf	Configuration of system parameters.
org.apache.hadoop.crypto.key.kms
org.apache.hadoop.fs	An abstract file system API.
org.apache.hadoop.fs.permission	This package provides support for HDFS permission and ACL.
org.apache.hadoop.fs.store	This package is for classes to be shared across object stores; for internal use within the hadoop-* modules only.
org.apache.hadoop.io	Generic i/o code for use when reading and writing data to the network, to databases, and to files.
org.apache.hadoop.io.serializer	This package provides a mechanism for using different serialization frameworks in Hadoop.
org.apache.hadoop.ipc	Tools to help define network clients and servers.
org.apache.hadoop.security
org.apache.hadoop.security.authorize	Support for service-level authorization.
org.apache.hadoop.security.token	Support for delegation tokens.
org.apache.hadoop.security.token.delegation	ZooKeeper secret manager for TokenIdentifiers and DelegationKeys.
org.apache.hadoop.security.token.delegation.web
org.apache.hadoop.util	Common utilities.
org.apache.hadoop.util.bloom

Uses of Writable in org.apache.hadoop.conf

Classes in org.apache.hadoop.conf that implement Writable

Modifier and Type	Class	Description
class	Configuration	Provides access to configuration parameters.
class	ConfigurationWithLogging	Logs access to Configuration.

Uses of Writable in org.apache.hadoop.crypto.key.kms

Classes in org.apache.hadoop.crypto.key.kms that implement Writable

Modifier and Type	Class	Description
static class	KMSDelegationToken.KMSDelegationTokenIdentifier	DelegationTokenIdentifier used for the KMS.

Uses of Writable in org.apache.hadoop.fs

Classes in org.apache.hadoop.fs that implement Writable

Modifier and Type	Class	Description
class	CompositeCrcFileChecksum	Composite CRC.
class	ContentSummary	Store the summary of a content (a directory or a file).
class	FileChecksum	An abstract class representing file checksums for files.
class	FileStatus	Interface that represents the client side information for a file.
class	FsServerDefaults	Provides server default configuration values to clients.
class	FsStatus	This class is used to represent the capacity, free and used space on a FileSystem.
class	LocatedFileStatus	This class defines a FileStatus that includes a file's block locations.
class	MD5MD5CRC32CastagnoliFileChecksum	For CRC32 with the Castagnoli polynomial
class	MD5MD5CRC32FileChecksum	MD5 of MD5 of CRC32.
class	MD5MD5CRC32GzipFileChecksum	For CRC32 with the Gzip polynomial

Uses of Writable in org.apache.hadoop.fs.permission

Classes in org.apache.hadoop.fs.permission that implement Writable

Modifier and Type	Class	Description
class	FsCreateModes	A class that stores both masked and unmasked create modes and is a drop-in replacement for masked permission.
class	FsPermission	A class for file/directory permissions.
class	PermissionStatus	Store permission related information.

Uses of Writable in org.apache.hadoop.fs.store

Classes in org.apache.hadoop.fs.store that implement Writable

Modifier and Type	Class	Description
class	EtagChecksum	An etag as a checksum.

Uses of Writable in org.apache.hadoop.io

Subinterfaces of Writable in org.apache.hadoop.io

Modifier and Type	Interface	Description
interface	WritableComparable<T>	A Writable which is also Comparable.

Classes in org.apache.hadoop.io that implement Writable

Modifier and Type	Class	Description
class	AbstractMapWritable	Abstract base class for MapWritable and SortedMapWritable Unlike org.apache.nutch.crawl.MapWritable, this class allows creation of MapWritable<Writable, MapWritable> so the CLASS_TO_ID and ID_TO_CLASS maps travel with the class instead of being static.
class	ArrayPrimitiveWritable	This is a wrapper class.
class	ArrayWritable	A Writable for arrays containing instances of a class.
class	BooleanWritable	A WritableComparable for booleans.
class	BytesWritable	A byte sequence that is usable as a key or value.
class	ByteWritable	A WritableComparable for a single byte.
class	CompressedWritable	A base-class for Writables which store themselves compressed and lazily inflate on field access.
class	DoubleWritable	Writable for Double values.
class	EnumSetWritable<E extends java.lang.Enum<E>>	A Writable wrapper for EnumSet.
class	FloatWritable	A WritableComparable for floats.
class	GenericWritable	A wrapper for Writable instances.
class	IntWritable	A WritableComparable for ints.
class	LongWritable	A WritableComparable for longs.
class	MapWritable	A Writable Map.
class	MD5Hash	A Writable for MD5 hash values.
class	NullWritable	Singleton Writable with no data.
class	ObjectWritable	A polymorphic Writable that writes an instance with it's class name.
static class	SequenceFile.Metadata	The class encapsulating with the metadata of a file.
class	ShortWritable	A WritableComparable for shorts.
class	SortedMapWritable<K extends WritableComparable<? super K>>	A Writable SortedMap.
class	Text	This class stores text using standard UTF8 encoding.
class	TwoDArrayWritable	A Writable for 2D arrays containing a matrix of instances of a class.
class	UTF8	Deprecated. replaced by Text
class	VersionedWritable	A base class for Writables that provides version checking.
class	VIntWritable	A WritableComparable for integer values stored in variable-length format.
class	VLongWritable	A WritableComparable for longs in a variable-length format.

Methods in org.apache.hadoop.io with type parameters of type Writable

Modifier and Type	Method	Description
static <T extends Writable> T	WritableUtils.clone(T orig, Configuration conf)	Make a copy of a writable object using serialization to a buffer.

Methods in org.apache.hadoop.io that return Writable

Modifier and Type	Method	Description
Writable	ArrayFile.Reader.get(long n, Writable value)	Return the nth value in the file.
Writable[]	ArrayWritable.get()
Writable	BloomMapFile.Reader.get(WritableComparable key, Writable val)	Fast version of the MapFile.Reader.get(WritableComparable, Writable) method.
Writable	GenericWritable.get()	Return the wrapped instance.
Writable	MapFile.Reader.get(WritableComparable key, Writable val)	Return the value for the named key, or null if none exists.
Writable	MapWritable.get(java.lang.Object key)
Writable	SortedMapWritable.get(java.lang.Object key)
Writable[][]	TwoDArrayWritable.get()
static Writable	WritableFactories.newInstance(java.lang.Class<? extends Writable> c)	Create a new instance of a class with a defined factory.
static Writable	WritableFactories.newInstance(java.lang.Class<? extends Writable> c, Configuration conf)	Create a new instance of a class with a defined factory.
Writable	WritableFactory.newInstance()
Writable	ArrayFile.Reader.next(Writable value)	Read and return the next value in the file.
Writable	MapWritable.put(Writable key, Writable value)
Writable	SortedMapWritable.put(K key, Writable value)
Writable	MapWritable.remove(java.lang.Object key)
Writable	SortedMapWritable.remove(java.lang.Object key)

Methods in org.apache.hadoop.io that return types with arguments of type Writable

Modifier and Type	Method	Description
java.util.Set<java.util.Map.Entry<Writable,Writable>>	MapWritable.entrySet()
java.util.Set<java.util.Map.Entry<Writable,Writable>>	MapWritable.entrySet()
java.util.Set<java.util.Map.Entry<K,Writable>>	SortedMapWritable.entrySet()
protected abstract java.lang.Class<? extends Writable>[]	GenericWritable.getTypes()	Return all classes that may be wrapped.
java.lang.Class<? extends Writable>	ArrayWritable.getValueClass()
java.util.SortedMap<K,Writable>	SortedMapWritable.headMap(K toKey)
java.util.Set<Writable>	MapWritable.keySet()
java.util.SortedMap<K,Writable>	SortedMapWritable.subMap(K fromKey, K toKey)
java.util.SortedMap<K,Writable>	SortedMapWritable.tailMap(K fromKey)
java.util.Collection<Writable>	MapWritable.values()
java.util.Collection<Writable>	SortedMapWritable.values()

Methods in org.apache.hadoop.io with parameters of type Writable

Modifier and Type	Method	Description
void	ArrayFile.Writer.append(Writable value)	Append a value to the file.
void	BloomMapFile.Writer.append(WritableComparable key, Writable val)
void	MapFile.Writer.append(WritableComparable key, Writable val)	Append a key/value pair to the map.
void	SequenceFile.Writer.append(Writable key, Writable val)	Append a key/value pair.
static void	WritableUtils.cloneInto(Writable dst, Writable src)	Deprecated. use ReflectionUtils.cloneInto instead.
protected void	AbstractMapWritable.copy(Writable other)	Used by child copy constructors.
Writable	ArrayFile.Reader.get(long n, Writable value)	Return the nth value in the file.
Writable	BloomMapFile.Reader.get(WritableComparable key, Writable val)	Fast version of the MapFile.Reader.get(WritableComparable, Writable) method.
Writable	MapFile.Reader.get(WritableComparable key, Writable val)	Return the value for the named key, or null if none exists.
WritableComparable	MapFile.Reader.getClosest(WritableComparable key, Writable val)	Finds the record that is the closest match to the specified key.
WritableComparable	MapFile.Reader.getClosest(WritableComparable key, Writable val, boolean before)	Finds the record that is the closest match to the specified key.
void	SequenceFile.Reader.getCurrentValue(Writable val)	Get the 'value' corresponding to the last read 'key'.
Writable	ArrayFile.Reader.next(Writable value)	Read and return the next value in the file.
boolean	MapFile.Reader.next(WritableComparable key, Writable val)	Read the next key/value pair in the map into key and val.
boolean	SequenceFile.Reader.next(Writable key)
boolean	SequenceFile.Reader.next(Writable key, Writable val)	Read the next key/value pair in the file into key and val.
Writable	MapWritable.put(Writable key, Writable value)
Writable	SortedMapWritable.put(K key, Writable value)
void	ArrayWritable.set(Writable[] values)
void	GenericWritable.set(Writable obj)	Set the instance that is wrapped.
void	TwoDArrayWritable.set(Writable[][] values)
static byte[]	WritableUtils.toByteArray(Writable... writables)	Convert writables to a byte array.

Method parameters in org.apache.hadoop.io with type arguments of type Writable

Modifier and Type	Method	Description
static long	MapFile.fix(FileSystem fs, Path dir, java.lang.Class<? extends Writable> keyClass, java.lang.Class<? extends Writable> valueClass, boolean dryrun, Configuration conf)	This method attempts to fix a corrupt MapFile by re-creating its index.
static Writable	WritableFactories.newInstance(java.lang.Class<? extends Writable> c)	Create a new instance of a class with a defined factory.
static Writable	WritableFactories.newInstance(java.lang.Class<? extends Writable> c, Configuration conf)	Create a new instance of a class with a defined factory.
void	MapWritable.putAll(java.util.Map<? extends Writable,? extends Writable> t)
void	MapWritable.putAll(java.util.Map<? extends Writable,? extends Writable> t)
void	SortedMapWritable.putAll(java.util.Map<? extends K,? extends Writable> t)

Constructors in org.apache.hadoop.io with parameters of type Writable

Constructor	Description
ArrayWritable(java.lang.Class<? extends Writable> valueClass, Writable[] values)
TwoDArrayWritable(java.lang.Class valueClass, Writable[][] values)

Constructor parameters in org.apache.hadoop.io with type arguments of type Writable

Constructor	Description
ArrayWritable(java.lang.Class<? extends Writable> valueClass)
ArrayWritable(java.lang.Class<? extends Writable> valueClass, Writable[] values)
Writer(Configuration conf, FileSystem fs, java.lang.String file, java.lang.Class<? extends Writable> valClass)	Create the named file for values of the named class.
Writer(Configuration conf, FileSystem fs, java.lang.String file, java.lang.Class<? extends Writable> valClass, SequenceFile.CompressionType compress, Progressable progress)	Create the named file for values of the named class.

Uses of Writable in org.apache.hadoop.io.serializer

Methods in org.apache.hadoop.io.serializer that return types with arguments of type Writable

Modifier and Type	Method	Description
Deserializer<Writable>	WritableSerialization.getDeserializer(java.lang.Class<Writable> c)
Serializer<Writable>	WritableSerialization.getSerializer(java.lang.Class<Writable> c)

Method parameters in org.apache.hadoop.io.serializer with type arguments of type Writable

Modifier and Type	Method	Description
Deserializer<Writable>	WritableSerialization.getDeserializer(java.lang.Class<Writable> c)
Serializer<Writable>	WritableSerialization.getSerializer(java.lang.Class<Writable> c)

Uses of Writable in org.apache.hadoop.ipc

Classes in org.apache.hadoop.ipc that implement Writable

Modifier and Type	Class	Description
class	ProtobufWrapperLegacy	A RpcWritable wrapper for unshaded protobuf messages.
class	ProtocolSignature
class	RpcWritable
static class	RpcWritable.Buffer	adapter to allow decoding of writables and protobufs from a byte buffer.

Methods in org.apache.hadoop.ipc with type parameters of type Writable

Modifier and Type	Method	Description
static <T extends Writable> AsyncGet<T,java.io.IOException>	Client.getAsyncRpcResponse()

Methods in org.apache.hadoop.ipc that return Writable

Modifier and Type	Method	Description
Writable	Client.call(RPC.RpcKind rpcKind, Writable rpcRequest, Client.ConnectionId remoteId, java.util.concurrent.atomic.AtomicBoolean fallbackToSimpleAuth)	Make a call, passing rpcRequest, to the IPC server defined by remoteId, returning the rpc respond.
Writable	Client.call(RPC.RpcKind rpcKind, Writable rpcRequest, Client.ConnectionId remoteId, java.util.concurrent.atomic.AtomicBoolean fallbackToSimpleAuth, AlignmentContext alignmentContext)
Writable	RPC.Server.call(RPC.RpcKind rpcKind, java.lang.String protocol, Writable rpcRequest, long receiveTime)
Writable	Server.call(Writable param, long receiveTime)	Deprecated. Use Server.call(RPC.RpcKind, String, Writable, long) instead
abstract Writable	Server.call(RPC.RpcKind rpcKind, java.lang.String protocol, Writable param, long receiveTime)	Called for each call.
protected Writable	ProtobufRpcEngine.Invoker.constructRpcRequest(java.lang.reflect.Method method, com.google.protobuf.Message theRequest)
protected Writable	ProtobufRpcEngine2.Invoker.constructRpcRequest(java.lang.reflect.Method method, org.apache.hadoop.thirdparty.protobuf.Message theRequest)

Methods in org.apache.hadoop.ipc that return types with arguments of type Writable

Modifier and Type	Method	Description
java.lang.Class<? extends Writable>	Server.getRpcRequestWrapper(org.apache.hadoop.ipc.protobuf.RpcHeaderProtos.RpcKindProto rpcKind)

Methods in org.apache.hadoop.ipc with parameters of type Writable

Modifier and Type	Method	Description
Writable	Client.call(RPC.RpcKind rpcKind, Writable rpcRequest, Client.ConnectionId remoteId, java.util.concurrent.atomic.AtomicBoolean fallbackToSimpleAuth)	Make a call, passing rpcRequest, to the IPC server defined by remoteId, returning the rpc respond.
Writable	Client.call(RPC.RpcKind rpcKind, Writable rpcRequest, Client.ConnectionId remoteId, java.util.concurrent.atomic.AtomicBoolean fallbackToSimpleAuth, AlignmentContext alignmentContext)
Writable	RPC.Server.call(RPC.RpcKind rpcKind, java.lang.String protocol, Writable rpcRequest, long receiveTime)
Writable	Server.call(Writable param, long receiveTime)	Deprecated. Use Server.call(RPC.RpcKind, String, Writable, long) instead
abstract Writable	Server.call(RPC.RpcKind rpcKind, java.lang.String protocol, Writable param, long receiveTime)	Called for each call.
void	Server.Call.setDeferredResponse(Writable response)

Method parameters in org.apache.hadoop.ipc with type arguments of type Writable

Modifier and Type	Method	Description
Client	ClientCache.getClient(Configuration conf, javax.net.SocketFactory factory, java.lang.Class<? extends Writable> valueClass)	Construct & cache an IPC client with the user-provided SocketFactory if no cached client exists.
static void	Server.registerProtocolEngine(RPC.RpcKind rpcKind, java.lang.Class<? extends Writable> rpcRequestWrapperClass, org.apache.hadoop.ipc.RPC.RpcInvoker rpcInvoker)	Register a RPC kind and the class to deserialize the rpc request.

Constructor parameters in org.apache.hadoop.ipc with type arguments of type Writable

Constructor	Description
Client(java.lang.Class<? extends Writable> valueClass, Configuration conf)	Construct an IPC client with the default SocketFactory.
Client(java.lang.Class<? extends Writable> valueClass, Configuration conf, javax.net.SocketFactory factory)	Construct an IPC client whose values are of the given Writable class.
Server(java.lang.String bindAddress, int port, java.lang.Class<? extends Writable> paramClass, int handlerCount, int numReaders, int queueSizePerHandler, Configuration conf, java.lang.String serverName, SecretManager<? extends TokenIdentifier> secretManager, java.lang.String portRangeConfig)
Server(java.lang.String bindAddress, int port, java.lang.Class<? extends Writable> rpcRequestClass, int handlerCount, int numReaders, int queueSizePerHandler, Configuration conf, java.lang.String serverName, SecretManager<? extends TokenIdentifier> secretManager)
Server(java.lang.String bindAddress, int port, java.lang.Class<? extends Writable> rpcRequestClass, int handlerCount, int numReaders, int queueSizePerHandler, Configuration conf, java.lang.String serverName, SecretManager<? extends TokenIdentifier> secretManager, java.lang.String portRangeConfig)	Constructs a server listening on the named port and address.
Server(java.lang.String bindAddress, int port, java.lang.Class<? extends Writable> paramClass, int handlerCount, Configuration conf)

Uses of Writable in org.apache.hadoop.security

Classes in org.apache.hadoop.security that implement Writable

Modifier and Type	Class	Description
class	Credentials	A class that provides the facilities of reading and writing secret keys and Tokens.

Uses of Writable in org.apache.hadoop.security.authorize

Classes in org.apache.hadoop.security.authorize that implement Writable

Modifier and Type	Class	Description
class	AccessControlList	Class representing a configured access control list.

Uses of Writable in org.apache.hadoop.security.token

Classes in org.apache.hadoop.security.token that implement Writable

Modifier and Type	Class	Description
class	Token<T extends TokenIdentifier>	The client-side form of the token.
class	TokenIdentifier	An identifier that identifies a token, may contain public information about a token, including its kind (or type).

Uses of Writable in org.apache.hadoop.security.token.delegation

Classes in org.apache.hadoop.security.token.delegation that implement Writable

Modifier and Type	Class	Description
class	AbstractDelegationTokenIdentifier
static class	AbstractDelegationTokenSecretManager.DelegationTokenInformation	Class to encapsulate a token's renew date and password.
class	DelegationKey	Key used for generating and verifying delegation tokens

Uses of Writable in org.apache.hadoop.security.token.delegation.web

Classes in org.apache.hadoop.security.token.delegation.web that implement Writable

Modifier and Type	Class	Description
class	DelegationTokenIdentifier	Concrete delegation token identifier used by DelegationTokenManager, KerberosDelegationTokenAuthenticationHandler and DelegationTokenAuthenticationFilter.

Uses of Writable in org.apache.hadoop.util

Methods in org.apache.hadoop.util with parameters of type Writable

Modifier and Type	Method	Description
static void	ReflectionUtils.cloneWritableInto(Writable dst, Writable src)	Deprecated.

Uses of Writable in org.apache.hadoop.util.bloom

Classes in org.apache.hadoop.util.bloom that implement Writable

Modifier and Type	Class	Description
class	BloomFilter	Implements a Bloom filter, as defined by Bloom in 1970.
class	CountingBloomFilter	Implements a counting Bloom filter, as defined by Fan et al.
class	DynamicBloomFilter	Implements a dynamic Bloom filter, as defined in the INFOCOM 2006 paper.
class	Filter	Defines the general behavior of a filter.
class	Key	The general behavior of a key that must be stored in a filter.
class	RetouchedBloomFilter	Implements a retouched Bloom filter, as defined in the CoNEXT 2006 paper.