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
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.ipc	Tools to help define network clients and servers.
org.apache.hadoop.record	(DEPRECATED) Hadoop record I/O contains classes and a record description language translator for simplifying serialization and deserialization of records in a language-neutral manner.
org.apache.hadoop.record.meta
org.apache.hadoop.security
org.apache.hadoop.security.authorize
org.apache.hadoop.security.token
org.apache.hadoop.security.token.delegation
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 and Description
class	Configuration Provides access to configuration parameters.

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 and 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 and Description
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	org.apache.hadoop.fs.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 and Description
class	FsPermission A class for file/directory permissions.

Uses of Writable in org.apache.hadoop.io

Subinterfaces of Writable in org.apache.hadoop.io

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

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

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

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

Modifier and Type	Method and Description
Set<Map.Entry<WritableComparable,Writable>>	SortedMapWritable.entrySet()
Set<Map.Entry<Writable,Writable>>	MapWritable.entrySet()
Set<Map.Entry<Writable,Writable>>	MapWritable.entrySet()
SortedMap<WritableComparable,Writable>	SortedMapWritable.headMap(WritableComparable toKey)
Set<Writable>	MapWritable.keySet()
SortedMap<WritableComparable,Writable>	SortedMapWritable.subMap(WritableComparable fromKey, WritableComparable toKey)
SortedMap<WritableComparable,Writable>	SortedMapWritable.tailMap(WritableComparable fromKey)
Collection<Writable>	SortedMapWritable.values()
Collection<Writable>	MapWritable.values()

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

Modifier and Type	Method and Description
void	ArrayFile.Writer.append(Writable value) Append a value to the file.
void	MapFile.Writer.append(WritableComparable key, Writable val) Append a key/value pair to the map.
void	BloomMapFile.Writer.append(WritableComparable key, Writable val)
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	MapFile.Reader.get(WritableComparable key, Writable val) Return the value for the named key, or null if none exists.
Writable	BloomMapFile.Reader.get(WritableComparable key, Writable val) Fast version of the MapFile.Reader.get(WritableComparable, Writable) method.
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'.
boolean	SequenceFile.Reader.next(Writable key) Read the next key in the file into key, skipping its value.
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, Writable val) Read the next key/value pair in the file into key and val.
Writable	SortedMapWritable.put(WritableComparable key, Writable value)
Writable	MapWritable.put(Writable key, Writable value)
void	GenericWritable.set(Writable obj) Set the instance that is wrapped.
void	ArrayWritable.set(Writable[] values)
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 and Description
static long	MapFile.fix(FileSystem fs, Path dir, Class<? extends Writable> keyClass, Class<? extends Writable> valueClass, boolean dryrun, Configuration conf) This method attempts to fix a corrupt MapFile by re-creating its index.
static long	MapFile.fix(FileSystem fs, Path dir, Class<? extends Writable> keyClass, 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(Class<? extends Writable> c) Create a new instance of a class with a defined factory.
static Writable	WritableFactories.newInstance(Class<? extends Writable> c, Configuration conf) Create a new instance of a class with a defined factory.
void	MapWritable.putAll(Map<? extends Writable,? extends Writable> t)
void	MapWritable.putAll(Map<? extends Writable,? extends Writable> t)
void	SortedMapWritable.putAll(Map<? extends WritableComparable,? extends Writable> t)

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

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

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

Constructor and Description
ArrayFile.Writer(Configuration conf, FileSystem fs, String file, Class<? extends Writable> valClass) Create the named file for values of the named class.
ArrayFile.Writer(Configuration conf, FileSystem fs, String file, Class<? extends Writable> valClass, SequenceFile.CompressionType compress, Progressable progress) Create the named file for values of the named class.
ArrayWritable(Class<? extends Writable> valueClass)
ArrayWritable(Class<? extends Writable> valueClass, Writable[] values)
BloomMapFile.Writer(Configuration conf, FileSystem fs, String dirName, Class<? extends WritableComparable> keyClass, Class<? extends Writable> valClass, SequenceFile.CompressionType compress, CompressionCodec codec, Progressable progress) Deprecated.

Uses of Writable in org.apache.hadoop.ipc

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

Modifier and Type	Class and Description
class	ProtocolSignature
class	org.apache.hadoop.ipc.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 and Description
static <T extends Writable> AsyncGet<T,IOException>	Client.getAsyncRpcResponse()

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

Modifier and Type	Method and Description
abstract Writable	Server.call(RPC.RpcKind rpcKind, String protocol, Writable param, long receiveTime) Called for each call.
Writable	RPC.Server.call(RPC.RpcKind rpcKind, String protocol, Writable rpcRequest, long receiveTime)
Writable	Client.call(RPC.RpcKind rpcKind, Writable rpcRequest, org.apache.hadoop.ipc.Client.ConnectionId remoteId, AtomicBoolean fallbackToSimpleAuth) Make a call, passing rpcRequest, to the IPC server defined by remoteId, returning the rpc respond.
Writable	Server.call(Writable param, long receiveTime) Deprecated. Use Server.call(RPC.RpcKind, String, Writable, long) instead.

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

Modifier and Type	Method and Description
Class<? extends Writable>	Server.getRpcRequestWrapper(RpcHeaderProtos.RpcKindProto rpcKind)

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

Modifier and Type	Method and Description
abstract Writable	Server.call(RPC.RpcKind rpcKind, String protocol, Writable param, long receiveTime) Called for each call.
Writable	RPC.Server.call(RPC.RpcKind rpcKind, String protocol, Writable rpcRequest, long receiveTime)
Writable	Client.call(RPC.RpcKind rpcKind, Writable rpcRequest, org.apache.hadoop.ipc.Client.ConnectionId remoteId, AtomicBoolean fallbackToSimpleAuth) Make a call, passing rpcRequest, to the IPC server defined by remoteId, returning the rpc respond.
Writable	Server.call(Writable param, long receiveTime) Deprecated. Use Server.call(RPC.RpcKind, String, Writable, long) instead.

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

Modifier and Type	Method and Description
static void	Server.registerProtocolEngine(RPC.RpcKind rpcKind, 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 and Description
Client(Class<? extends Writable> valueClass, Configuration conf) Construct an IPC client with the default SocketFactory
Client(Class<? extends Writable> valueClass, Configuration conf, SocketFactory factory) Construct an IPC client whose values are of the given Writable class.
RPC.Server(String bindAddress, int port, Class<? extends Writable> paramClass, int handlerCount, int numReaders, int queueSizePerHandler, Configuration conf, String serverName, SecretManager<? extends TokenIdentifier> secretManager, String portRangeConfig)
Server(String bindAddress, int port, Class<? extends Writable> paramClass, int handlerCount, Configuration conf)
Server(String bindAddress, int port, Class<? extends Writable> rpcRequestClass, int handlerCount, int numReaders, int queueSizePerHandler, Configuration conf, String serverName, SecretManager<? extends TokenIdentifier> secretManager)
Server(String bindAddress, int port, Class<? extends Writable> rpcRequestClass, int handlerCount, int numReaders, int queueSizePerHandler, Configuration conf, String serverName, SecretManager<? extends TokenIdentifier> secretManager, String portRangeConfig) Constructs a server listening on the named port and address.

Uses of Writable in org.apache.hadoop.record

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

Modifier and Type	Class and Description
class	Record Deprecated. Replaced by Avro.

Uses of Writable in org.apache.hadoop.record.meta

Classes in org.apache.hadoop.record.meta that implement Writable

Modifier and Type	Class and Description
class	RecordTypeInfo Deprecated. Replaced by Avro.

Uses of Writable in org.apache.hadoop.security

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

Modifier and Type	Class and 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 and 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 and 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 and Description
class	AbstractDelegationTokenIdentifier

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 and Description
class	org.apache.hadoop.security.token.delegation.web.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 and 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 and 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	org.apache.hadoop.util.bloom.Filter Defines the general behavior of a filter.
class	RetouchedBloomFilter Implements a retouched Bloom filter, as defined in the CoNEXT 2006 paper.