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

Packages that use Writable
org.apache.hadoop.conf Configuration of system parameters. 
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.io.serializer This package provides a mechanism for using different serialization frameworks in Hadoop. 
org.apache.hadoop.mapred   
org.apache.hadoop.mapred.join   
org.apache.hadoop.mapred.lib.aggregate   
org.apache.hadoop.mapreduce   
org.apache.hadoop.mapreduce.counters This package contains the implementations of different types of map-reduce counters. 
org.apache.hadoop.mapreduce.lib.aggregate   
org.apache.hadoop.mapreduce.lib.input   
org.apache.hadoop.mapreduce.lib.join   
org.apache.hadoop.mapreduce.lib.output   
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.token   
org.apache.hadoop.security.token.delegation   
org.apache.hadoop.util Common utilities. 
org.apache.hadoop.util.bloom   
org.apache.hadoop.yarn.conf   
org.apache.hadoop.yarn.logaggregation   
org.apache.hadoop.yarn.security   
org.apache.hadoop.yarn.security.client   
 

Uses of Writable in org.apache.hadoop.conf
 

Classes in org.apache.hadoop.conf that implement Writable
 class Configuration
          Provides access to configuration parameters.
 

Uses of Writable in org.apache.hadoop.fs
 

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

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

Classes in org.apache.hadoop.fs.permission that implement Writable
 class FsPermission
          A class for file/directory permissions.
 

Uses of Writable in org.apache.hadoop.io
 

Subinterfaces of Writable in org.apache.hadoop.io
 interface WritableComparable<T>
          A Writable which is also Comparable.
 

Classes in org.apache.hadoop.io that implement Writable
 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.
 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
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
 Writable[] ArrayWritable.get()
           
 Writable GenericWritable.get()
          Return the wrapped instance.
 Writable[][] TwoDArrayWritable.get()
           
 Writable MapWritable.get(Object key)
           
 Writable SortedMapWritable.get(Object key)
           
 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 SortedMapWritable.put(WritableComparable key, Writable value)
           
 Writable MapWritable.put(Writable key, Writable value)
           
 Writable MapWritable.remove(Object key)
           
 Writable SortedMapWritable.remove(Object key)
           
 

Methods in org.apache.hadoop.io that return types with arguments of type Writable
 Set<Map.Entry<Writable,Writable>> MapWritable.entrySet()
           
 Set<Map.Entry<Writable,Writable>> MapWritable.entrySet()
           
 Set<Map.Entry<WritableComparable,Writable>> SortedMapWritable.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> MapWritable.values()
           
 Collection<Writable> SortedMapWritable.values()
           
 

Methods in org.apache.hadoop.io with parameters of type Writable
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 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
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
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
ArrayWritable(Class<? extends Writable> valueClass)
           
ArrayWritable(Class<? extends Writable> valueClass, Writable[] values)
           
 

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

Methods in org.apache.hadoop.io.serializer that return types with arguments of type Writable
 org.apache.hadoop.io.serializer.Deserializer<Writable> WritableSerialization.getDeserializer(Class<Writable> c)
           
 org.apache.hadoop.io.serializer.Serializer<Writable> WritableSerialization.getSerializer(Class<Writable> c)
           
 

Method parameters in org.apache.hadoop.io.serializer with type arguments of type Writable
 org.apache.hadoop.io.serializer.Deserializer<Writable> WritableSerialization.getDeserializer(Class<Writable> c)
           
 org.apache.hadoop.io.serializer.Serializer<Writable> WritableSerialization.getSerializer(Class<Writable> c)
           
 

Uses of Writable in org.apache.hadoop.mapred
 

Subinterfaces of Writable in org.apache.hadoop.mapred
 interface InputSplit
          InputSplit represents the data to be processed by an individual Mapper.
 

Classes in org.apache.hadoop.mapred that implement Writable
 class ClusterStatus
          Status information on the current state of the Map-Reduce cluster.
 class Counters
          A set of named counters.
static class Counters.Counter
          A counter record, comprising its name and value.
static class Counters.Group
          Group of counters, comprising of counters from a particular counter Enum class.
 class FileSplit
          A section of an input file.
 class JobConf
          A map/reduce job configuration.
 class JobQueueInfo
          Class that contains the information regarding the Job Queues which are maintained by the Hadoop Map/Reduce framework.
 class MultiFileSplit
          A sub-collection of input files.
 

Methods in org.apache.hadoop.mapred with type parameters of type Writable
static
<K extends WritableComparable,V extends Writable>
Writable
MapFileOutputFormat.getEntry(org.apache.hadoop.io.MapFile.Reader[] readers, Partitioner<K,V> partitioner, K key, V value)
          Get an entry from output generated by this class.
 

Methods in org.apache.hadoop.mapred that return Writable
static
<K extends WritableComparable,V extends Writable>
Writable
MapFileOutputFormat.getEntry(org.apache.hadoop.io.MapFile.Reader[] readers, Partitioner<K,V> partitioner, K key, V value)
          Get an entry from output generated by this class.
 

Methods in org.apache.hadoop.mapred that return types with arguments of type Writable
 RecordWriter<WritableComparable,Writable> MapFileOutputFormat.getRecordWriter(FileSystem ignored, JobConf job, String name, Progressable progress)
           
static Class<? extends Writable> SequenceFileAsBinaryOutputFormat.getSequenceFileOutputValueClass(JobConf conf)
          Get the value class for the SequenceFile
 

Uses of Writable in org.apache.hadoop.mapred.join
 

Classes in org.apache.hadoop.mapred.join with type parameters of type Writable
 class ArrayListBackedIterator<X extends Writable>
          This class provides an implementation of ResetableIterator.
 interface ComposableInputFormat<K extends WritableComparable,V extends Writable>
          Refinement of InputFormat requiring implementors to provide ComposableRecordReader instead of RecordReader.
 interface ComposableRecordReader<K extends WritableComparable,V extends Writable>
          Additional operations required of a RecordReader to participate in a join.
 class CompositeRecordReader<K extends WritableComparable,V extends Writable,X extends Writable>
          A RecordReader that can effect joins of RecordReaders sharing a common key type and partitioning.
 class CompositeRecordReader<K extends WritableComparable,V extends Writable,X extends Writable>
          A RecordReader that can effect joins of RecordReaders sharing a common key type and partitioning.
 class MultiFilterRecordReader<K extends WritableComparable,V extends Writable>
          Base class for Composite join returning values derived from multiple sources, but generally not tuples.
 class OverrideRecordReader<K extends WritableComparable,V extends Writable>
          Prefer the "rightmost" data source for this key.
 interface ResetableIterator<T extends Writable>
          This defines an interface to a stateful Iterator that can replay elements added to it directly.
 class StreamBackedIterator<X extends Writable>
          This class provides an implementation of ResetableIterator.
 class WrappedRecordReader<K extends WritableComparable,U extends Writable>
          Proxy class for a RecordReader participating in the join framework.
 

Classes in org.apache.hadoop.mapred.join that implement Writable
 class CompositeInputSplit
          This InputSplit contains a set of child InputSplits.
 

Constructors in org.apache.hadoop.mapred.join with parameters of type Writable
TupleWritable(Writable[] vals)
          Initialize tuple with storage; unknown whether any of them contain "written" values.
 

Uses of Writable in org.apache.hadoop.mapred.lib.aggregate
 

Classes in org.apache.hadoop.mapred.lib.aggregate with type parameters of type Writable
 class ValueAggregatorCombiner<K1 extends WritableComparable,V1 extends Writable>
          This class implements the generic combiner of Aggregate.
 class ValueAggregatorJobBase<K1 extends WritableComparable,V1 extends Writable>
          This abstract class implements some common functionalities of the the generic mapper, reducer and combiner classes of Aggregate.
 class ValueAggregatorMapper<K1 extends WritableComparable,V1 extends Writable>
          This class implements the generic mapper of Aggregate.
 class ValueAggregatorReducer<K1 extends WritableComparable,V1 extends Writable>
          This class implements the generic reducer of Aggregate.
 

Uses of Writable in org.apache.hadoop.mapreduce
 

Subinterfaces of Writable in org.apache.hadoop.mapreduce
 interface Counter
          A named counter that tracks the progress of a map/reduce job.
 interface CounterGroup
          A group of Counters that logically belong together.
 

Classes in org.apache.hadoop.mapreduce that implement Writable
 class ClusterMetrics
          Status information on the current state of the Map-Reduce cluster.
 class ID
          A general identifier, which internally stores the id as an integer.
 class JobID
          JobID represents the immutable and unique identifier for the job.
 class JobStatus
          Describes the current status of a job.
 class QueueAclsInfo
          Class to encapsulate Queue ACLs for a particular user.
 class QueueInfo
          Class that contains the information regarding the Job Queues which are maintained by the Hadoop Map/Reduce framework.
 class TaskAttemptID
          TaskAttemptID represents the immutable and unique identifier for a task attempt.
 class TaskCompletionEvent
          This is used to track task completion events on job tracker.
 class TaskID
          TaskID represents the immutable and unique identifier for a Map or Reduce Task.
 class org.apache.hadoop.mapreduce.TaskReport
          A report on the state of a task.
 class TaskTrackerInfo
          Information about TaskTracker.
 

Uses of Writable in org.apache.hadoop.mapreduce.counters
 

Subinterfaces of Writable in org.apache.hadoop.mapreduce.counters
 interface CounterGroupBase<T extends Counter>
          The common counter group interface.
 

Classes in org.apache.hadoop.mapreduce.counters that implement Writable
 class AbstractCounters<C extends Counter,G extends CounterGroupBase<C>>
          An abstract class to provide common implementation for the Counters container in both mapred and mapreduce packages.
 

Uses of Writable in org.apache.hadoop.mapreduce.lib.aggregate
 

Classes in org.apache.hadoop.mapreduce.lib.aggregate with type parameters of type Writable
 class ValueAggregatorCombiner<K1 extends WritableComparable<?>,V1 extends Writable>
          This class implements the generic combiner of Aggregate.
 class ValueAggregatorJobBase<K1 extends WritableComparable<?>,V1 extends Writable>
          This abstract class implements some common functionalities of the the generic mapper, reducer and combiner classes of Aggregate.
 class ValueAggregatorMapper<K1 extends WritableComparable<?>,V1 extends Writable>
          This class implements the generic mapper of Aggregate.
 class ValueAggregatorReducer<K1 extends WritableComparable<?>,V1 extends Writable>
          This class implements the generic reducer of Aggregate.
 

Uses of Writable in org.apache.hadoop.mapreduce.lib.input
 

Classes in org.apache.hadoop.mapreduce.lib.input that implement Writable
 class CombineFileSplit
          A sub-collection of input files.
 

Uses of Writable in org.apache.hadoop.mapreduce.lib.join
 

Classes in org.apache.hadoop.mapreduce.lib.join with type parameters of type Writable
 class ArrayListBackedIterator<X extends Writable>
          This class provides an implementation of ResetableIterator.
 class ComposableInputFormat<K extends WritableComparable<?>,V extends Writable>
          Refinement of InputFormat requiring implementors to provide ComposableRecordReader instead of RecordReader.
 class ComposableRecordReader<K extends WritableComparable<?>,V extends Writable>
          Additional operations required of a RecordReader to participate in a join.
 class CompositeRecordReader<K extends WritableComparable<?>,V extends Writable,X extends Writable>
          A RecordReader that can effect joins of RecordReaders sharing a common key type and partitioning.
 class CompositeRecordReader<K extends WritableComparable<?>,V extends Writable,X extends Writable>
          A RecordReader that can effect joins of RecordReaders sharing a common key type and partitioning.
 class MultiFilterRecordReader<K extends WritableComparable<?>,V extends Writable>
          Base class for Composite join returning values derived from multiple sources, but generally not tuples.
 class OverrideRecordReader<K extends WritableComparable<?>,V extends Writable>
          Prefer the "rightmost" data source for this key.
 interface ResetableIterator<T extends Writable>
          This defines an interface to a stateful Iterator that can replay elements added to it directly.
 class StreamBackedIterator<X extends Writable>
          This class provides an implementation of ResetableIterator.
 class WrappedRecordReader<K extends WritableComparable<?>,U extends Writable>
          Proxy class for a RecordReader participating in the join framework.
 

Classes in org.apache.hadoop.mapreduce.lib.join that implement Writable
 class TupleWritable
          Writable type storing multiple Writables.
 

Fields in org.apache.hadoop.mapreduce.lib.join declared as Writable
protected  X CompositeRecordReader.value
           
 

Methods in org.apache.hadoop.mapreduce.lib.join that return Writable
 Writable TupleWritable.get(int i)
          Get ith Writable from Tuple.
 

Methods in org.apache.hadoop.mapreduce.lib.join that return types with arguments of type Writable
 Iterator<Writable> TupleWritable.iterator()
          Return an iterator over the elements in this tuple.
 

Constructors in org.apache.hadoop.mapreduce.lib.join with parameters of type Writable
TupleWritable(Writable[] vals)
          Initialize tuple with storage; unknown whether any of them contain "written" values.
 

Uses of Writable in org.apache.hadoop.mapreduce.lib.output
 

Methods in org.apache.hadoop.mapreduce.lib.output with type parameters of type Writable
static
<K extends WritableComparable<?>,V extends Writable>
Writable
MapFileOutputFormat.getEntry(org.apache.hadoop.io.MapFile.Reader[] readers, Partitioner<K,V> partitioner, K key, V value)
          Get an entry from output generated by this class.
 

Methods in org.apache.hadoop.mapreduce.lib.output that return Writable
static
<K extends WritableComparable<?>,V extends Writable>
Writable
MapFileOutputFormat.getEntry(org.apache.hadoop.io.MapFile.Reader[] readers, Partitioner<K,V> partitioner, K key, V value)
          Get an entry from output generated by this class.
 

Methods in org.apache.hadoop.mapreduce.lib.output that return types with arguments of type Writable
 RecordWriter<WritableComparable<?>,Writable> MapFileOutputFormat.getRecordWriter(TaskAttemptContext context)
           
static Class<? extends Writable> SequenceFileAsBinaryOutputFormat.getSequenceFileOutputValueClass(JobContext job)
          Get the value class for the SequenceFile
 

Uses of Writable in org.apache.hadoop.record
 

Classes in org.apache.hadoop.record that implement Writable
 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
 class RecordTypeInfo
          Deprecated. Replaced by Avro.
 

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

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

Uses of Writable in org.apache.hadoop.util
 

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

Uses of Writable in org.apache.hadoop.yarn.conf
 

Classes in org.apache.hadoop.yarn.conf that implement Writable
 class YarnConfiguration
           
 

Uses of Writable in org.apache.hadoop.yarn.logaggregation
 

Classes in org.apache.hadoop.yarn.logaggregation that implement Writable
static class AggregatedLogFormat.LogKey
           
 

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

Classes in org.apache.hadoop.yarn.security that implement Writable
 class AMRMTokenIdentifier
          AMRMTokenIdentifier is the TokenIdentifier to be used by ApplicationMasters to authenticate to the ResourceManager.
 class ContainerTokenIdentifier
          TokenIdentifier for a container.
 class NMTokenIdentifier
           
 

Uses of Writable in org.apache.hadoop.yarn.security.client
 

Classes in org.apache.hadoop.yarn.security.client that implement Writable
 class ClientToAMTokenIdentifier
           
 class RMDelegationTokenIdentifier
          Delegation Token Identifier that identifies the delegation tokens from the Resource Manager.
 



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