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## 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.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` | `BlockLocation`
`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[][]` | `TwoDArrayWritable.get()`
`Writable` | `GenericWritable.get()` Return the wrapped instance.
`Writable[]` | `ArrayWritable.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 `Counter`s 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 `Writable`s.

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.security.client

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

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