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Packages that use Writable | |
org.apache.hadoop.dfs | A distributed implementation of FileSystem . |
org.apache.hadoop.examples | Hadoop example code. |
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.mapred | A system for scalable, fault-tolerant, distributed computation over large data collections. |
org.apache.hadoop.mapred.lib | Library of generally useful mappers, reducers, and partitioners. |
org.apache.hadoop.util | Common utilities. |
Uses of Writable in org.apache.hadoop.dfs |
Classes in org.apache.hadoop.dfs that implement Writable | |
class |
DatanodeInfo
DatanodeInfo tracks stats on a given DataNode, such as available storage capacity, last update time, etc. |
Uses of Writable in org.apache.hadoop.examples |
Methods in org.apache.hadoop.examples with parameters of type Writable | |
void |
RandomWriter.Map.map(WritableComparable key,
Writable value,
OutputCollector output,
Reporter reporter)
Given an output filename, write a bunch of random records to it. |
void |
WordCount.MapClass.map(WritableComparable key,
Writable value,
OutputCollector output,
Reporter reporter)
|
Uses of Writable in org.apache.hadoop.io |
Subinterfaces of Writable in org.apache.hadoop.io | |
interface |
WritableComparable
An interface which extends both Writable and Comparable . |
Classes in org.apache.hadoop.io that implement Writable | |
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 |
CompressedWritable
A base-class for Writables which store themselves compressed and lazily inflate on field access. |
class |
FloatWritable
A WritableComparable for floats. |
class |
IntWritable
A WritableComparable for ints. |
class |
LongWritable
A WritableComparable for longs. |
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 |
TwoDArrayWritable
A Writable for 2D arrays containing a matrix of instances of a class. |
class |
UTF8
A WritableComparable for strings that uses the UTF8 encoding. |
class |
VersionedWritable
A base class for Writables that provides version checking. |
Methods in org.apache.hadoop.io that return Writable | |
static Writable |
WritableUtils.clone(Writable orig,
JobConf conf)
Make a copy of a writable object using serialization to a buffer. |
Writable |
WritableFactory.newInstance()
Return a new instance. |
static Writable |
WritableFactories.newInstance(Class c)
Create a new instance of a class with a defined factory. |
Writable[][] |
TwoDArrayWritable.get()
|
Writable[] |
ArrayWritable.get()
|
Writable |
MapFile.Reader.get(WritableComparable key,
Writable val)
Return the value for the named key, or null if none exists. |
Writable |
ArrayFile.Reader.next(Writable value)
Read and return the next value in the file. |
Writable |
ArrayFile.Reader.get(long n,
Writable value)
Return the n th value in the file. |
Methods in org.apache.hadoop.io with parameters of type Writable | |
static Writable |
WritableUtils.clone(Writable orig,
JobConf conf)
Make a copy of a writable object using serialization to a buffer. |
void |
TwoDArrayWritable.set(Writable[][] values)
|
void |
ArrayWritable.set(Writable[] values)
|
void |
SequenceFile.Writer.append(Writable key,
Writable val)
Append a key/value pair. |
boolean |
SequenceFile.Reader.next(Writable key)
Read the next key in the file into key , skipping its
value. |
boolean |
SequenceFile.Reader.next(Writable key,
Writable val)
Read the next key/value pair in the file into key and
val . |
void |
MapFile.Writer.append(WritableComparable key,
Writable val)
Append a key/value pair to the map. |
boolean |
MapFile.Reader.next(WritableComparable key,
Writable val)
Read the next key/value pair in the map into key and
val . |
Writable |
MapFile.Reader.get(WritableComparable key,
Writable val)
Return the value for the named key, or null if none exists. |
void |
ArrayFile.Writer.append(Writable value)
Append a value to the file. |
Writable |
ArrayFile.Reader.next(Writable value)
Read and return the next value in the file. |
Writable |
ArrayFile.Reader.get(long n,
Writable value)
Return the n th value in the file. |
Constructors in org.apache.hadoop.io with parameters of type Writable | |
TwoDArrayWritable(Class valueClass,
Writable[][] values)
|
|
ArrayWritable(Class valueClass,
Writable[] values)
|
Uses of Writable in org.apache.hadoop.ipc |
Methods in org.apache.hadoop.ipc that return Writable | |
Writable |
RPC.Server.call(Writable param)
|
Writable |
Client.call(Writable param,
InetSocketAddress address)
Make a call, passing param , to the IPC server running at
address , returning the value. |
Writable[] |
Client.call(Writable[] params,
InetSocketAddress[] addresses)
Makes a set of calls in parallel. |
abstract Writable |
Server.call(Writable param)
Called for each call. |
Methods in org.apache.hadoop.ipc with parameters of type Writable | |
Writable |
RPC.Server.call(Writable param)
|
Writable |
Client.call(Writable param,
InetSocketAddress address)
Make a call, passing param , to the IPC server running at
address , returning the value. |
Writable[] |
Client.call(Writable[] params,
InetSocketAddress[] addresses)
Makes a set of calls in parallel. |
abstract Writable |
Server.call(Writable param)
Called for each call. |
Uses of Writable in org.apache.hadoop.mapred |
Classes in org.apache.hadoop.mapred that implement Writable | |
class |
ClusterStatus
Summarizes the size and current state of the cluster. |
class |
FileSplit
A section of an input file. |
class |
TaskReport
A report on the state of a task. |
Methods in org.apache.hadoop.mapred that return Writable | |
static Writable |
MapFileOutputFormat.getEntry(MapFile.Reader[] readers,
Partitioner partitioner,
WritableComparable key,
Writable value)
Get an entry from output generated by this class. |
Methods in org.apache.hadoop.mapred with parameters of type Writable | |
boolean |
SequenceFileRecordReader.next(Writable key,
Writable value)
|
void |
Mapper.map(WritableComparable key,
Writable value,
OutputCollector output,
Reporter reporter)
Maps a single input key/value pair into intermediate key/value pairs. |
int |
Partitioner.getPartition(WritableComparable key,
Writable value,
int numPartitions)
Returns the paritition number for a given entry given the total number of partitions. |
static Writable |
MapFileOutputFormat.getEntry(MapFile.Reader[] readers,
Partitioner partitioner,
WritableComparable key,
Writable value)
Get an entry from output generated by this class. |
void |
OutputCollector.collect(WritableComparable key,
Writable value)
Adds a key/value pair to the output. |
void |
RecordWriter.write(WritableComparable key,
Writable value)
Writes a key/value pair. |
boolean |
RecordReader.next(Writable key,
Writable value)
Reads the next key/value pair. |
Uses of Writable in org.apache.hadoop.mapred.lib |
Methods in org.apache.hadoop.mapred.lib with parameters of type Writable | |
void |
TokenCountMapper.map(WritableComparable key,
Writable value,
OutputCollector output,
Reporter reporter)
|
void |
RegexMapper.map(WritableComparable key,
Writable value,
OutputCollector output,
Reporter reporter)
|
void |
InverseMapper.map(WritableComparable key,
Writable value,
OutputCollector output,
Reporter reporter)
The inverse function. |
void |
IdentityMapper.map(WritableComparable key,
Writable val,
OutputCollector output,
Reporter reporter)
The identify function. |
int |
HashPartitioner.getPartition(WritableComparable key,
Writable value,
int numReduceTasks)
Use Object.hashCode() to partition. |
Uses of Writable in org.apache.hadoop.util |
Methods in org.apache.hadoop.util with parameters of type Writable | |
void |
CopyFiles.CopyFilesMapper.map(WritableComparable key,
Writable val,
OutputCollector out,
Reporter reporter)
Map method. |
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