Uses of Interface
com.aliyun.odps.io.Writable

Packages that use Writable

Package	Description
com.aliyun.odps.conf	Odps配置
com.aliyun.odps.counter	用于获取任务运行时统计数据的计数器
com.aliyun.odps.io	ODPS中使用的Writable数据类型，目前只有Graph作业需要使用
com.aliyun.odps.utils	Undocumented

Uses of Writable in com.aliyun.odps.conf

Classes in com.aliyun.odps.conf that implement Writable

Modifier and Type	Class and Description
class	Configuration 配置类，提供读取和设置配置参数的方法.

Uses of Writable in com.aliyun.odps.counter

Classes in com.aliyun.odps.counter that implement Writable

Modifier and Type	Class and Description
class	Counter Counter计数器，可以自定义Counter，用于统计计数，例如统计脏数据记录个数.
class	CounterGroup Counter 组，由多个 Counter 计数器组成.
class	Counters Counters 由多个 CounterGroup 组成，保存了所有的 Counter 的信息.

Uses of Writable in com.aliyun.odps.io

Subinterfaces of Writable in com.aliyun.odps.io

Modifier and Type	Interface and Description
interface	InputBlobWritable InputBlobWritable表示ODPS表或分区中列类型为blob的输入接口.
interface	OutputBlobWritable OutputBlobWritable表示ODPS表或分区中列类型为blob的输出接口, 该接口只能用于 com.aliyun.odps.mapreduce.Reducer向 com.aliyun.odps.Record 中写入blob类型的列.
interface	WritableComparable<T> WritableComparable 接口同时继承了 Writable 和 Comparable.

Classes in com.aliyun.odps.io that implement Writable

Modifier and Type	Class and Description
class	AbstractDatetimeWritable<T extends AbstractDatetimeWritable> AbstractDatetimeWritable 提供了 datetime 的 Writable 和 WritableComparable 的实现
class	AbstractMapWritable MapWritable 和 SortedMapWritable 的基类。 在一个map实例中，能够添加的Writable的类型最多是127。
class	ArrayWritable A Writable for arrays containing instances of a class.
class	BigDecimalWritable
class	BitMapWritable
class	BooleanWritable BooleanWritable 提供了 boolean 的 Writable 和 WritableComparable 的实现
class	BytesWritable BytesWritable 提供了 byte[] 的 Writable 和 WritableComparable 的实现.
class	ByteWritable ByteWritable 提供了 tinyint 的 Writable 和 WritableComparable 的实现
class	CharWritable CharWritable 提供了 char 的 Writable 和 WritableComparable 的实现
class	DatetimeWritable DatetimeWritable 提供了 datetime 的 Writable 和 WritableComparable 的实现
class	DateWritable DateWritable 提供了 date 的 Writable 和 WritableComparable 的实现。
class	DoubleWritable DoubleWritable 提供了 double 的 Writable 和 WritableComparable 的实现
class	FloatWritable FloatWritable 提供了 float 的 Writable 和 WritableComparable 的实现
class	IntervalDayTimeWritable IntervalDayTimeWritable 提供了 interval_day_time 的 Writable 和 WritableComparable 的实现
class	IntervalYearMonthWritable IntervalYearMonthWritable 提供了 interval_year_month 的 Writable 和 WritableComparable 的实现
class	IntWritable IntWritable 提供了 int 的 Writable 和 WritableComparable 的实现
class	LongWritable LongWritable 提供了 long 的 Writable 和 WritableComparable 的实现
class	MapWritable 可以用于序列化的Map，使用方法相同，可以在com.aliyun.odps.mapreduce.Mapper 中调用 com.aliyun.odps.mapreduce.MapContext#write(Object, Object)写出。
class	NullWritable NullWritable 提供了 null （空值）的 Writable 和 WritableComparable 的实现.
class	ShortWritable ShortWritable 提供了 smallint 的 Writable 和 WritableComparable 的实现
class	SortedMapWritable 可用于序列化的SortedMap。
class	StructWritable StructWritable 提供了 struct 类型数据 的 Writable 的实现
class	Text Text 提供了字符串的 Writable 和 WritableComparable 的实现.
class	TimestampWritable TimestampWritable 提供了 datetime 的 Writable 和 WritableComparable 的实现
class	Tuple Tuple 是 Writable 对象的有序集.
class	VarcharWritable VarcharWritable 提供了 varchar 的 Writable 和 WritableComparable 的实现

Methods in com.aliyun.odps.io with type parameters of type Writable

Modifier and Type	Method and Description
static <T extends Writable> T	WritableUtils.clone(T orig, Configuration conf) 通过Writable序列化方式拷贝一个Writable对象.

Methods in com.aliyun.odps.io that return Writable

Modifier and Type	Method and Description
Writable[]	ArrayWritable.get()
Writable	Tuple.get(int fieldNum) Get the value in a given field.
Writable	WritableRecord.get(int index) 获取某列取值，如果index>=列数，抛ArrayIndexOutOfBoundsException异常
Writable	SortedMapWritable.get(Object key)
Writable	MapWritable.get(Object key)
Writable	WritableRecord.get(String fieldName) 获取某列取值，如果列名不存在，抛IOException异常
Writable[]	WritableRecord.getAll() 获取所有列值，不包括分区列（Partition columns）
Writable	SortedMapWritable.put(WritableComparable key, Writable value)
Writable	MapWritable.put(Writable key, Writable value)
Writable	SortedMapWritable.remove(Object key)
Writable	MapWritable.remove(Object key)
Writable[]	Tuple.toArray() 得到Tuple的数组形式

Methods in com.aliyun.odps.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()
List<Writable>	StructWritable.get() 返回此 StructWritable 的值
List<Writable>	Tuple.getAll() Get all of the fields in the tuple as a list.
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 com.aliyun.odps.io with parameters of type Writable

Modifier and Type	Method and Description
void	Tuple.append(Writable val) Append a field to a tuple.
void	Tuple.append(Writable[] vals) 将数组中的field添加到Tuple
static int	TupleReaderWriter.compare(Writable o1, Writable o2) /** Compare two objects to each other.
static int	TupleReaderWriter.compare(Writable o1, Writable o2, byte dt1, byte dt2) Same as #compare(Object, Object), but does not use reflection to determine the type of passed in objects, relying instead on the caller to provide the appropriate values, as determined by findType(Object).
Writable	SortedMapWritable.put(WritableComparable key, Writable value)
Writable	MapWritable.put(Writable key, Writable value)
void	Tuple.set(int fieldNum, Writable val) Set the value in a given field.
void	WritableRecord.set(int index, Writable value) 设置列取值，如果index>=列数，抛ArrayIndexOutOfBoundsException异常
void	WritableRecord.set(String fieldName, Writable value) 设置列取值
void	ArrayWritable.set(Writable[] values)
void	Tuple.set(Writable[] vals) 设置Tuple中存放的Writable对象
void	WritableRecord.set(Writable[] values) 设置所有列的取值.
static byte[]	WritableUtils.toByteArray(Writable... writables) 将Writable对象转化成byte数组

Method parameters in com.aliyun.odps.io with type arguments of type Writable

Modifier and Type	Method and Description
void	Tuple.append(Collection<Writable> vals) 将集合中的field添加到Tuple
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)
void	Tuple.set(List<Writable> vals) 设置Tuple中存放的Writable对象，复用vals
void	StructWritable.set(List<Writable> values) 设置 StructWritable 的值

Constructors in com.aliyun.odps.io with parameters of type Writable

Constructor and Description
ArrayWritable(Class<? extends Writable> valueClass, Writable[] values)
Tuple(Writable[] fields) 给定 Writable 数组构造 Tuple.

Constructor parameters in com.aliyun.odps.io with type arguments of type Writable

Constructor and Description
ArrayWritable(Class<? extends Writable> valueClass)
ArrayWritable(Class<? extends Writable> valueClass, Writable[] values)
StructWritable(List<Writable> values) 构造 struct schema 值为给定 values 的 StructWritable.
Tuple(List<Writable> vals, boolean reference) 给定 List 构造 Tuple.

Uses of Writable in com.aliyun.odps.utils

Methods in com.aliyun.odps.utils with parameters of type Writable

Modifier and Type	Method and Description
static void	ReflectionUtils.cloneWritableInto(Writable dst, Writable src) Deprecated.
static String	CommonUtils.toDelimitedString(Writable[] fields, char delim, String nullIndicator)