org.apache.flink.table.runtime.util

类 ResettableExternalBuffer

java.lang.Object

org.apache.flink.table.runtime.util.ResettableExternalBuffer

所有已实现的接口:

Closeable, AutoCloseable, ResettableRowBuffer

public class ResettableExternalBuffer
extends Object
implements ResettableRowBuffer

A resettable external buffer for binary row. It stores records in memory and spill to disk when memory is not enough. When the spill is completed, the records are written to memory again. The returned iterator reads the data in write order (read spilled records first). It supports infinite length. It can open multiple Iterators. It support new iterator with beginRow.

NOTE: Not supports reading while writing. In the face of concurrent modification, the iterator fails quickly and cleanly, rather than risking arbitrary, non-deterministic behavior at an undetermined time in the future.

嵌套类概要

嵌套类

限定符和类型	类和说明
class	ResettableExternalBuffer.BufferIterator Iterator of external buffer.

从接口继承的嵌套类/接口 org.apache.flink.table.runtime.util.ResettableRowBuffer

ResettableRowBuffer.ResettableIterator

字段概要

字段

限定符和类型	字段和说明
static int	MIN_NUM_MEMORY The minimum number of segments that are required, 320 KibiBytes.

构造器概要

构造器

构造器和说明
ResettableExternalBuffer(org.apache.flink.runtime.io.disk.iomanager.IOManager ioManager, LazyMemorySegmentPool pool, AbstractRowDataSerializer serializer, boolean isRowAllInFixedPart)

方法概要

限定符和类型	方法和说明
void	add(org.apache.flink.table.data.RowData row) Appends the specified row to the end of this buffer.
void	close() Delete all files and release the memory.
void	complete() Finally, complete add.
int	getNumSpillFiles()
long	getSpillInBytes()
long	getUsedMemoryInBytes()
ResettableExternalBuffer.BufferIterator	newIterator() Get a new iterator starting from first row.
ResettableExternalBuffer.BufferIterator	newIterator(int beginRow) Get a new iterator starting from the `beginRow`-th row.
void	reset() Re-initialize the buffer state.
int	size()

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

字段详细资料

MIN_NUM_MEMORY

public static final int MIN_NUM_MEMORY

The minimum number of segments that are required, 320 KibiBytes.

另请参阅:

常量字段值

构造器详细资料

ResettableExternalBuffer

public ResettableExternalBuffer(org.apache.flink.runtime.io.disk.iomanager.IOManager ioManager,
                                LazyMemorySegmentPool pool,
                                AbstractRowDataSerializer serializer,
                                boolean isRowAllInFixedPart)

方法详细资料

reset

public void reset()

从接口复制的说明: ResettableRowBuffer

Re-initialize the buffer state.

指定者:

reset 在接口中 ResettableRowBuffer

add

public void add(org.apache.flink.table.data.RowData row)
         throws IOException

从接口复制的说明: ResettableRowBuffer

Appends the specified row to the end of this buffer.

指定者:

add 在接口中 ResettableRowBuffer

抛出:

IOException

complete

public void complete()

从接口复制的说明: ResettableRowBuffer

Finally, complete add.

指定者:

complete 在接口中 ResettableRowBuffer

newIterator

public ResettableExternalBuffer.BufferIterator newIterator()

从接口复制的说明: ResettableRowBuffer

Get a new iterator starting from first row.

指定者:

newIterator 在接口中 ResettableRowBuffer

newIterator

public ResettableExternalBuffer.BufferIterator newIterator(int beginRow)

从接口复制的说明: ResettableRowBuffer

Get a new iterator starting from the `beginRow`-th row. `beginRow` is 0-indexed.

指定者:

newIterator 在接口中 ResettableRowBuffer

close

public void close()

Delete all files and release the memory.

指定者:

close 在接口中 Closeable

指定者:

close 在接口中 AutoCloseable

size

public int size()

getUsedMemoryInBytes

public long getUsedMemoryInBytes()

getNumSpillFiles

public int getNumSpillFiles()

getSpillInBytes

public long getSpillInBytes()