org.apache.flink.connector.file.src.util

类 RecordAndPosition<E>

java.lang.Object

org.apache.flink.connector.file.src.util.RecordAndPosition<E>

直接已知子类:

MutableRecordAndPosition

@PublicEvolving
public class RecordAndPosition<E>
extends Object

A record, together with the reader position to be stored in the checkpoint.

The position defines the point in the reader AFTER the record. Record processing and updating checkpointed state happens atomically. The position points to where the reader should resume after this record is processed.

For example, the very first record in a file split could have an offset of zero and a recordSkipCount of one.

This class is immutable for safety. Use MutableRecordAndPosition if you need a mutable version for efficiency.

Note on this design: Why do we not make the position point to the current record and always skip one record after recovery (the just processed record)? We need to be able to support formats where skipping records (even one) is not an option. For example formats that execute (pushed down) filters may want to avoid a skip-record-count all together, so that they don't skip the wrong records when the filter gets updated around a checkpoint/savepoint.

字段概要

字段

限定符和类型	字段和说明
static long	NO_OFFSET Constant for the offset, reflecting that the position does not contain any offset information.

构造器概要

构造器

构造器和说明
RecordAndPosition(E record, long offset, long recordSkipCount) Creates a new RecordAndPosition with the given record and position info.

方法概要

限定符和类型	方法和说明
long	getOffset()
E	getRecord()
long	getRecordSkipCount()
String	toString()

从类继承的方法 java.lang.Object

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

字段详细资料

NO_OFFSET

public static final long NO_OFFSET

Constant for the offset, reflecting that the position does not contain any offset information. It is used in positions that are defined only by a number of records to skip.

另请参阅:

常量字段值

构造器详细资料

RecordAndPosition

public RecordAndPosition(E record,
                         long offset,
                         long recordSkipCount)

Creates a new RecordAndPosition with the given record and position info.

方法详细资料

getRecord

public E getRecord()

getOffset

public long getOffset()

getRecordSkipCount

public long getRecordSkipCount()

toString

public String toString()

覆盖:

toString 在类中 Object