com.pingcap.tikv.allocator

类 RowIDAllocator

java.lang.Object

com.pingcap.tikv.allocator.RowIDAllocator

所有已实现的接口:

Serializable

public final class RowIDAllocator
extends Object
implements Serializable

RowIDAllocator read current start from TiKV and write back 'start+step' back to TiKV. It designs to allocate all id for data to be written at once, hence it does not need run inside a txn.

(start, end] is allocated

另请参阅:

序列化表格

方法概要

限定符和类型	方法和说明
static RowIDAllocator	create(long dbId, TiTableInfo table, TiConfiguration conf, boolean unsigned, long step)
static long	getAllocateId(long dbId, long tableId, Snapshot snapshot) read current row id from TiKV according to database id and table id.
long	getAutoIncId(long index)
long	getEnd()
long	getShardRowId(long index)
long	getStart()
static boolean	shardRowBitsOverflow(long base, long step, long shardRowBits, boolean reservedSignBit)
long	udpateAllocateId(long dbId, long tableId, long step, Snapshot snapshot, long shard, boolean hasSignedBit) read current row id from TiKV and write the calculated value back to TiKV.

从类继承的方法 java.lang.Object

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

方法详细资料

getAutoIncId

public long getAutoIncId(long index)

getShardRowId

public long getShardRowId(long index)

参数:

index - should >= 1

返回:

create

public static RowIDAllocator create(long dbId,
                                    TiTableInfo table,
                                    TiConfiguration conf,
                                    boolean unsigned,
                                    long step)

getStart

public long getStart()

getEnd

public long getEnd()

shardRowBitsOverflow

public static boolean shardRowBitsOverflow(long base,
                                           long step,
                                           long shardRowBits,
                                           boolean reservedSignBit)

udpateAllocateId

public long udpateAllocateId(long dbId,
                             long tableId,
                             long step,
                             Snapshot snapshot,
                             long shard,
                             boolean hasSignedBit)

read current row id from TiKV and write the calculated value back to TiKV. The calculation rule is start(read from TiKV) + step.

getAllocateId

public static long getAllocateId(long dbId,
                                 long tableId,
                                 Snapshot snapshot)

read current row id from TiKV according to database id and table id.