org.apache.hadoop.hbase.client

类 ReversedClientScanner

java.lang.Object

org.apache.hadoop.hbase.client.AbstractClientScanner

org.apache.hadoop.hbase.client.ClientScanner

org.apache.hadoop.hbase.client.ReversedClientScanner

所有已实现的接口:

Closeable, AutoCloseable, Iterable<Result>, ResultScanner

@InterfaceAudience.Private
public class ReversedClientScanner
extends ClientScanner

A reversed client scanner which support backward scanning

字段概要

从类继承的字段 org.apache.hadoop.hbase.client.ClientScanner

cache, caching, callable, caller, closed, conf, currentRegion, lastNext, lastResult, maxScannerResultSize, pool, primaryOperationTimeout, rpcControllerFactory, scan, scanMetricsPublished, scannerTimeout

从类继承的字段 org.apache.hadoop.hbase.client.AbstractClientScanner

scanMetrics

构造器概要

构造器

构造器和说明
ReversedClientScanner(org.apache.hadoop.conf.Configuration conf, Scan scan, TableName tableName, ClusterConnection connection, RpcRetryingCallerFactory rpcFactory, RpcControllerFactory controllerFactory, ExecutorService pool, int primaryOperationTimeout) Create a new ReversibleClientScanner for the specified table Note that the passed Scan's start row maybe changed.

方法概要

方法

限定符和类型	方法和说明
protected ReversedScannerCallable	createScannerCallable() Will be called in moveToNextRegion to create ScannerCallable.
protected boolean	setNewStartKey() Will be called in moveToNextRegion when currentRegion is null.

从类继承的方法 org.apache.hadoop.hbase.client.ClientScanner

close, getCacheSize, getCaching, getConf, getConnection, getMaxResultSize, getPool, getPrimaryOperationTimeout, getRetries, getScan, getScannerTimeout, getTable, getTableName, getTimestamp, loadCache, moveToNextRegion, next, renewLease, writeScanMetrics

从类继承的方法 org.apache.hadoop.hbase.client.AbstractClientScanner

getScanMetrics, initScanMetrics, iterator, next

从类继承的方法 java.lang.Object

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

构造器详细资料

ReversedClientScanner

public ReversedClientScanner(org.apache.hadoop.conf.Configuration conf,
                     Scan scan,
                     TableName tableName,
                     ClusterConnection connection,
                     RpcRetryingCallerFactory rpcFactory,
                     RpcControllerFactory controllerFactory,
                     ExecutorService pool,
                     int primaryOperationTimeout)
                      throws IOException

Create a new ReversibleClientScanner for the specified table Note that the passed Scan's start row maybe changed.

参数:

conf -

scan -

tableName -

connection -

pool -

primaryOperationTimeout -

抛出:

IOException

方法详细资料

setNewStartKey

protected boolean setNewStartKey()

从类复制的说明: ClientScanner

Will be called in moveToNextRegion when currentRegion is null. Abstract because for normal scan, we will start next scan from the endKey of the currentRegion, and for reversed scan, we will start next scan from the startKey of the currentRegion.

指定者:

setNewStartKey 在类中 ClientScanner

返回:

false if we have reached the stop row. Otherwise true.

createScannerCallable

protected ReversedScannerCallable createScannerCallable()

从类复制的说明: ClientScanner

Will be called in moveToNextRegion to create ScannerCallable. Abstract because for reversed scan we need to create a ReversedScannerCallable.

指定者:

createScannerCallable 在类中 ClientScanner