org.apache.hadoop.hbase.client

Class ClientSimpleScanner

java.lang.Object

org.apache.hadoop.hbase.client.AbstractClientScanner

org.apache.hadoop.hbase.client.ClientScanner

org.apache.hadoop.hbase.client.ClientSimpleScanner

All Implemented Interfaces:

Closeable, AutoCloseable, Iterable<Result>, ResultScanner

Direct Known Subclasses:

ClientAsyncPrefetchScanner

@InterfaceAudience.Private
public class ClientSimpleScanner
extends ClientScanner

ClientSimpleScanner implements a sync scanner behaviour. The cache is a simple list. The prefetch is invoked only when the application finished processing the entire cache.

Field Summary

Fields inherited from class org.apache.hadoop.hbase.client.ClientScanner

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

Fields inherited from class org.apache.hadoop.hbase.client.AbstractClientScanner

scanMetrics

Constructor Summary

Constructors

Constructor and Description

ClientSimpleScanner(org.apache.hadoop.conf.Configuration configuration, Scan scan, Scan scanForMetrics, TableName name, ClusterConnection connection, RpcRetryingCallerFactory rpcCallerFactory, RpcControllerFactory rpcControllerFactory, ExecutorService pool, int scanReadRpcTimeout, int scannerTimeout, int replicaCallTimeoutMicroSecondScan, ConnectionConfiguration connectionConfiguration, Map<String,byte[]> requestAttributes)

Method Summary

Modifier and Type	Method and Description
protected ScannerCallable	createScannerCallable() Will be called in moveToNextRegion to create ScannerCallable.
protected boolean	setNewStartKey() Will be called in moveToNextRegion when currentRegion is null.

Methods inherited from class org.apache.hadoop.hbase.client.ClientScanner

addEstimatedSize, close, getCacheCount, getCacheSize, getCaching, getConf, getConnection, getMaxResultSize, getPool, getPrimaryOperationTimeout, getRetries, getScan, getScannerTimeout, getScanReplicaId, getTable, getTimestamp, initCache, initSyncCache, loadCache, moveToNextRegion, next, nextWithSyncCache, renewLease, writeScanMetrics

Methods inherited from class org.apache.hadoop.hbase.client.AbstractClientScanner

getScanMetrics, initScanMetrics

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.hadoop.hbase.client.ResultScanner

iterator, next

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Constructor Detail

ClientSimpleScanner

public ClientSimpleScanner(org.apache.hadoop.conf.Configuration configuration,
                           Scan scan,
                           Scan scanForMetrics,
                           TableName name,
                           ClusterConnection connection,
                           RpcRetryingCallerFactory rpcCallerFactory,
                           RpcControllerFactory rpcControllerFactory,
                           ExecutorService pool,
                           int scanReadRpcTimeout,
                           int scannerTimeout,
                           int replicaCallTimeoutMicroSecondScan,
                           ConnectionConfiguration connectionConfiguration,
                           Map<String,byte[]> requestAttributes)
                    throws IOException

Throws:

IOException

Method Detail

setNewStartKey

protected boolean setNewStartKey()

Description copied from class: 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.

Specified by:

setNewStartKey in class ClientScanner

Returns:

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

createScannerCallable

protected ScannerCallable createScannerCallable()

Description copied from class: ClientScanner

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

Specified by:

createScannerCallable in class ClientScanner