Package org.apache.hadoop.hbase.client

Class ClientSideRegionScanner

java.lang.Object

org.apache.hadoop.hbase.client.AbstractClientScanner

org.apache.hadoop.hbase.client.ClientSideRegionScanner

All Implemented Interfaces:

Closeable, AutoCloseable, Iterable<Result>, ResultScanner

@Private
public class ClientSideRegionScanner
extends AbstractClientScanner

A client scanner for a region opened for read-only on the client side. Assumes region data is not changing.

Field Summary

Fields

Modifier and Type	Field	Description
private BlockCache	blockCache
(package private) boolean	hasMore
private static final org.slf4j.Logger	LOG
private MobFileCache	mobFileCache
private HRegion	region
(package private) RegionScanner	scanner
(package private) List<Cell>	values

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

scanMetrics

Constructor Summary

Constructors

Constructor	Description
ClientSideRegionScanner(org.apache.hadoop.conf.Configuration conf, org.apache.hadoop.fs.FileSystem fs, org.apache.hadoop.fs.Path rootDir, TableDescriptor htd, RegionInfo hri, Scan scan, ScanMetrics scanMetrics)

Method Summary

Modifier and Type	Method	Description
void	close()	Closes the scanner and releases any resources it has allocated
(package private) HRegion	getRegion()
Result	next()	Grab the next row's worth of values.
boolean	renewLease()	Allow the client to renew the scanner's lease on the server.

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

getScanMetrics, initScanMetrics, isScanMetricsByRegionEnabled, setIsScanMetricsByRegionEnabled

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.lang.Iterable

forEach, spliterator

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

iterator, next

Field Details

LOG

private static final org.slf4j.Logger LOG

region

private HRegion region

mobFileCache

private MobFileCache mobFileCache

blockCache

private BlockCache blockCache

scanner

RegionScanner scanner

values

List<Cell> values

hasMore

boolean hasMore

Constructor Details

ClientSideRegionScanner

public ClientSideRegionScanner(org.apache.hadoop.conf.Configuration conf,
 org.apache.hadoop.fs.FileSystem fs,
 org.apache.hadoop.fs.Path rootDir,
 TableDescriptor htd,
 RegionInfo hri,
 Scan scan,
 ScanMetrics scanMetrics)
                        throws IOException

Throws:

IOException

Method Details

next

public Result next()
            throws IOException

Description copied from interface: ResultScanner

Grab the next row's worth of values. The scanner will return a Result.

Returns:

Result object if there is another row, null if the scanner is exhausted.

Throws:

IOException - e

close

public void close()

Description copied from interface: ResultScanner

Closes the scanner and releases any resources it has allocated

getRegion

HRegion getRegion()

renewLease

public boolean renewLease()

Description copied from interface: ResultScanner

Allow the client to renew the scanner's lease on the server.

Returns:

true if the lease was successfully renewed, false otherwise.