com.mapr.fs.hbase.filter

Class KeySamplingFilter

java.lang.Object

org.apache.hadoop.hbase.filter.Filter

org.apache.hadoop.hbase.filter.FilterBase

com.mapr.fs.hbase.filter.KeySamplingFilter

@InterfaceAudience.Public
 @InterfaceStability.Stable
public class KeySamplingFilter
extends org.apache.hadoop.hbase.filter.FilterBase

A filter that will only return the first KV from each row.

This filter can be used to more efficiently perform row count operations.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.hadoop.hbase.filter.Filter

org.apache.hadoop.hbase.filter.Filter.ReturnCode

Field Summary

Fields inherited from class org.apache.hadoop.hbase.filter.Filter

reversed

Constructor Summary

Constructors

Constructor and Description
KeySamplingFilter()

Method Summary

Modifier and Type	Method and Description
static org.apache.hadoop.hbase.filter.Filter	createFilterFromArguments(java.util.ArrayList<byte[]> filterArguments)
org.apache.hadoop.hbase.filter.Filter.ReturnCode	filterKeyValue(org.apache.hadoop.hbase.Cell v)
static KeySamplingFilter	parseFrom(byte[] pbBytes)

Methods inherited from class org.apache.hadoop.hbase.filter.FilterBase

filterAllRemaining, filterRow, filterRowCells, filterRowKey, getNextCellHint, getNextKeyHint, hasFilterRow, isFamilyEssential, reset, toByteArray, toString, transform, transformCell

Methods inherited from class org.apache.hadoop.hbase.filter.Filter

isReversed, setReversed

Methods inherited from class java.lang.Object

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

Constructor Detail

KeySamplingFilter

public KeySamplingFilter()

Method Detail

createFilterFromArguments

public static org.apache.hadoop.hbase.filter.Filter createFilterFromArguments(java.util.ArrayList<byte[]> filterArguments)

parseFrom

public static KeySamplingFilter parseFrom(byte[] pbBytes)
                                   throws org.apache.hadoop.hbase.exceptions.DeserializationException

Parameters:

pbBytes - A pb serialized FirstKeyOnlyFilter instance

Returns:

An instance of FirstKeyOnlyFilter made from bytes

Throws:

org.apache.hadoop.hbase.exceptions.DeserializationException

See Also:

FilterBase.toByteArray()

filterKeyValue

public org.apache.hadoop.hbase.filter.Filter.ReturnCode filterKeyValue(org.apache.hadoop.hbase.Cell v)
                                                                throws java.io.IOException

Specified by:

filterKeyValue in class org.apache.hadoop.hbase.filter.Filter

Throws:

java.io.IOException