org.apache.hadoop.hbase.filter

Class TimestampsFilter

java.lang.Object

org.apache.hadoop.hbase.filter.Filter

org.apache.hadoop.hbase.filter.FilterBase

org.apache.hadoop.hbase.filter.TimestampsFilter

@InterfaceAudience.Public
public class TimestampsFilter
extends FilterBase

Filter that returns only cells whose timestamp (version) is in the specified list of timestamps (versions).

Note: Use of this filter overrides any time range/time stamp options specified using Get.setTimeRange(long, long), Scan.setTimeRange(long, long), Get.setTimestamp(long), or Scan.setTimestamp(long).

Nested Class Summary

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

Filter.ReturnCode

Field Summary

Fields

Modifier and Type	Field and Description
private boolean	canHint
private static int	MAX_LOG_TIMESTAMPS
(package private) long	minTimestamp
(package private) TreeSet<Long>	timestamps

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

reversed

Constructor Summary

Constructors

Constructor and Description
TimestampsFilter(List<Long> timestamps) Constructor for filter that retains only the specified timestamps in the list.
TimestampsFilter(List<Long> timestamps, boolean canHint) Constructor for filter that retains only those cells whose timestamp (version) is in the specified list of timestamps.

Method Summary

Modifier and Type	Method and Description
(package private) boolean	areSerializedFieldsEqual(Filter o) Default implementation so that writers of custom filters aren't forced to implement.
static Filter	createFilterFromArguments(ArrayList<byte[]> filterArguments)
boolean	equals(Object obj)
Filter.ReturnCode	filterCell(Cell c) A way to filter based on the column family, column qualifier and/or the column value.
Filter.ReturnCode	filterKeyValue(Cell c) Deprecated.
boolean	filterRowKey(Cell cell) Filters a row based on the row key.
long	getMin() Gets the minimum timestamp requested by filter.
Cell	getNextCellHint(Cell currentCell) Pick the next cell that the scanner should seek to.
List<Long>	getTimestamps()
int	hashCode()
private void	init()
static TimestampsFilter	parseFrom(byte[] pbBytes)
byte[]	toByteArray() Return length 0 byte array for Filters that don't require special serialization
String	toString() Return filter's info for debugging and logging purpose.
protected String	toString(int maxTimestamps)

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

filterAllRemaining, filterRow, filterRowCells, filterRowKey, hasFilterRow, isFamilyEssential, reset, transformCell

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

isReversed, setReversed

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

canHint

private final boolean canHint

timestamps

TreeSet<Long> timestamps

MAX_LOG_TIMESTAMPS

private static final int MAX_LOG_TIMESTAMPS

See Also:

Constant Field Values

minTimestamp

long minTimestamp

Constructor Detail

TimestampsFilter

public TimestampsFilter(List<Long> timestamps)

Constructor for filter that retains only the specified timestamps in the list.

Parameters:

timestamps -

TimestampsFilter

public TimestampsFilter(List<Long> timestamps,
                        boolean canHint)

Constructor for filter that retains only those cells whose timestamp (version) is in the specified list of timestamps.

Parameters:

timestamps - list of timestamps that are wanted.

canHint - should the filter provide a seek hint? This can skip past delete tombstones, so it should only be used when that is not an issue ( no deletes, or don't care if data becomes visible)

Method Detail

getTimestamps

public List<Long> getTimestamps()

Returns:

the list of timestamps

init

private void init()

getMin

public long getMin()

Gets the minimum timestamp requested by filter.

Returns:

minimum timestamp requested by filter.

filterRowKey

public boolean filterRowKey(Cell cell)
                     throws IOException

Description copied from class: Filter

Filters a row based on the row key. If this returns true, the entire row will be excluded. If false, each KeyValue in the row will be passed to Filter.filterCell(Cell) below. If Filter.filterAllRemaining() returns true, then Filter.filterRowKey(Cell) should also return true. Concrete implementers can signal a failure condition in their code by throwing an IOException.

Overrides:

filterRowKey in class FilterBase

Parameters:

cell - The first cell coming in the new row

Returns:

true, remove entire row, false, include the row (maybe).

Throws:

IOException - in case an I/O or an filter specific failure needs to be signaled.

filterKeyValue

@Deprecated
public Filter.ReturnCode filterKeyValue(Cell c)

Deprecated.

Description copied from class: Filter

A way to filter based on the column family, column qualifier and/or the column value. Return code is described below. This allows filters to filter only certain number of columns, then terminate without matching ever column. If filterRowKey returns true, filterKeyValue needs to be consistent with it. filterKeyValue can assume that filterRowKey has already been called for the row. If your filter returns ReturnCode.NEXT_ROW, it should return ReturnCode.NEXT_ROW until Filter.reset() is called just in case the caller calls for the next row. Concrete implementers can signal a failure condition in their code by throwing an IOException.

Overrides:

filterKeyValue in class Filter

Parameters:

c - the Cell in question

Returns:

code as described below, Filter.ReturnCode.INCLUDE by default

See Also:

Filter.ReturnCode

filterCell

public Filter.ReturnCode filterCell(Cell c)

Description copied from class: Filter

A way to filter based on the column family, column qualifier and/or the column value. Return code is described below. This allows filters to filter only certain number of columns, then terminate without matching ever column. If filterRowKey returns true, filterCell needs to be consistent with it. filterCell can assume that filterRowKey has already been called for the row. If your filter returns ReturnCode.NEXT_ROW, it should return ReturnCode.NEXT_ROW until Filter.reset() is called just in case the caller calls for the next row. Concrete implementers can signal a failure condition in their code by throwing an IOException.

Overrides:

filterCell in class Filter

Parameters:

c - the Cell in question

Returns:

code as described below

See Also:

Filter.ReturnCode

getNextCellHint

public Cell getNextCellHint(Cell currentCell)
                     throws IOException

Pick the next cell that the scanner should seek to. Since this can skip any number of cells any of which can be a delete this can resurect old data. The method will only be used if canHint was set to true while creating the filter.

Overrides:

getNextCellHint in class FilterBase

Returns:

KeyValue which must be next seeked. return null if the filter is not sure which key to seek to next.

Throws:

IOException - This will never happen.

createFilterFromArguments

public static Filter createFilterFromArguments(ArrayList<byte[]> filterArguments)

toByteArray

public byte[] toByteArray()

Description copied from class: FilterBase

Return length 0 byte array for Filters that don't require special serialization

Overrides:

toByteArray in class FilterBase

Returns:

The filter serialized using pb

parseFrom

public static TimestampsFilter parseFrom(byte[] pbBytes)
                                  throws DeserializationException

Parameters:

pbBytes - A pb serialized TimestampsFilter instance

Returns:

An instance of TimestampsFilter made from bytes

Throws:

DeserializationException

See Also:

toByteArray()

areSerializedFieldsEqual

boolean areSerializedFieldsEqual(Filter o)

Description copied from class: FilterBase

Default implementation so that writers of custom filters aren't forced to implement.

Overrides:

areSerializedFieldsEqual in class FilterBase

Parameters:

o - the other filter to compare with

Returns:

true if and only if the fields of the filter that are serialized are equal to the corresponding fields in other. Used for testing.

toString

public String toString()

Description copied from class: FilterBase

Return filter's info for debugging and logging purpose.

Overrides:

toString in class FilterBase

toString

protected String toString(int maxTimestamps)

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object