@InterfaceAudience.Public public class KeyOnlyFilter extends org.apache.hadoop.hbase.filter.FilterBase
This filter can be used to grab all of the keys without having to also grab the values.
Filter.ReturnCode
Constructor and Description |
---|
KeyOnlyFilter() |
KeyOnlyFilter(boolean lenAsVal) |
Modifier and Type | Method and Description |
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static Filter |
createFilterFromArguments(ArrayList<byte[]> filterArguments) |
boolean |
equals(Object obj) |
Filter.ReturnCode |
filterCell(Cell ignored)
A way to filter based on the column family, column qualifier and/or the column value.
|
boolean |
filterRowKey(Cell cell)
Filters a row based on the row key.
|
int |
hashCode() |
static KeyOnlyFilter |
parseFrom(byte[] pbBytes)
Parse a serialized representation of
KeyOnlyFilter |
byte[] |
toByteArray()
Returns The filter serialized using pb
|
Cell |
transformCell(Cell cell)
By default no transformation takes place Give the filter a chance to transform the passed KeyValue.
|
filterAllRemaining, filterRow, filterRowCells, getNextCellHint, hasFilterRow, isFamilyEssential, reset, toString
isReversed, setReversed
public KeyOnlyFilter()
public KeyOnlyFilter(boolean lenAsVal)
public boolean filterRowKey(Cell cell) throws IOException
Filter
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
.filterRowKey
in class org.apache.hadoop.hbase.filter.FilterBase
cell
- The first cell coming in the new rowIOException
- in case an I/O or an filter specific failure needs to be signaled.public Cell transformCell(Cell cell)
org.apache.hadoop.hbase.filter.FilterBase
transformCell
in class org.apache.hadoop.hbase.filter.FilterBase
cell
- the KeyValue in questionThe transformed KeyValue is what is
eventually returned to the client. Most filters will return the passed KeyValue unchanged.
,
for an example of a
transformation. Concrete implementers can signal a failure condition in their code by
throwing an {@link IOException}.
public Filter.ReturnCode filterCell(Cell ignored) throws IOException
Filter
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
.filterCell
in class Filter
ignored
- the Cell in questionIOException
- in case an I/O or an filter specific failure needs to be signaled.Filter.ReturnCode
public static Filter createFilterFromArguments(ArrayList<byte[]> filterArguments)
public byte[] toByteArray()
toByteArray
in class org.apache.hadoop.hbase.filter.FilterBase
public static KeyOnlyFilter parseFrom(byte[] pbBytes) throws org.apache.hadoop.hbase.exceptions.DeserializationException
KeyOnlyFilter
pbBytes
- A pb serialized KeyOnlyFilter
instanceKeyOnlyFilter
made from bytes
org.apache.hadoop.hbase.exceptions.DeserializationException
- if an error occurredtoByteArray()
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