@InterfaceAudience.Public @InterfaceStability.Stable public class FirstKeyOnlyFilter extends org.apache.hadoop.hbase.filter.FilterBase
This filter can be used to more efficiently perform row count operations.
Filter.ReturnCode
Constructor and Description |
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FirstKeyOnlyFilter() |
Modifier and Type | Method and Description |
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static Filter |
createFilterFromArguments(ArrayList<byte[]> filterArguments) |
Filter.ReturnCode |
filterKeyValue(Cell v)
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.
|
protected boolean |
hasFoundKV() |
static FirstKeyOnlyFilter |
parseFrom(byte[] pbBytes) |
void |
reset()
Filters that are purely stateless and do nothing in their reset() methods can inherit
this null/empty implementation.
|
protected void |
setFoundKV(boolean value) |
byte[] |
toByteArray()
Return length 0 byte array for Filters that don't require special serialization
|
filterAllRemaining, filterRow, filterRowCells, filterRowKey, getNextCellHint, hasFilterRow, isFamilyEssential, toString, transformCell
isReversed, setReversed
public FirstKeyOnlyFilter()
public void reset()
org.apache.hadoop.hbase.filter.FilterBase
IOException
.reset
in class org.apache.hadoop.hbase.filter.FilterBase
public boolean filterRowKey(Cell cell) throws IOException
Filter
Filter.filterKeyValue(Cell)
below.
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 Filter.ReturnCode filterKeyValue(Cell v)
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
.filterKeyValue
in class Filter
v
- the Cell in questionFilter.ReturnCode
public static Filter createFilterFromArguments(ArrayList<byte[]> filterArguments)
protected boolean hasFoundKV()
protected void setFoundKV(boolean value)
value
- update foundKV
flag with value.public byte[] toByteArray()
org.apache.hadoop.hbase.filter.FilterBase
toByteArray
in class org.apache.hadoop.hbase.filter.FilterBase
public static FirstKeyOnlyFilter parseFrom(byte[] pbBytes) throws org.apache.hadoop.hbase.exceptions.DeserializationException
pbBytes
- A pb serialized FirstKeyOnlyFilter
instanceFirstKeyOnlyFilter
made from bytes
org.apache.hadoop.hbase.exceptions.DeserializationException
toByteArray()
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