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java.lang.Objectorg.apache.hadoop.hbase.filter.Filter
org.apache.hadoop.hbase.filter.FilterBase
org.apache.hadoop.hbase.filter.SkipFilter
@InterfaceAudience.Public @InterfaceStability.Stable public class SkipFilter
A wrapper filter that filters an entire row if any of the KeyValue checks do not pass.
For example, if all columns in a row represent weights of different things,
with the values being the actual weights, and we want to filter out the
entire row if any of its weights are zero. In this case, we want to prevent
rows from being emitted if a single key is filtered. Combine this filter
with a ValueFilter:
scan.setFilter(new SkipFilter(new ValueFilter(CompareOp.NOT_EQUAL,
new BinaryComparator(Bytes.toBytes(0))));
Any row which contained a column whose value was 0 will be filtered out
(since ValueFilter will not pass that KeyValue).
Without this filter, the other non-zero valued columns in the row would still
be emitted.
| Nested Class Summary |
|---|
| Nested classes/interfaces inherited from class org.apache.hadoop.hbase.filter.Filter |
|---|
Filter.ReturnCode |
| Constructor Summary | |
|---|---|
SkipFilter(Filter filter)
|
|
| Method Summary | |
|---|---|
Filter.ReturnCode |
filterKeyValue(KeyValue v)
Filters that dont filter by key value can inherit this implementation that includes all KeyValues. |
boolean |
filterRow()
Filters that never filter by rows based on previously gathered state from FilterBase.filterKeyValue(KeyValue) can inherit this implementation that
never filters a row. |
Filter |
getFilter()
|
boolean |
hasFilterRow()
Fitlers that never filter by modifying the returned List of KeyValues can inherit this implementation that does nothing. |
boolean |
isFamilyEssential(byte[] name)
By default, we require all scan's column families to be present. |
static SkipFilter |
parseFrom(byte[] pbBytes)
|
void |
reset()
Filters that are purely stateless and do nothing in their reset() methods can inherit this null/empty implementation. |
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. |
KeyValue |
transform(KeyValue v)
By default no transformation takes place |
| Methods inherited from class org.apache.hadoop.hbase.filter.FilterBase |
|---|
createFilterFromArguments, filterAllRemaining, filterRow, filterRowKey, getNextKeyHint |
| Methods inherited from class java.lang.Object |
|---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
| Constructor Detail |
|---|
public SkipFilter(Filter filter)
| Method Detail |
|---|
public Filter getFilter()
public void reset()
throws IOException
FilterBase
reset in class FilterBaseIOException - in case an I/O or an filter specific failure needs to be signaled.
public Filter.ReturnCode filterKeyValue(KeyValue v)
throws IOException
FilterBase
filterKeyValue in class FilterBasev - the KeyValue in question
IOException - in case an I/O or an filter specific failure needs to be signaled.Filter.ReturnCode
public KeyValue transform(KeyValue v)
throws IOException
FilterBase
transform in class FilterBasev - the KeyValue in question
IOException - in case an I/O or an filter specific failure needs to be signaled.The 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 boolean filterRow()
FilterBaseFilterBase.filterKeyValue(KeyValue) can inherit this implementation that
never filters a row.
filterRow in class FilterBasepublic boolean hasFilterRow()
FilterBase
hasFilterRow in class FilterBase
public byte[] toByteArray()
throws IOException
FilterBase
toByteArray in class FilterBaseIOException - in case an I/O or an filter specific failure needs to be signaled.
public static SkipFilter parseFrom(byte[] pbBytes)
throws DeserializationException
pbBytes - A pb serialized SkipFilter instance
SkipFilter made from bytes
DeserializationExceptiontoByteArray()
public boolean isFamilyEssential(byte[] name)
throws IOException
FilterBase
isFamilyEssential in class FilterBaseIOException - in case an I/O or an filter specific failure needs to be signaled.public String toString()
FilterBase
toString in class FilterBase
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