Package org.apache.hadoop.hbase.filter

Provides row-level filters applied to HRegion scan results during calls to ResultScanner.next().

See: Description

Class Summary

Class	Description
BigDecimalComparator	A BigDecimal comparator which numerical compares against the specified byte array
BinaryComparator	A binary comparator which lexicographically compares against the specified byte array using Bytes.compareTo(byte[], byte[]).
BinaryComponentComparator	A comparator which compares against a specified byte array, but only compares specific portion of the byte array.
BinaryPrefixComparator	A comparator which compares against a specified byte array, but only compares up to the length of this byte array.
BitComparator	A bit comparator which performs the specified bitwise operation on each of the bytes with the specified byte array.
ByteArrayComparable	Base class for byte array comparators
ColumnCountGetFilter	Simple filter that returns first N columns on row only.
ColumnPaginationFilter	A filter, based on the ColumnCountGetFilter, takes two arguments: limit and offset.
ColumnPrefixFilter	This filter is used for selecting only those keys with columns that matches a particular prefix.
ColumnRangeFilter	This filter is used for selecting only those keys with columns that are between minColumn to maxColumn.
ColumnValueFilter	Different from SingleColumnValueFilter which returns an entire row when specified condition is matched, ColumnValueFilter return the matched cell only.
CompareFilter	This is a generic filter to be used to filter by comparison.
DependentColumnFilter	A filter for adding inter-column timestamp matching Only cells with a correspondingly timestamped entry in the target column will be retained Not compatible with Scan.setBatch as operations need full rows for correct filtering
FamilyFilter	This filter is used to filter based on the column family.
Filter	Interface for row and column filters directly applied within the regionserver.
FilterList	Implementation of Filter that represents an ordered List of Filters which will be evaluated with a specified boolean operator FilterList.Operator.MUST_PASS_ALL (AND) or FilterList.Operator.MUST_PASS_ONE (OR).
FirstKeyOnlyFilter	A filter that will only return the first KV from each row.
FirstKeyValueMatchingQualifiersFilter	Deprecated Deprecated in 2.0.0 and will be removed in 3.0.0.
FuzzyRowFilter	This is optimized version of a standard FuzzyRowFilter Filters data based on fuzzy row key.
InclusiveStopFilter	A Filter that stops after the given row.
KeyOnlyFilter	A filter that will only return the key component of each KV (the value will be rewritten as empty).
LongComparator	A long comparator which numerical compares against the specified byte array
MultipleColumnPrefixFilter	This filter is used for selecting only those keys with columns that matches a particular prefix.
MultiRowRangeFilter	Filter to support scan multiple row key ranges.
MultiRowRangeFilter.RowRange
NullComparator	A binary comparator which lexicographically compares against the specified byte array using Bytes.compareTo(byte[], byte[]).
PageFilter	Implementation of Filter interface that limits results to a specific page size.
ParseConstants	ParseConstants holds a bunch of constants related to parsing Filter Strings Used by ParseFilter
ParseFilter	This class allows a user to specify a filter via a string The string is parsed using the methods of this class and a filter object is constructed.
PrefixFilter	Pass results that have same row prefix.
QualifierFilter	This filter is used to filter based on the column qualifier.
RandomRowFilter	A filter that includes rows based on a chance.
RegexStringComparator	This comparator is for use with CompareFilter implementations, such as RowFilter, QualifierFilter, and ValueFilter, for filtering based on the value of a given column.
RowFilter	This filter is used to filter based on the key.
SingleColumnValueExcludeFilter	A Filter that checks a single column value, but does not emit the tested column.
SingleColumnValueFilter	This filter is used to filter cells based on value.
SkipFilter	A wrapper filter that filters an entire row if any of the Cell checks do not pass.
SubstringComparator	This comparator is for use with SingleColumnValueFilter, for filtering based on the value of a given column.
TimestampsFilter	Filter that returns only cells whose timestamp (version) is in the specified list of timestamps (versions).
ValueFilter	This filter is used to filter based on column value.
WhileMatchFilter	A wrapper filter that returns true from WhileMatchFilter.filterAllRemaining() as soon as the wrapped filters Filter.filterRowKey(byte[], int, int), Filter.filterCell(org.apache.hadoop.hbase.Cell), Filter.filterRow() or Filter.filterAllRemaining() methods returns true.

Enum Summary

Enum	Description
BitComparator.BitwiseOp	Bit operators.
CompareFilter.CompareOp	Deprecated since 2.0.0.
Filter.ReturnCode	Return codes for filterValue().
FilterList.Operator	set operator
RegexStringComparator.EngineType	Engine implementation type (default=JAVA)

Exception Summary

Exception	Description
IncompatibleFilterException	Used to indicate a filter incompatibility
InvalidRowFilterException	Used to indicate an invalid RowFilter.

Package org.apache.hadoop.hbase.filter Description

Provides row-level filters applied to HRegion scan results during calls to ResultScanner.next().

Filters run the extent of a table unless you wrap your filter in a WhileMatchFilter. The latter returns as soon as the filter stops matching.

Do not rely on filters carrying state across rows; its not reliable in current hbase as we have no handlers in place for when regions split, close or server crashes.