org.hbase.async

Class FuzzyRowFilter

java.lang.Object

org.hbase.async.ScanFilter

org.hbase.async.FuzzyRowFilter

public final class FuzzyRowFilter
extends ScanFilter

FuzzyRowFilter is a server-side fast-forward filter that allows skipping whole range of rows when scanning. The feature is available in HBase 0.94.5 and above.

It takes two byte array to match a rowkey, one to hold the fixed value and one to hold a mask indicating which bytes of the rowkey must match the fixed value. The two arrays must have the same length.

Bytes in the mask can take two values, 0 meaning that the corresponding byte in the rowkey must match the corresponding fixed byte and 1 meaning that the corresponding byte in the rowkey can take any value.

One can combine several FuzzyRowFilter.FuzzyFilterPair to match multiple patterns at once.

Example : You store logs with this rowkey design : group(3bytes)timestamp(4bytes)severity(1byte) You want to get all FATAL("5") logs : * Build a FuzzyFilterPair with - rowkey : "????????5" - fuzzy mask : "111111110" And CRITICAL("4") logs only for web servers : * Add another FuzzyFilterPair with - rowkey : "web????4" - fuzzy mask : "00011110"

Since:

1.7

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	FuzzyRowFilter.FuzzyFilterPair Holds a pair of (row_key,fuzzy_mask) to use with FuzzyRowFilter

Constructor Summary

Constructors

Constructor and Description
FuzzyRowFilter(Collection<FuzzyRowFilter.FuzzyFilterPair> filter_pairs) Ctor to take a list of filters to apply against row keys
FuzzyRowFilter(FuzzyRowFilter.FuzzyFilterPair filter_pair) Default ctor that applies a single fuzzy filter against all row keys

Method Summary

Methods

Modifier and Type	Method and Description
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

FuzzyRowFilter

public FuzzyRowFilter(FuzzyRowFilter.FuzzyFilterPair filter_pair)

Default ctor that applies a single fuzzy filter against all row keys

Parameters:

filter_pair - A single filter to apply to all row keys

FuzzyRowFilter

public FuzzyRowFilter(Collection<FuzzyRowFilter.FuzzyFilterPair> filter_pairs)

Ctor to take a list of filters to apply against row keys

Parameters:

filter_pairs - One or more filter pairs in a collection to apply against the row keys

Method Detail

toString

public String toString()

Overrides:

toString in class Object