Package org.apache.cassandra.io.sstable.format

Class FilterComponent

java.lang.Object

org.apache.cassandra.io.sstable.format.FilterComponent

public class FilterComponent
extends Object

Method Summary

Modifier and Type	Method	Description
static IFilter	load(Descriptor descriptor)	Load bloom filter from Filter.db file.
static IFilter	maybeLoadBloomFilter(Descriptor descriptor, Set<Component> components, TableMetadata metadata, ValidationMetadata validationMetadata)	Optionally loads a Bloom filter.
static void	save(IFilter filter, Descriptor descriptor, boolean deleteOnFailure)

Methods inherited from class java.lang.Object

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

Method Details

load

public static IFilter load(Descriptor descriptor)
                    throws IOException

Load bloom filter from Filter.db file.

Throws:

IOException

save

public static void save(IFilter filter,
 Descriptor descriptor,
 boolean deleteOnFailure)
                 throws IOException

Throws:

IOException

maybeLoadBloomFilter

public static IFilter maybeLoadBloomFilter(Descriptor descriptor,
 Set<Component> components,
 TableMetadata metadata,
 ValidationMetadata validationMetadata)

Optionally loads a Bloom filter. If the filter is not needed (FP chance is neglectable), it returns FilterFactory.AlwaysPresent. If the filter is expected to be recreated for various reasons the method returns null. Otherwise, an attempt to load the filter is made and if it succeeds, the loaded filter is returned. If loading fails, the method returns null.

Returns:

FilterFactory.AlwaysPresent, loaded filter or null (which means that the filter should be rebuilt)