org.apache.hadoop.hbase.regionserver

Class StoreUtils

java.lang.Object

org.apache.hadoop.hbase.regionserver.StoreUtils

@InterfaceAudience.Private
public class StoreUtils
extends Object

Utility functions for region server storage layer.

Constructor Summary

Constructors

Constructor and Description
StoreUtils()

Method Summary

Modifier and Type	Method and Description
static org.apache.hadoop.conf.Configuration	createStoreConfiguration(org.apache.hadoop.conf.Configuration conf, TableDescriptor td, ColumnFamilyDescriptor cfd)
static int	getBytesPerChecksum(org.apache.hadoop.conf.Configuration conf) Returns the configured bytesPerChecksum value.
static ChecksumType	getChecksumType(org.apache.hadoop.conf.Configuration conf) Returns the configured checksum algorithm.
static OptionalInt	getDeterministicRandomSeed(Collection<HStoreFile> files) Creates a deterministic hash code for store file collection.
static long	getLowestTimestamp(Collection<HStoreFile> candidates) Gets lowest timestamp from candidate StoreFiles
static OptionalLong	getMaxMemStoreTSInList(Collection<HStoreFile> sfs) Return the largest memstoreTS found across all storefiles in the given list.
static OptionalLong	getMaxSequenceIdInList(Collection<HStoreFile> sfs) Return the highest sequence ID found across all storefiles in the given list.
static boolean	hasReferences(Collection<HStoreFile> files) Determines whether any files in the collection are references.

Methods inherited from class java.lang.Object

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

Constructor Detail

StoreUtils

public StoreUtils()

Method Detail

getDeterministicRandomSeed

public static OptionalInt getDeterministicRandomSeed(Collection<HStoreFile> files)

Creates a deterministic hash code for store file collection.

hasReferences

public static boolean hasReferences(Collection<HStoreFile> files)

Determines whether any files in the collection are references.

Parameters:

files - The files.

getLowestTimestamp

public static long getLowestTimestamp(Collection<HStoreFile> candidates)
                               throws IOException

Gets lowest timestamp from candidate StoreFiles

Throws:

IOException

getMaxMemStoreTSInList

public static OptionalLong getMaxMemStoreTSInList(Collection<HStoreFile> sfs)

Return the largest memstoreTS found across all storefiles in the given list. Store files that were created by a mapreduce bulk load are ignored, as they do not correspond to any specific put operation, and thus do not have a memstoreTS associated with them.

getMaxSequenceIdInList

public static OptionalLong getMaxSequenceIdInList(Collection<HStoreFile> sfs)

Return the highest sequence ID found across all storefiles in the given list.

getChecksumType

public static ChecksumType getChecksumType(org.apache.hadoop.conf.Configuration conf)

Returns the configured checksum algorithm.

Parameters:

conf - The configuration

Returns:

The checksum algorithm that is set in the configuration

getBytesPerChecksum

public static int getBytesPerChecksum(org.apache.hadoop.conf.Configuration conf)

Returns the configured bytesPerChecksum value.

Parameters:

conf - The configuration

Returns:

The bytesPerChecksum that is set in the configuration

createStoreConfiguration

public static org.apache.hadoop.conf.Configuration createStoreConfiguration(org.apache.hadoop.conf.Configuration conf,
                                                                            TableDescriptor td,
                                                                            ColumnFamilyDescriptor cfd)