Package org.apache.druid.timeline.partition

Enum HashPartitionFunction

java.lang.Object

java.lang.Enum<HashPartitionFunction>

org.apache.druid.timeline.partition.HashPartitionFunction

All Implemented Interfaces:

Serializable, Comparable<HashPartitionFunction>

public enum HashPartitionFunction
extends Enum<HashPartitionFunction>

An enum of supported hash partition functions. This enum should be updated when we want to use a new function for hash partitioning. All partition functions listed in this enum must be backwards-compatible as the hash function should apply to all segments in the same way no matter what Druid version was used to create those segments. This function is a part of HashBasedNumberedShardSpec which is stored in the metadata store.

Enum Constant Summary

Enum Constants

Enum Constant	Description
MURMUR3_32_ABS

Method Summary

Modifier and Type	Method	Description
static HashPartitionFunction	fromString(String type)
abstract int	hash(byte[] serializedRow, int numBuckets)	Returns an ID of a hash bucket for the given serializedRow.
String	toString()
static HashPartitionFunction	valueOf(String name)	Returns the enum constant of this type with the specified name.
static HashPartitionFunction[]	values()	Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

MURMUR3_32_ABS

public static final HashPartitionFunction MURMUR3_32_ABS

Method Detail

values

public static HashPartitionFunction[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (HashPartitionFunction c : HashPartitionFunction.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static HashPartitionFunction valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum type has no constant with the specified name

NullPointerException - if the argument is null

hash

public abstract int hash(byte[] serializedRow,
                         int numBuckets)

Returns an ID of a hash bucket for the given serializedRow.

fromString

public static HashPartitionFunction fromString(String type)

toString

public String toString()

Overrides:

toString in class Enum<HashPartitionFunction>