Package org.apache.flink.optimizer.dataproperties

Enum PartitioningProperty

java.lang.Object

java.lang.Enum<PartitioningProperty>

org.apache.flink.optimizer.dataproperties.PartitioningProperty

All Implemented Interfaces:

Serializable, Comparable<PartitioningProperty>

public enum PartitioningProperty
extends Enum<PartitioningProperty>

An enumeration of the different types of distributing data across partitions or parallel workers.

Enum Constant Summary

Enum Constants

Enum Constant	Description
ANY_DISTRIBUTION	Any possible way of data distribution, including random partitioning and full replication.
ANY_PARTITIONING	A not further specified partitioning on a key (hash-, or range partitioning, or some other scheme even).
CUSTOM_PARTITIONING	A custom partitioning, accompanied by a Partitioner.
FORCED_REBALANCED	A forced even re-balancing.
FULL_REPLICATION	Full replication of the data to each parallel instance.
HASH_PARTITIONED	A hash partitioning on a certain key.
RANDOM_PARTITIONED	A random disjunct (non-replicated) data distribution, where each datum is contained in one partition only.
RANGE_PARTITIONED	A range partitioning on a certain key.

Method Summary

Modifier and Type	Method	Description
boolean	isComputablyPartitioned()	Checks, if this property represents a partitioning that is computable.
boolean	isPartitioned()	Checks, if this property represents in fact a partitioning.
boolean	isPartitionedOnKey()	Checks if this property presents a partitioning that is not random, but on a partitioning key.
boolean	isReplication()	Checks, if this property represents a full replication.
static PartitioningProperty	valueOf(String name)	Returns the enum constant of this type with the specified name.
static PartitioningProperty[]	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, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

ANY_DISTRIBUTION

public static final PartitioningProperty ANY_DISTRIBUTION

Any possible way of data distribution, including random partitioning and full replication.

RANDOM_PARTITIONED

public static final PartitioningProperty RANDOM_PARTITIONED

A random disjunct (non-replicated) data distribution, where each datum is contained in one partition only. This is for example the result of parallel scans of data in a file system like HDFS, or the result of a round-robin data distribution.

HASH_PARTITIONED

public static final PartitioningProperty HASH_PARTITIONED

A hash partitioning on a certain key.

RANGE_PARTITIONED

public static final PartitioningProperty RANGE_PARTITIONED

A range partitioning on a certain key.

ANY_PARTITIONING

public static final PartitioningProperty ANY_PARTITIONING

A not further specified partitioning on a key (hash-, or range partitioning, or some other scheme even).

FULL_REPLICATION

public static final PartitioningProperty FULL_REPLICATION

Full replication of the data to each parallel instance.

FORCED_REBALANCED

public static final PartitioningProperty FORCED_REBALANCED

A forced even re-balancing. All partitions are guaranteed to have almost the same number of records.

CUSTOM_PARTITIONING

public static final PartitioningProperty CUSTOM_PARTITIONING

A custom partitioning, accompanied by a Partitioner.

Method Detail

values

public static PartitioningProperty[] 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 (PartitioningProperty c : PartitioningProperty.values())
    System.out.println(c);

Returns:

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

valueOf

public static PartitioningProperty 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

isPartitioned

public boolean isPartitioned()

Checks, if this property represents in fact a partitioning. That is, whether this property is not equal to PartitionProperty.FULL_REPLICATION.

Returns:

True, if this enum constant is unequal to PartitionProperty.FULL_REPLICATION, false otherwise.

isReplication

public boolean isReplication()

Checks, if this property represents a full replication.

Returns:

True, if this enum constant is equal to PartitionProperty.FULL_REPLICATION, false otherwise.

isPartitionedOnKey

public boolean isPartitionedOnKey()

Checks if this property presents a partitioning that is not random, but on a partitioning key.

Returns:

True, if the data is partitioned on a key.

isComputablyPartitioned

public boolean isComputablyPartitioned()

Checks, if this property represents a partitioning that is computable. A computable partitioning can be recreated through an algorithm. If two sets of data are to be co-partitioned, it is crucial, that the partitioning schemes are computable.

Examples for computable partitioning schemes are hash- or range-partitioning. An example for a non-computable partitioning is the implicit partitioning that exists though a globally unique key.

Returns:

True, if this enum constant is a re-computable partitioning.