org.apache.cassandra.config

Enum Config.PaxosVariant

java.lang.Object

java.lang.Enum<Config.PaxosVariant>

org.apache.cassandra.config.Config.PaxosVariant

All Implemented Interfaces:

java.io.Serializable, java.lang.Comparable<Config.PaxosVariant>

Enclosing class:

Config

public static enum Config.PaxosVariant
extends java.lang.Enum<Config.PaxosVariant>

The variants of paxos implementation and semantics supported by Cassandra.

Enum Constant Summary

Enum Constants

Enum Constant and Description
v1 v1 Paxos lacks most optimisations.
v1_without_linearizable_reads_or_rejected_writes v1 Paxos lacks most optimisations.
v2 v2 Paxos.
v2_without_linearizable_reads v2 Paxos.
v2_without_linearizable_reads_or_rejected_writes v2 Paxos.

Method Summary

Modifier and Type	Method and Description
static Config.PaxosVariant	valueOf(java.lang.String name) Returns the enum constant of this type with the specified name.
static Config.PaxosVariant[]	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

v1_without_linearizable_reads_or_rejected_writes

public static final Config.PaxosVariant v1_without_linearizable_reads_or_rejected_writes

v1 Paxos lacks most optimisations. Expect 4RTs for a write and 2RTs for a read. With legacy semantics for read/read and rejected write linearizability, i.e. not guaranteed.

v1

public static final Config.PaxosVariant v1

v1 Paxos lacks most optimisations. Expect 4RTs for a write and 3RTs for a read.

v2_without_linearizable_reads

public static final Config.PaxosVariant v2_without_linearizable_reads

v2 Paxos. With PaxosStatePurging.repaired safe to use ANY Commit consistency. Expect 2RTs for a write and 1RT for a read. With legacy semantics for read/read linearizability, i.e. not guaranteed.

v2_without_linearizable_reads_or_rejected_writes

public static final Config.PaxosVariant v2_without_linearizable_reads_or_rejected_writes

v2 Paxos. With PaxosStatePurging.repaired safe to use ANY Commit consistency. Expect 2RTs for a write and 1RT for a read. With legacy semantics for read/read and rejected write linearizability, i.e. not guaranteed.

v2

public static final Config.PaxosVariant v2

v2 Paxos. With PaxosStatePurging.repaired safe to use ANY Commit consistency. Expect 2RTs for a write, and either 1RT or 2RT for a read.

Method Detail

values

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

Returns:

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

valueOf

public static Config.PaxosVariant valueOf(java.lang.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:

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

java.lang.NullPointerException - if the argument is null