Package org.apache.pinot.spi.utils

Enum CommonConstants.Broker.AdaptiveServerSelector.Type

java.lang.Object

java.lang.Enum<CommonConstants.Broker.AdaptiveServerSelector.Type>

org.apache.pinot.spi.utils.CommonConstants.Broker.AdaptiveServerSelector.Type

All Implemented Interfaces:

Serializable, Comparable<CommonConstants.Broker.AdaptiveServerSelector.Type>, java.lang.constant.Constable

Enclosing class:

CommonConstants.Broker.AdaptiveServerSelector

public static enum CommonConstants.Broker.AdaptiveServerSelector.Type
extends Enum<CommonConstants.Broker.AdaptiveServerSelector.Type>

Adaptive Server Selection feature has 2 parts: 1. Stats Collection 2. Routing Strategy Stats Collection is controlled by the config CONFIG_OF_ENABLE_STATS_COLLECTION. Routing Strategy is controlled by the config CONFIG_OF_TYPE. Stats Collection: Enabling/Disabling stats collection will dictate whether stats (like latency, # of inflight requests) will be collected when queries are routed to/received from servers. It does not have any impact on the Server Selection Strategy used. Routing Strategy: Decides what strategy should be used to pick a server. Note that this routing strategy complements the existing Balanced/ReplicaGroup/StrictReplicaGroup strategies and is not a replacement.The available strategies are as follows: 1. NO_OP: Uses the default behavior offered by Balanced/ReplicaGroup/StrictReplicaGroup instance selectors. Does NOT require Stats Collection to be enabled. 2. NUM_INFLIGHT_REQ: Picks the best server based on the number of inflight requests for each server. Requires Stats Collection to be enabled. 3. LATENCY: Picks the best server based on the Exponential Weighted Moving Averge of Latency for each server. Requires Stats Collection to be enabled. 4. HYBRID: Picks the best server by computing a custom hybrid score based on both latency and # inflight requests. This is based on the approach described in the paper https://www.usenix.org/system/files/conference/nsdi15/nsdi15-paper-suresh.pdf. Requires Stats Collection to be enabled.

Nested Class Summary

Nested classes/interfaces inherited from class java.lang.Enum

Enum.EnumDesc<E extends Enum<E>>

Enum Constant Summary

Enum Constants

Enum Constant	Description
HYBRID
LATENCY
NO_OP
NUM_INFLIGHT_REQ

Method Summary

Modifier and Type	Method	Description
static CommonConstants.Broker.AdaptiveServerSelector.Type	valueOf(String name)	Returns the enum constant of this type with the specified name.
static CommonConstants.Broker.AdaptiveServerSelector.Type[]	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, describeConstable, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

NO_OP

public static final CommonConstants.Broker.AdaptiveServerSelector.Type NO_OP

NUM_INFLIGHT_REQ

public static final CommonConstants.Broker.AdaptiveServerSelector.Type NUM_INFLIGHT_REQ

LATENCY

public static final CommonConstants.Broker.AdaptiveServerSelector.Type LATENCY

HYBRID

public static final CommonConstants.Broker.AdaptiveServerSelector.Type HYBRID

Method Detail

values

public static CommonConstants.Broker.AdaptiveServerSelector.Type[] values()

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

Returns:

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

valueOf

public static CommonConstants.Broker.AdaptiveServerSelector.Type 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