Built-in load balancing policies - 6.3

Talend ESB Mediation Developer Guide

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6.3
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Talend Data Fabric
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Design and Development
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Camel provides the following policies out-of-the-box:

Policy

Description

Round Robin

The exchanges are selected from in a round robin fashion. This is a well known and classic policy, which spreads the load evenly.

Random

A random endpoint is selected for each exchange.

Sticky

Sticky load balancing using an Expression to calculate a correlation key to perform the sticky load balancing; rather like jsessionid in the web or JMSXGroupID in JMS.

Topic

Topic which sends to all destinations (rather like JMS Topics).

Failover

In case of failures the exchange is tried on the next endpoint.

Weighted Round Robin

Camel 2.5: The weighted load balancing policy allows you to specify a processing load distribution ratio for each server with respect to the others. In addition to the weight, endpoint selection is then further refined using round-robin distribution based on weight.

Weighted Random

Camel 2.5: The weighted load balancing policy allows you to specify a processing load distribution ratio for each server with respect to others.In addition to the weight, endpoint selection is then further refined using random distribution based on weight.

Custom

Camel 2.8: From Camel 2.8 onwards the preferred way of using a custom Load Balancer is to use this policy, instead of using the @deprecated ref attribute.

Circuit Breaker

Camel 2.14: Implements the Circuit Breaker pattern as described in "Release it!" book.

Important

If you are proxying and load balancing HTTP, then see this page for more details.