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Policy	Description
Round Robin	The exchanges is selected in a round robin fashion. This is a well known and classic policy. This spreads the load even.
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	Camel 2.0: 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 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.

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The parameters that can be used are

In Camel 2.5

Option	Type	Default	Description
roundRobin	boolean	false	The default value for round-robin is false. In the absence of this setting or parameter the load balancing algorithm used is random.
distributionRatio	List<Integer>	none	The distributionRatio is a list consisting on integer weights passed in as a parameter. The distributionRatio must match the number of endpoints and/or processors specified in the load balancer list. In Camel 2.5 if endpoints do not match ratios, then a best effort distribution is attempted.

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Using Weighted round-robin & random load balancing

In Camel 2.5

An example using Java DSL:

Code Block

	java
	java

ArrayList<integer> distributionRatio = new ArrayList<integer>();
distributionRatio.add(4);
distributionRatio.add(2);
distributionRatio.add(1);

// round-robin
from("direct:start")
    .loadBalance().weighted(true, distributionRatio)
    .to("mock:x", "mock:y", "mock:z");

//random
from("direct:start")
    .loadBalance().weighted(false, distributionRatio)
    .to("mock:x", "mock:y", "mock:z");

And the same example using Spring XML:

Code Block

	xml
	xml

    <route>
      <from uri="direct:start"/>
      <loadBalance>
        <weighted roundRobin="false" distributionRatio="4 2 1"/>
          <to uri="mock:x"/>
          <to uri="mock:y"/>
          <to uri="mock:z"/>
      </loadBalance>
    </route>

As of Camel 2.6*

An example using Java DSL:

Code Block

	java
	java


// round-robin
from("direct:start")
    .loadBalance().weighted(true, "4:2:1")
    .to("mock:x", "mock:y", "mock:z");

//random
from("direct:start")
    .loadBalance().weighted(false, "4,2,1", ",")
    .to("mock:x", "mock:y", "mock:z");

And the same example using Spring XML:

Code Block

	xml
	xml

    <route>
      <from uri="direct:start"/>
      <loadBalance>
        <weighted roundRobin="false" distributionRatio="4,2,1" distributionRatioDelimiter="," />
          <to uri="mock:x"/>
          <to uri="mock:y"/>
          <to uri="mock:z"/>
      </loadBalance>
    </route>

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Child pages

Versions Compared

Old Version 21

New Version 22

Key

Using Weighted round-robin & random load balancing