CODEWITHSUNDEEP
rabbitmqhigh-availabilityfailoverfailovercluster
sharman
sharman

Reputation: 535

Rabbitmq HA synchronization

I am trying to tune a 3 node rabbitmq cluster (don't have a separate load balancer in the configuration) by setting ha-sync-batch-size. After playing around with it I am observing that the latency of the failover seems to actually increase with the batch size setting set. It seems that the default value (every message) works better with faster switchover to a new master node. Is this the general observation or are there other considerations for setting the batch size?
To test I am using a load tester with 20-50 concurrent users. And shut down one node at a time starting with the master node. Typically, a few messages error out and then the new master node kicks in. Is there a better way of reducing the window for the new master node election? Any feedback would be appreciated.

Upvotes: 0

Views: 665

Answers (1)

sharman
sharman

Reputation: 535

I think I found an answer. I failed to post that I am using RabbitTemplate. I wired a RetryTemplate into it as follows:

public @Bean RabbitTemplate templateFactory(){
    log.debug("Creating an template  factory.....");
    RabbitTemplate r=new RabbitTemplate(connectionFactory);
    r.setExchange(rabbitExchange);
    r.setRoutingKey(rabbitBinding);
    r.setRetryTemplate(retryTemplate());
    return r;
}

@Bean RetryTemplate retryTemplate(){
    RetryTemplate retryTemplate = new RetryTemplate();
    ExponentialBackOffPolicy backOffPolicy = new ExponentialBackOffPolicy();
    backOffPolicy.setInitialInterval(500);
    backOffPolicy.setMultiplier(10.0);
    backOffPolicy.setMaxInterval(5000);
    retryTemplate.setBackOffPolicy(backOffPolicy);
    SimpleRetryPolicy policy=new SimpleRetryPolicy();
    policy.setMaxAttempts(3);

    retryTemplate.setRetryPolicy(policy);
    return retryTemplate;
}

And, spring quite reliably retries (3 times in this case) enough number of times to send the request through. If anybody has a better idea please post. Thanks

Upvotes: 0

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