关于Dubbo服务负载均衡策略

1. Dubbo中LoadBanace 关系

2.  负载均衡策略

2.1 随机算法

默认条件下就是随机算法

package com.alibaba.dubbo.rpc.cluster.loadbalance;

public class RandomLoadBalance extends com.alibaba.dubbo.rpc.cluster.loadbalance.AbstractLoadBalance {
    public static final java.lang.String NAME = "random";
    private final java.util.Random random;

    public RandomLoadBalance() { /* compiled code */ }

    protected <T> com.alibaba.dubbo.rpc.Invoker<T> doSelect(java.util.List<com.alibaba.dubbo.rpc.Invoker<T>> invokers, com.alibaba.dubbo.common.URL url, com.alibaba.dubbo.rpc.Invocation invocation) { /* compiled code */ }
}
           

2.2 最少使用算法

package com.alibaba.dubbo.rpc.cluster.loadbalance;

public class LeastActiveLoadBalance extends com.alibaba.dubbo.rpc.cluster.loadbalance.AbstractLoadBalance {
    public static final java.lang.String NAME = "leastactive";
    private final java.util.Random random;

    public LeastActiveLoadBalance() { /* compiled code */ }

    protected <T> com.alibaba.dubbo.rpc.Invoker<T> doSelect(java.util.List<com.alibaba.dubbo.rpc.Invoker<T>> invokers, com.alibaba.dubbo.common.URL url, com.alibaba.dubbo.rpc.Invocation invocation) { /* compiled code */ }
}
           

2.3 轮循算法

package com.alibaba.dubbo.rpc.cluster.loadbalance;

public class RoundRobinLoadBalance extends com.alibaba.dubbo.rpc.cluster.loadbalance.AbstractLoadBalance {
    public static final java.lang.String NAME = "roundrobin";
    private final java.util.concurrent.ConcurrentMap<java.lang.String,com.alibaba.dubbo.common.utils.AtomicPositiveInteger> sequences;

    public RoundRobinLoadBalance() { /* compiled code */ }

    protected <T> com.alibaba.dubbo.rpc.Invoker<T> doSelect(java.util.List<com.alibaba.dubbo.rpc.Invoker<T>> invokers, com.alibaba.dubbo.common.URL url, com.alibaba.dubbo.rpc.Invocation invocation) { /* compiled code */ }

    private static final class IntegerWrapper {
        private int value;

        public IntegerWrapper(int value) { /* compiled code */ }

        public int getValue() { /* compiled code */ }

        public void setValue(int value) { /* compiled code */ }

        public void decrement() { /* compiled code */ }
    }
}
           

2.4 Hash一致性算法

package com.alibaba.dubbo.rpc.cluster.loadbalance;

public class ConsistentHashLoadBalance extends com.alibaba.dubbo.rpc.cluster.loadbalance.AbstractLoadBalance {
    private final java.util.concurrent.ConcurrentMap<java.lang.String,com.alibaba.dubbo.rpc.cluster.loadbalance.ConsistentHashLoadBalance.ConsistentHashSelector<?>> selectors;

    public ConsistentHashLoadBalance() { /* compiled code */ }

    protected <T> com.alibaba.dubbo.rpc.Invoker<T> doSelect(java.util.List<com.alibaba.dubbo.rpc.Invoker<T>> invokers, com.alibaba.dubbo.common.URL url, com.alibaba.dubbo.rpc.Invocation invocation) { /* compiled code */ }

    private static final class ConsistentHashSelector <T> {
        private final java.util.TreeMap<java.lang.Long,com.alibaba.dubbo.rpc.Invoker<T>> virtualInvokers;
        private final int replicaNumber;
        private final int identityHashCode;
        private final int[] argumentIndex;

        ConsistentHashSelector(java.util.List<com.alibaba.dubbo.rpc.Invoker<T>> invokers, java.lang.String methodName, int identityHashCode) { /* compiled code */ }

        public com.alibaba.dubbo.rpc.Invoker<T> select(com.alibaba.dubbo.rpc.Invocation invocation) { /* compiled code */ }

        private java.lang.String toKey(java.lang.Object[] args) { /* compiled code */ }

        private com.alibaba.dubbo.rpc.Invoker<T> selectForKey(long hash) { /* compiled code */ }

        private long hash(byte[] digest, int number) { /* compiled code */ }

        private byte[] md5(java.lang.String value) { /* compiled code */ }
    }
}