Question

I have a Hazelcast cluster formed of 2 full members and a Lite member, multicast enabled. I want to connect multiple Hazelcast (.NET) clients exclusively to the Hazelcast Lite member. The thing is that even if I configure the address and port of this Lite member on the client side I still see connections from the client to the other 2 Hazelcast full cluster members:

<hazelcast-client>
    <network>
        <cluster-members>
            <address>10.28.0.106:5701</address>
        </cluster-members>
    </network>
    ...
</hazelcast-client>

Can this be done?

The idea is to have the Lite member store a large amount of mostly read-only data (near-client will be enabled on the Lite member) and will be running on the same machine as the clients so the access will be much faster than client->cluster connections.

Let's ignore the fact that this Lite member becomes a single point of failure here, the system as whole won't be impacted.

Answer 1

如果在客户端将智能路由设置为false并且仅在客户端配置lite成员，则客户端将仅连接到lite成员。见http://docs.hazelcast.org/docs/3.6/manual/html-single/index.html#setting-smart-routing

但是当该成员死亡时，客户端将连接到其他节点之一。如果您希望客户端在与lite成员断开连接时关闭，则可以在客户端使用生命周期监听器。当您看到LifecycleEvent.LifecycleState.CLIENT_DISCONNECTED事件时，调用hazelcastClient.shutdown（）。

Answer 2

我认为您可以将GroupConfig用于此目的。来自JavaDoc：

使用群组可以创建多个群集，其中每个群集都有自己的群组，并且不会干扰其他群集。

您应该为客户声明组配置（2次 - 对于Lite会员和正式会员）以及Lite＆amp;相应的正式成员。

<group>
    <name>liteGroup</name>
    <password>pswd1</password>
<group>
<group>
    <name>fullGroup</name>
    <password>pswd2</password>
<group>

查看Group Config Doc

如果您有任何疑问，请随时与我联系。

Hazelcast: can I configure a hazelcast client to connect only to a single lite member of the cluster?

2 个答案: