Question

我正在尝试为Hazelcast集群编写单元测试- 根据这份文件 https://hazelcast.zendesk.com/hc/en-us/articles/115004425243-How-do-I-test-my-Hazelcast-cluster-

我以这种方式编写了我的代码-

public void test(){
    HazelcastInstance instance = Hazelcast.newHazelcastInstance(); 
    HazelcastInstance instance2 = Hazelcast.newHazelcastInstance();                
}

我的控制台显示-

Members [1] {
    Member [MY IP]:5701 -  this
}

和

Members [1] {
    Member [MY IP]:5702 - this
}

端口号更改，IP保持不变，但它们不在同一群集中。如何使它们成为同一群集的一部分（在单个JVM上）？更新

更多控制台数据-

Jul 31, 2018 3:21:00 PM com.hazelcast.config.XmlConfigLocator
INFO: Loading 'hazelcast-default.xml' from classpath.
Jul 31, 2018 3:21:01 PM com.hazelcast.instance.DefaultAddressPicker
INFO: [LOCAL] [dev] [3.7.4] Prefer IPv4 stack is true.
Jul 31, 2018 3:21:01 PM com.hazelcast.instance.DefaultAddressPicker
INFO: [LOCAL] [dev] [3.7.4] Picked [MY_IP]:5701, using socket     ServerSocket[addr=/0:0:0:0:0:0:0:0,localport=5701], bind any local is true
Jul 31, 2018 3:21:01 PM com.hazelcast.system
INFO: [MY_IP]:5701 [dev] [3.7.4] Hazelcast 3.7.4 (20161209 - 3df1bb5) starting at [MY_IP]:5701
Jul 31, 2018 3:21:01 PM com.hazelcast.system
INFO: [MY_IP]:5701 [dev] [3.7.4] Copyright (c) 2008-2016, Hazelcast, Inc. All Rights Reserved.
Jul 31, 2018 3:21:01 PM com.hazelcast.system
INFO: [MY_IP]:5701 [dev] [3.7.4] Configured Hazelcast Serialization version : 1
Jul 31, 2018 3:21:01 PM com.hazelcast.spi.impl.operationservice.impl.BackpressureRegulator
INFO: [MY_IP]:5701 [dev] [3.7.4] Backpressure is disabled
Jul 31, 2018 3:21:01 PM com.hazelcast.instance.Node
INFO: [MY_IP]:5701 [dev] [3.7.4] Creating MulticastJoiner
Jul 31, 2018 3:21:01 PM com.hazelcast.core.LifecycleService
INFO: [MY_IP]:5701 [dev] [3.7.4] [MY_IP]:5701 is STARTING
Jul 31, 2018 3:21:02 PM com.hazelcast.spi.impl.operationexecutor.impl.OperationExecutorImpl
INFO: [MY_IP]:5701 [dev] [3.7.4] Starting 4 partition threads
Jul 31, 2018 3:21:02 PM     com.hazelcast.spi.impl.operationexecutor.impl.OperationExecutorImpl
INFO: [MY_IP]:5701 [dev] [3.7.4] Starting 3 generic threads (1 dedicated for priority tasks)
Jul 31, 2018 3:21:02 PM com.hazelcast.nio.tcp.nonblocking.NonBlockingIOThreadingModel
INFO: [MY_IP]:5701 [dev] [3.7.4] TcpIpConnectionManager configured with Non Blocking IO-                    threading model: 3 input threads and 3 output threads
Jul 31, 2018 3:21:05 PM com.hazelcast.internal.cluster.impl.MulticastJoiner
INFO: [MY_IP]:5701 [dev] [3.7.4]



Members [1] {
    Member [MY_IP]:5701 - 
this
}

Jul 31, 2018 3:21:05 PM com.hazelcast.core.LifecycleService
INFO: [MY_IP]:5701 [dev] [3.7.4] [MY_IP]:5701 is 
STARTED
Jul 31, 2018 3:21:05 PM com.hazelcast.config.XmlConfigLocator
INFO: Loading 'hazelcast-default.xml' from classpath.
Jul 31, 2018 3:21:05 PM com.hazelcast.instance.DefaultAddressPicker
INFO: [LOCAL] [dev] [3.7.4] Prefer IPv4 stack is true.
Jul 31, 2018 3:21:05 PM com.hazelcast.instance.DefaultAddressPicker
INFO: [LOCAL] [dev] [3.7.4] Picked [MY_IP]:5702, using socket 
ServerSocket[addr=/0:0:0:0:0:0:0:0,localport=5702], bind any local is 
true
Jul 31, 2018 3:21:05 PM com.hazelcast.system
INFO: [MY_IP]:5702 [dev] [3.7.4] Hazelcast 3.7.4 (20161209 - 
3df1bb5) starting at [MY_IP]:5702
Jul 31, 2018 3:21:05 PM com.hazelcast.system
INFO: [MY_IP]:5702 [dev] [3.7.4] Copyright (c) 2008-2016, 
Hazelcast, Inc. All Rights Reserved.
Jul 31, 2018 3:21:05 PM com.hazelcast.system
INFO: [MY_IP]:5702 [dev] [3.7.4] Configured Hazelcast 
Serialization version : 1
Jul 31, 2018 3:21:05 PM 
com.hazelcast.spi.impl.operationservice.impl.BackpressureRegulator
INFO: [MY_IP]:5702 [dev] [3.7.4] Backpressure is disabled
Jul 31, 2018 3:21:05 PM com.hazelcast.instance.Node
INFO: [MY_IP]:5702 [dev] [3.7.4] Creating MulticastJoiner
Jul 31, 2018 3:21:05 PM com.hazelcast.core.LifecycleService
INFO: [MY_IP]:5702 [dev] [3.7.4] [MY_IP]:5702 is                     
Jul 31, 2018 3:21:05 PM 
com.hazelcast.spi.impl.operationexecutor.impl.OperationExecutorImpl
INFO: [MY_IP]:5702 [dev] [3.7.4] Starting 4 partition threads
Jul 31, 2018 3:21:05 PM 
com.hazelcast.spi.impl.operationexecutor.impl.OperationExecutorImpl
INFO: [MY_IP]:5702 [dev] [3.7.4] Starting 3 generic threads (1 
dedicated for priority tasks)
Jul 31, 2018 3:21:05 PM 
com.hazelcast.nio.tcp.nonblocking.NonBlockingIOThreadingModel
INFO: [MY_IP]:5702 [dev] [3.7.4] TcpIpConnectionManager 
configured with Non Blocking IO-threading model: 3 input threads and 3 
output threads
Jul 31, 2018 3:21:08 PM 
com.hazelcast.internal.cluster.impl.MulticastJoiner
INFO: [MY_IP]:5702 [dev] [3.7.4] 


Members [1] {
    Member [MY_IP]:5702 - 
this
}

Jul 31, 2018 3:21:08 PM com.hazelcast.instance.Node
WARNING: [MY_IP]:5702 [dev] [3.7.4] Config seed port is 5701 
and cluster size is 1. Some of the ports seem occupied!
Jul 31, 2018 3:21:08 PM com.hazelcast.core.LifecycleService
INFO: [MY_IP]:5702 [dev] [3.7.4] [MY_IP]:5702 is 
STARTED

Answer 1

如您所述，您正在使用默认的Hazelcast配置，如日志中所示

INFO: Loading 'hazelcast-default.xml' from classpath.

默认的Hazelcast配置用于多播。这是快速启动多台计算机的理想选择，而不是一台计算机那么好。

第一个Hazelcast.newHazelcastInstance()将在端口5701上启动多播组。

第二个Hazelcast.newHazelcastInstance()将发现正在使用的端口5701，将占用下一个端口5702，并在5702上启动多播组。

换句话说，第二个实例可以在同一端口上，因此不能在同一组中（因为该组基于端口）。因此，您最终得到了两个不需要的簇。

有四个步骤可以实现您想要的。

您在测试类路径中需要一个hazelcast.xml文件。
关闭多播
打开另一个发现，TCP距离这里最简单
（可选）不要使用3.7.4，它不是最新版本，请使用3.10.4

关闭多播不会打开TCP。您可以选择不进行发现（对某些测试有用）。

所以您需要一个看起来像这样的hazelcast.xml：

<?xml version="1.0" encoding="UTF-8"?>
<hazelcast xsi:schemaLocation="http://www.hazelcast.com/schema/config hazelcast-config-3.10.xsd"
       xmlns="http://www.hazelcast.com/schema/config"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">

  <network> 
    <join>  
      <multicast enabled="false"/>
      <tcp-ip enabled="true">
        <interface>127.0.0.1</interface>
      </tcp-ip>
    </join>
  </network>
</hazelcast>

Answer 2

对于单个JVM或同一台机器上的多个JVM中的多个实例，默认配置将正常工作。

错误Dim myTime = DateTime.Parse(Read24HFormatTime()) Dim name = "Emplyee" Console.WriteLine($"{vbCrLf}Hello, {name}, at {myTime:t}") Console.ReadKey(True)是 Red Herring 。

在同一台计算机上启动多个实例时，它将选择一个不同的端口。但是，以上错误确实表明您的实例之间存在通信问题。

如果没有通讯问题，您将在日志中看到不同的输出。辅助实例在启动时将输出类似这样的信息（注意它仍在使用5702）。

Config seed port is 5701 and cluster size is 1. Some of the ports seem occupied!

就我而言，解决此问题就像在本地计算机上禁用防火墙一样简单，因为我绑定了路由器分配的DHCP地址。如果绑定到回送地址，则需要确保OS上的回送可以正确地与多播一起使用。当通过环回接口使用多播时，OSX存在一些已知的Java问题。 https://bugs.java.com/bugdatabase/view_bug.do?bug_id=7122846

Answer 3

经历了这些事情之后： https://docs.hazelcast.org/docs/1.9/manual/html/ch16s02.html

我得出的结论是，我只需要一个更好的配置即可告诉Hazelcast将2个实例威胁为1个群集。

private val hazelcastOnNode1 = newHazelcastInstance("hazelcastInstance-cluster-node1")
private val hazelcastOnNode2 = newHazelcastInstance("hazelcastInstance-cluster-node2")

@BeforeAll
fun setupTest() {
    log.info("hazelcastOnNode1: ${hazelcastOnNode1.name} is part of a cluster: ${hazelcastOnNode1.cluster}")
    log.info("hazelcastOnNode2: ${hazelcastOnNode2.name} is part of a cluster: ${hazelcastOnNode2.cluster}")
}

private fun newHazelcastInstance(instanceName: String): HazelcastInstance {
    val cfg = Config()
    cfg.instanceName = instanceName
    cfg.groupConfig.name = "hazel-cluster"
    cfg.networkConfig.join.multicastConfig.isEnabled = false
    cfg.networkConfig.join.tcpIpConfig.isEnabled = true
    cfg.networkConfig.join.tcpIpConfig.members = listOf("127.0.0.1")
    return Hazelcast.newHazelcastInstance(cfg)
}

同一台计算机上有多个Hazelcast实例？

3 个答案: