hazelcast

问题 Currently I have three instances registered in the CPSubsystem . ----- | I1* | * Leader ----- ---- ---- | I2 | | I3 | ---- ---- When all instances are up an running, all registered and seeing each other on the CPSubsystem everything is working as expected. The following call is used to perform distributed locks between all the instances: getHazelcastInstance().getCpSubsystem().getLock(lockDefinition.getLockEntryName()) I noticed an issue when two of these instances die, and there is no leader

问题 We have a spring boot application running in physical boxes. Planning to migrate to EKS (AWS). We have hazelcast used for multiple purposes listed below. Is it possible to use hazelcast itself in AWS to make use of the same features.? Or should I used any other technology than using hazelcast itself ? Hazelcast is used for: 1. Master Election (of machines) 2. Caching (To keep some files sometimes and mainly to websocket messages and to transmit those whenever required) Master Election : It is

问题 We are currently using Hazelcast 3.1.5. I have a simple distributed locking mechanism that is supposed to provide thread safety across multiple JVM nodes. Code is pretty simple. private static HazelcastInstance hInst = getHazelcastInstance(); private IMap<String, Integer> mapOfLocks = null; ... ... mapOfLocks = hInst.getMap("mapOfLocks"); if (mapOfLocks.get(name) == null) { mapOfLocks.put(name,1); mapOfLocks.lock(name); } else { mapOfLocks.put(name,mapOfLocks.get(name)+1); } ... <STUFF

问题 For sharing events between the pods of two different services in a Kubernetes namespace, I intend to use Hazelcast. This is not a problem, however, each service also has a cluster that contains all its pods. So, I have two clusters using the same pods. I achieved separation of the clusters by setting a group name for one of the clusters, while the other has the default group configuration. This works fine locally, with multiple instances of a test application. However, this is with multicast

问题 When I am trying to connect Hazelcast server through client, it gives me following exeption. com.hazelcast.client.AuthenticationException: Invalid credentials! at com.hazelcast.client.spi.impl.ClusterListenerSupport$ManagerAuthenticator.authenticate(ClusterListenerSupport.java:153) at com.hazelcast.client.connection.nio.ClientConnectionManagerImpl.authenticate(ClientConnectionManagerImpl.java:249) at com.hazelcast.client.connection.nio.ClientConnectionManagerImpl.initializeConnection

问题 The context Two nodes of a Hazelcast cluster, each on a discrete subnet so multicast is not suitable nor working for node location. I should like to employ the most minimal XML configuration file, say hazelcast.xml , to configure Hazelcast to use TCP/IP to connect the two nodes. Ideally a directory of the IP addresses of the two nodes. The question The Hazelcast docs do a good job of showing how this can be achieved programatically, and how hazelcast.jar/hazelcast-default.xml holds the

问题 The context Two nodes of a Hazelcast cluster, each on a discrete subnet so multicast is not suitable nor working for node location. I should like to employ the most minimal XML configuration file, say hazelcast.xml , to configure Hazelcast to use TCP/IP to connect the two nodes. Ideally a directory of the IP addresses of the two nodes. The question The Hazelcast docs do a good job of showing how this can be achieved programatically, and how hazelcast.jar/hazelcast-default.xml holds the

问题 I am a newbie for Hazelcast. I would like to know how can I list current lock in Hazelcast console? For ex. assume that i open three console and i have taken 3 lock as follow: m.lock object1 m.lock object2 m.lock object3 How can i get output like: number of lock site: 3 locks: object1, object2, object3 回答1: Console is just a test app to simulate basic functionalities of hazelcast. To see your lock instances following code will help you. HazelcastInstance hzInstance = Hazelcast

问题 I need to set up Hazelcast session caching using Spring. Using the configuration from the hazelcast docs is simple. However, its insufficient. I need to use a different configuration file for each one of my environments (DEV, QA, PROD). Alternatively (Ideally), I would like to use several properties from a spring bean that would be set during the initialization of the spring container. According to the hazelcast documentation, all I need to do set a group for each of my environments. like so:

问题 I am currently struggling with the following problem: I have a Java EE application that shall be able to run in a cluster (it actually does). For the data exchange between the nodes I use Hazelcast 3.3.3. Since our customers are afraid of UDP we use TCP. So I configure 3 hazelcast parameters per node: The network interface to use, the port and the members of the cluster. In real life (not a docker environment) everything works. Now I want to put my Java EE servers into docker containers (one