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Questions tagged [hazelcast]

Hazelcast is an open source In-Memory Data Grid platform. The architecture supports high scalability and data distribution in a clustered environment. It supports auto-discovery of nodes and intelligent synchronization.

Hazelcast is an open source In-Memory Data Grid platform. The architecture supports high scalability and data distribution in a clustered environment.

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How can I check if a hazelcast cluster is alive from a java client?

We use hazelcast in client-server mode. The hazelcast cluster contains 2 hazelcast nodes and we have about 25 clients connected to the cluster. What I am lookin for now is a simple check that tries to figure out if the cluster is still alive. It…
u6f6o
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purpose of auto increment flag in hazelcast config

I am not completely certain about the purpose for the auto-increment flag in the hazelcast xml config file. When I have that turned off, I see multiple exceptions in my server instance complaining about port not being open (already in use) for port…
user3813256
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Performance drop upgrading from Hazelcast 2.5 to 3+

Because of a known (fixed) bug in Hazelcast 2.5 we've decided this would be the next upgrade candidate for our project. But after dropping in the latest version (3.2.2) we had horrible performance. The way we are using Hazelcast: Two nodes Multiple…
Roy van Rijn
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Redis vs Memcahced vs Hazelcast

I'm looking for an in-memory database used to simply record metrics of read and writes done on parts of a database so that I know which queries are executed most often. I also want this in-memory database to be distributed over nodes, as is the main…
Ree
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Hazelcast single node fast startup for debugging

I'm writing an app that uses Hazelcast. My app is really slow to start because Hazelcast tries to talk to other nodes on the network on startup. This is fine for production, but when I'm doing single-node debugging it really slows down my…
ccleve
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any benefit from using Hazelcast instead of MongoDB to store user sessions/keys?

We are running mongodb instance to store data in a collections, no problems with it and mongo is our main data storage. Today, we are going to develop Oauth2 support for the product and have to store the user sessions (security key, access token…
IgorA
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Hazelcast Queue Info

I am currently writing a distributed system using hazelcast. I have a few questions regarding Queues implemented using hazelcast. What is the best way to process data from the Queue? I currently have threads on each "node" reading off the blocking…
Paul
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Is there a way to allow Delphi applications to use Hazelcast?

Is there any way for a Delphi application to use the distributed cache from Hazelcast?
Rodrigo Farias Rezino
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ClassCastException with Stacktrace Hazelcast version 4.2.5 using ReplicatedMap

Using Hazelcast version 4.2.5 in a webapp deployed on Tomcat on Kubernetes. We're frequently("every 5 seconds") seeing ClassCastException with a stacktrace in the application logs. Here's the ClassCastException : java.lang.ClassCastException: class…
anjanb
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Hibernate lazy loading and Hazelcast

we are using Hazelcast as Hibernate 2nd level cache now for a while but are recognizing long delays in storing and reading data when using more than one node. We make intensive use of composed objects and @OneToMany relations, and to increase …
Andreas
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Apache Ignite vs redis cluster(use partition) vs other solution

Hi I looking for In memory data grid or similar one. My use case. Data griding in memory. scale out available. backup node available. persistent backup available. (optional) free or opensource solution I did googling and I found candidates below -…
moon
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How do I configure Vert.x event bus to work across cluster of Docker containers?

In my current setup, I'm using the default multicast option of the Hazelcast cluster manager. When I link the instances of my containerized Vertx modules (via Docker networking links), I can see that they are successfully creating Hazelcast cluster.…
Psycho Punch
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Hazelcast: Merge two hazelcast instances

Lets say we have two instances of hazelcast: HazelcastInstance firstInstance = Hazelcast.newHazelcastInstance(new Config()); HazelcastInstance secondInstance = Hazelcast.newHazelcastInstance(new Config()); // Add entries to firstInstance // Add…
RDM
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Discovering Hazelcast instance in a Spring Boot eco-system

Background: We have a set of about 15 Spring Boot applications as microservices. They all run as Docker containers, and run as clusters of one or more instances. We also use Spring Cloud Netflix components such as Eureka and discover the running…
Kartik Pandya
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Hazelcast spring configuration

Whats the difference between tag created in the applicationContext vs the one that is defined in the segment? How are they related? I am aware that in applicationContext would result in creation of a bean of type IMap…
Manish
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