From what I have seen the applications of Hazelcast are most commonly found in architectures with more than 50 nodes. Does it makes sense to use Hazelcast on a 1 up to a 4 node architecture? If yes...

How can I configure Hazelcast (optimally the version I currently use: 3.1.2) to run 2 hazelcast instances on a single machine, and block the first instance during startup until both instances are p...

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-me...

I am using Hazelcast v2.5. I have a few doubts related to partitioning in a cluster. How are the partitions identified ? When a m.get request is made how does Hazelcast identify in which partitio...

I would like to know how the Hazelcast autodiscovery works. How do nodes find other nodes in the network? And how do they know when a node is dead?

How to run hazelcast server as a linux service in production environments ? java -server -cp hazelcast.jar com.hazelcast.examples.StartServer StartServer runs the server with outputs to std term...

How do you programmatically configure hazelcast for the multicast discovery mechanism? Details: The documentation only supplies an example for TCP/IP and is out-of-date: it uses Config.setPort...

We are currently running a distributed Java application connected by a set of JMS queues (no topics). The Java application makes heavy use of the Apache Camel framework, which is also used to...

My Java code started numbers of Hazelcast instances in the same JVM (but they are in the same group). Now I want to shut down some of instances, but not all of them. I know the method Hazelcast.s...

We have a JAVA web app which uses postgres(single database with a slave) for storing all the important data. We are now moving from a single server setup to mutiple servers due to which i need to...

I just went through the hazelcast documentation. It suggests that data partitioned across all the nodes. And the number of partitions created in cluster 271 by default ! What parameters govern...

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 sing...

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 s...

I wonder if I can do request-reply with this: 1 hazelcast instance/member (central point) 1 application with hazelcast-client sending request through a queue 1 application with hazelcast-client w...

I want to share a very large object e.g. in orders of megabytes or even several gigabytes, between a set of machines. The object will be written once but may be read many times. Maybe a naive appro...

I'm developing high-scalable application, so I decided to use Hazelcast for it. I have one frontend server, which puts messages for nodes. Every node in cluster change it's workload in background t...

We are using Hazelcast 2.3.1, in our hazelcast.xml configuration file we use write behind for an Hazelcast IMap: <map name="HazelcastObjectOperations.objectMap"> <backup-count>1</...

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 ...

Is there any way for a Delphi application to use the distributed cache from Hazelcast?

I am trying to work out how to develop a reasonably scalable batch-processing framework for a webapp I am writing. I am using Spring MVC for the webapp, with a custom DAO layer (to access the data...

Currently we have 2 app severs, each has application level cache and has centralized database server. To keep both servers app cache in sync we have set up JMS broker in between. On cache clear on ...

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 ob...

Is there a way to programmatically set the "time to live" property (or in fact, any property) for a distributed map in Hazelcast? I want to avoid having to change the Hazelcast config XML for this...