hazelcast

how to create hazelcast instance

由 久未见 提交于 2019-12-23 17:27:46
问题 I am using hazelcast using the client and server setup (not peer to peer). Should I create an instance of hazelcast client and instance using a singleton pattern (I am using lazy idiom which probably needs another look in any case). Should I use a singleton or just call HazelcastInstance hz = Hazelcast . newHazelcastInstance (); to get an instance whenever I need one? Hazelcast accessor used in server implementation: public class HCastAccessor { private static final Logger Logger =

Microservices Architecture for highly frequent data access; in memory solutions?

由 不羁的心 提交于 2019-12-23 04:28:51
问题 let us define the following use case : There has to be a simulation task fulfilled, which involves an iteration/simulation over [ day1, day2, ..., dayN ]. Every step of the iteration depends on the prior step, so the order is predefined. The task has a state represented by Object1 , this object is going to be changed within every step of the iteration. The step of an iteration involves 2 different tasks: Task1 and Task2 . To fulfill Task1 , data from Database1 is required. For Task2 to be

Hazelcast Spring integration issue

由 时光怂恿深爱的人放手 提交于 2019-12-23 02:57:16
问题 I am integrating Hazelcast and Spring. Its giving me error regarding the Schema. Checked the spring and hazelcast version, still not sure why. Spring Version : 3.2.8 HazelCast Version : 3.5 My applicationContext: <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:hz="http://www.hazelcast.com/schema/spring" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema

No DataSerializeFactory registered for namespace

由 放肆的年华 提交于 2019-12-22 18:29:18
问题 I tried it in HZ 3.4 and 3.4.1 but with the same output I`m trying to import dummy data to my Hazelcast cluster, with following function HazelcastInstance cluster = HazelcastClient.newHazelcastClient(this.conf); Map<String, Customer> mapCustomers = cluster.getMap("customers"); System.out.println(mapCustomers.size()); System.out.println("hello world"); for (int customerID = 0; customerID < 2000; customerID++) { Customer p = new Customer(); mapCustomers.put(Integer.toString(customerID), p);

How to use Hazelcast's CPSubsystem with fewer than 3 nodes?

由 纵然是瞬间 提交于 2019-12-22 17:44:10
问题 I see that Hazelcast 3.12 has introduced the CPSubsystem() for systems with 3-7 nodes. I understand the reasoning. However, if I am trying to design a solution that can run with anywhere between 1-n nodes, do I need to use different logic to validate if the CPSubsystem is enabled? How do I even check that? I would have thought/hoped that simply calling hazelcastInstance.getCPSubsystem().getLock() would work no matter the number of nodes, but if there are fewer than 3 nodes, it throws an

Hazelcast map synchronization

由 柔情痞子 提交于 2019-12-22 08:46:23
问题 I am trying to implement distributed cache using Hazelcast in my application. I am using Hazelcast’s IMap . The problem I have is every time I get a value from a map and update the value, I need to do a put(key, value) again. If my value object has 10 properties and I have to update all 10, then I have to call put(key, value) 10 times. Something like - IMap<Integer, Employee> mapEmployees = hz.getMap("employees"); Employee emp1 = mapEmployees.get(100); emp1.setAge(30); mapEmployees.put(100,

Hazelcast single node fast startup for debugging

由 ￡可爱￡侵袭症＋ 提交于 2019-12-22 05:37:09
问题 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 edit-compile-run-debug cycle. Is there a Hazelcast setting that tells it that there's only one node so please start quickly and don't bother pinging the rest of the network? 回答1: You can disable join methods: <join> <multicast enabled="false"> </multicast>

Spring支持的CacheManager

由 天涯浪子 提交于 2019-12-21 15:26:01
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 数据缓存 Cache 为何要用缓存、缓存的目的是为了什么？ 我们知道一个程序的瓶颈在于数据库，内存的速度远远大于硬盘的速度，当我们一次又一次 请求数据库或远程服务时会导致大量的时间耗费在数据库操作或远程方法调用上，以致于 程序性能恶化，使用数据缓存可以解决此问题 属性 描述 SimpleCacheManager 使用简单的Collection来存储缓存，主要用来测试用途 ConcurrentMapCacheManager 使用ConcurrentMap来存储缓存 NoOpCacheManager 仅测试用途，不会实际存储缓存 EhCacheCacheManger 使用EhCache作为缓存技术 GuavaCacheManager 使用Google Guava的GuavaCache作为缓存技术 HazelcastCacheManager 使用Hazelcast作为缓存技术 JCacheCacheManager 支持JCache（JSR-107）标准的实现作为缓存技术 RedisCacheManager 使用Redis作为缓存技术 缓存注解式 注解 描述 @Cacheable 在方法执行前Spring先查看缓存中是否有数据，如果有数据则直接返回缓存 数据。反之调用方法并将方法返回值放入缓存填充。 @CachePut

Hazelcast dedicated nodes

由 三世轮回 提交于 2019-12-21 12:14:59
问题 What is the simplest way to run Hazelcast nodes on dedicated servers? We have a web application that uses a Hazelcast distributed map. Currently the Hazelcast nodes are configured to run in the Servlet Container nodes. As we scale up, we'd like to add dedicated hardware as Hazelcast nodes. Then we won't need full Hazelcast nodes in the Servlet Containers anymore, those can be clients. (There are licensing costs associated with the Servlet Containers, so getting load off them is good, don't

Hazelcast vs. Ignite benchmark

由 Deadly 提交于 2019-12-21 07:34:43
问题 I am using data grids as my primary "database". I noticed a drastic difference between Hazelcast and Ignite query performance. I optimized my data grid usage by the proper custom serialization and indexes, but the difference is still noticeable IMO. Since no one asked it here, I am going to answer my own question for all future references. This is not an abstract (learning) exercise, but a real-world benchmark, that models my data grid usage in large SaaS systems - primarily to display sorted
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