hazelcast

Hazelcast NearCache doesn't have the expected effect on performance

阅读更多关于 Hazelcast NearCache doesn't have the expected effect on performance

问题 We have an application running on 1 or 2 nodes, depending on the environment, with a shared cache based on Hazelcast. One of the requests on the application triggers about 1000 requests on this cache (all cache hits). In a single node configuration this works nicely. Specifically each request takes less then 10ms. But if we use 2 nodes, each cache request takes about 20-200ms. We thought this would be due to Hazelcast getting the data from the remote node, which of course involves network

Hazelcast - OperationTimeoutException

阅读更多关于 Hazelcast - OperationTimeoutException

问题 I am using Hazelcast version 3.3.1. I have a 9 node cluster running on aws using c3.2xlarge servers. I am using a distributed executor service and a distributed map. Distributed executor service uses a single thread. Distributed map is configured with no replication and no near-cache and stores about 1 million objects of size 1-2kb using Kryo serializer. My use case goes as follow: All 9 nodes constantly execute a synchronous remote operation on the distributed executor service and generate

Can a Hazelcast ExecutorService be created to execute on a subset of the cluster?

阅读更多关于 Can a Hazelcast ExecutorService be created to execute on a subset of the cluster?

问题 I'm trying to setup a distributed executor service with hazelcast for my project. Some tasks which will run can only be completed on machines with OS specific utilities. Is there a way to submit a task that will run once on a subset of the cluster? Or to register that it should be used with a specific executor service? Looking at the API there are a number of options to submit a task, but all the options for submitting to multiple members will run the task on all of those members, not one of

Hazelcast performing slower

阅读更多关于 Hazelcast performing slower

问题 We are trying to use Hazelcast as distributed cache in our application. Here is our config: <hazelcast xsi:schemaLocation="http://www.hazelcast.com/schema/config hazelcast-config-3.7.xsd" xmlns="http://www.hazelcast.com/schema/config" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> <group> <name>sample_dev</name> <password>dev@123</password> </group> <management-center enabled="false">http://localhost:8080/mancenter</management-center> <properties> <property name="hazelcast.logging

com.hazelcast.nio.serialization.HazelcastSerializationException

阅读更多关于 com.hazelcast.nio.serialization.HazelcastSerializationException

问题 Am running a OSGI plugin project (with N no of bundles), I have integrated hazel cast in it, i. When I try to add the data as map of string and test bean, It is getting added in hazel cast map but ! ii. When I try to get the map, Its showing an error as follows, com.hazelcast.nio.serialization.HazelcastSerializationException : java.lang. ClassNotFoundException : com.test.Data cannot be found by com.eclipsesource.jaxrs.jersey-all_2.10.1.SR1 FULL STACK TRACE com.hazelcast.nio.serialization

Hazelcast MapStoreConfig ignored

阅读更多关于 Hazelcast MapStoreConfig ignored

问题 I'm using a map store to persist my hazelcast distributed map in a database. In my test case, I start three hazelcast instances, each configured the same way: Config cfg = new Config(); cfg.setInstanceName("name"); hazelcast = Hazelcast.newHazelcastInstance(cfg); MapConfig mapConfig = new MapConfig("myMapName"); MapStoreConfig mapStoreConfig = new MapStoreConfig(); mapStoreConfig.setClassName(MyMapStore.class.getName()); mapStoreConfig.setWriteDelaySeconds(0); mapStoreConfig.setEnabled(true);

整理下工作学习的东西

阅读更多关于整理下工作学习的东西

Spring 全家桶 Elastaicsearch RocketMQ Nginx Tengine WAF JWT/AUTH2 Gateway ZipKin Mycat ELK Redis Dubbo Zookeeper Hazelcast 后续继续补充................... 来源： oschina 链接： https://my.oschina.net/hp2017/blog/3141311

阅读更多关于 HAZELCAST

1.1Hazelcast概述 Hazelcast是基于内存的数据网格开源项目，同时也是该公司的名称。Hazelcast提供弹性可扩展的分布式内存计算，Hazelcast被公认是提高应用程序性能和扩展性最好的方案。Hazelcast通过开放源码的方式提供以上服务。更重要的是，Hazelcast通过提供对开发者友好的Map、Queue、ExecutorService、Lock和JCache接口使分布式计算变得更加简单。例如，Map接口提供了内存中的键值存储，这在开发人员友好性和开发人员生产力方面提供了NoSQL的许多优点。除了在内存中存储数据外，Hazelcast还提供了一组方便的api来访问集群中的cpu，以获得最大的处理速度。轻量化和简单易用是Hazelcast的设计目标。Hazelcast以Jar包的方式发布，因此除Java语言外Hazelcast没有任何依赖。Hazelcast可以轻松地内嵌已有的项目或应用中，并提供分布式数据结构和分布式计算工具。 Hazelcast 具有高可扩展性和高可用性（100%可用，从不失败）。分布式应用程序可以使用Hazelcast进行分布式缓存、同步、集群、处理、发布/订阅消息等。Hazelcast基于Java实现，并提供C/C++，.NET，REST，Python、Go和Node.js客户端。Hazelcast遵守内存缓存协议

get returns a value of the superclass ArrayList in hazelcast 3.5

阅读更多关于 get returns a value of the superclass ArrayList in hazelcast 3.5

问题 I have a serialization problem with hazelcast 3.5: When one hazelcast client(Java) puts a value of class public class MyType extends ArrayList<MyElem> into a map, and afterwards another client (other Java process) retrieves the value, it gets back a value of class ArrayList , not the expected subclass MyType ! In hazelcast version 3.1.3 this worked fine: the second client retrieved a value of the correct subclass MyType . I used the sample configuration hazelcast.xml and the start script

Hazelcast's Web session clustering

阅读更多关于 Hazelcast's Web session clustering

问题 We are currently exploring the usage of Hazelcast's session clustering capabilities and have immediately run into a weird issue. All the Struts expressions in our jsp pages are "lost" and instead we just find empty string in their place. i.e. an expression as the following <span class="status" data-title="${statusName}"></span> just becomes <span class="status" data-title=""></span> Removing the hazelcast filters, the pages work fine. Our web.xml is not fancy and just has the the hazelcast