cluster-computing

问题 I am following "A cluster on a single machine" explained in https://www.rabbitmq.com/clustering.html but it is not working as it is. I am using ubuntu 14.04 64 bit. root@sunny-workstation:~# RABBITMQ_NODE_PORT=5673 RABBITMQ_SERVER_START_ARGS="- rabbitmq_management listener [{port,15673}]" RABBITMQ_NODENAME=hare rabbitmq-server & [1] 17990 root@sunny-workstation:~# RabbitMQ 3.2.4. Copyright (C) 2007-2013 GoPivotal, Inc. ## ## Licensed under the MPL. See http://www.rabbitmq.com/ ## ## #########

问题 I am trying to test my software behavior during cluster failover, and for that reason I want to configure a simplest cluster: one master and two slaves. I have tree files 7000.conf - 7002.conf of the following content: port 7000 cluster-config-file nodes.7000.conf appendfilename appendonly.7000.aof dbfilename dump.7000.rdb pidfile /var/run/redis_7000.pid include cluster.conf The content of cluster.conf : cluster-enabled yes appendonly yes maxclients 100 daemonize yes cluster-node-timeout 2000

问题 I run H2 in cluster mode with 2 nodes. I have two tables. A parent, and a child. The child contains a foreign key to the ID of a row of the parent table. I'm experiencing a weird issue that I can not understand : everything is working OK until I violate a unique constraint. Steps: - Everything is working normally - I violate (by purpose here) a Unique constraint - Now when adding child rows, I get a referential integrity violation on the foreign key (parent.id), but the child row is properly

问题 Suppose I created a JMS Topic (PropertiesTopic) with one subscriber (PropertiesSubscriber). PropertiesSubscriber is running in a load balanced application server cluster as shown in the picture below. alt text http://www.freeimagehosting.net/uploads/be28c03781.png When a message is delivered to PropertiesTopic, do all the instances of PropertiesSubscriber running on different app servers get that message or does the message get delivered to only one PropertiesSubscriber instance running on an

问题 I've built a cluster on Glassfish administred via SSH, where there are 2 instances. I deployed an application that shows the "Session id". This application has in the web.config: <distributable/> And in the sun-web.xml: <session-config> <cookie-properties> <property name="cookieDomain" value="compute.amazonaws.com"/> </cookie-properties> </session-config> I enabled "Availability" in Edit Application. But when I access the 2 web app versions I see different session ids. Can anyone help me?

问题 Can someone point me to the Akka version that has the package akka.cloud.cluster? I am currently using Akka 1.2-RC6. google searches on this topic result in broken links about Cloudy Akka... 回答1: Cloudy Akka was described here as a suite of commercial add-on modules for Akka. The original company developing Akka have since merged with Typesafe. The latest seems to be this topic from the akka user mailing list, specifically: "the Cloudy Akka project is split up: the stuff interesting for

问题 I am new to Whirr and I'm trying to setup a Hadoop cluster on EC2 with Whirr,I have followed the tutorial on Cloudera https://ccp.cloudera.com/display/CDHDOC/Whirr+Installation Before install Whirr, I install Hadoop (0.20.2-cdh3u3), then install Whirr (0.5.0-cdh3u3). Here's my cluster config file whirr.cluster-name=large-cluster whirr.instance-templates=1 hadoop-jobtracker+hadoop-namenode,1 hadoop-datanode+hadoop-tasktracker whirr.provider=aws-ec2 whirr.identity=XXXXXXXXXXXXXXX whirr

问题 I'm trying to set up a fully-distributed 4-node dev cluster with Hadoop 2.20 and HBase 0.98 on Windows. I've built Hadoop on Windows successfully, and more recently, also build HBase on Windows. We have successfully ran the wordcount example from the Hadoop installation guide, as well as a custom WebHDFS job. As HBase fully-distributed on Windows isn't supported yet, I'm running HBase under cygwin. When trying to start hbase from my master (./bin/start-hbase.sh), I get the following error:

问题 I have read over this article pretty thoroughly and as well have spent a few hours researching the subject of clustering (forking processes) in Node.js. What I can't seem to understand from the article, is what determines which worker process gets request X, if they are all listening on the same port? Is there a way for the master process to channel the requests, or is it just random? 回答1: There a good explanation here. Long story short, there are 2 different behaviors depending on your node

问题 I'm working on 1-1 chat rooms application powered by node.js + express + socket.io. I am following the article: Socket.IO - Rooms and Namespaces In the article they demonstrate how to initiate the io.adapter using the module socket.io-redis : var io = require('socket.io')(3000); var redis = require('socket.io-redis'); io.adapter(redis({ host: 'localhost', port: 6379 })); Two questions: In the docs, They are mentioning two more arguments: pubClient and subClient . Should I supply them? What's