cluster-computing

问题 I'm trying to add a single node to an already existing cluster called ClusterA. Prior to bootstrapping this node, it was running a single node cassandra cluster called "Test" with an older version 0.7.4. ClusterA is running 0.7.5 and I've upgraded the node to be added to 0.7.5 as well. I configured the yaml properly, but when I run Cassandra I get spammed with the following: INFO 20:04:24,262 Logging initialized INFO 20:04:24,275 Heap size: 5156896768/5156896768 INFO 20:04:24,276 JNA not

问题 I am having a peculiar problem, I have an ear application containing ejb jars running on websphere 7 standalone. I downloaded version 8.5 trial, created a vertical cluster and installed the application on it. But the application is just not starting on version 8.5. Everytime i try to start it, the log throws an error. Can someone please help me with this ? Please see the SysOut log and FFDC log below. SystemOut.log [8/29/13 11:29:26:531 IST] 0000009c ApplicationMg A WSVR0200I: Starting

问题 How can I modify StarCluster config or code to include IAM Role? So that when I do this: starcluster start mycluster The IAM Role can be automatically activated in EC2 instances (master and nodes). I did try to look around but of no avail info. 回答1: Starcluster does not support this out the box. The automated solution would be to write a plugin (I couldn't find any) in python that uses the boto AWS library to add IAM roles to instances. If automation isn't required, then the good news is that

问题 We have a cluster with 2 JBOSS nodes. We have a batch job which loads all users details from a active directory to a DB. This job is run everyday. It was run before in a non clustered environment and hence we designed it as a singleton. Now we have a clustered environment and I do not know what is best way to achieve the same result. I want batch job to be run only once a day. We use spring and hibernate and I looked at Spring batch. I could not get any concise answer to my question. Can

问题 Is it possible to define default settings for memory and resources in cluster config file, and then override in rule specific manner, when needed? Is resources field in rules directly tied to cluster config file? Or is it just a fancy way for params field for readability purposes? In the example below, how do I use default cluster configs for rule a , but use custom changes ( memory=40000 and rusage=15000 ) in rule b ? cluster.json: { "__default__": { "memory": 20000, "resources": "\"rusage

问题 In a clustered JEE6 environment (Glassfish 3.1.2), a @Singleton bean is/can be created on every cluster node. If this Singleton Bean registers a programmatic timer on its @PostConstruct - how often is the @Timeout method executed? -- on only one of that singletons (per tick), or once (per tick) for each Singeton that registered that a timer? Below the code is an example what this question mean to this code. @Singleton public class CachedService { @Resource private TimerService timerService;

问题 I uses the following code to take advantage of cluster npm for my node app. form = require("connect-form"); express = require("express"); app = express.createServer(form({ keepExtensions: true })); cluster = require("cluster"); // App configuration // .... // Run on cluster cluster( app ) .use(cluster.logger('logs')) .use(cluster.stats()) .use(cluster.pidfiles('pids')) .use(cluster.cli()) .listen(port); This was working fine on node 0.4.4 but I end up with the following error on node 0.6.5

问题 I have a Java web app that I'm developing, using JBoss Seam as the application framework. I'd like to take advantage of Hibernate Search to provide entity searching capabilities. The integration has gone fine, and I'm getting closer to deployment. The setup for the app in production will be: 2 (or more) Tomcat app servers, load balanced PostgreSQL database on the backend My question is, how can I configure Hibernate Search so that the local Lucene indices are updated on App Server #2 when an

问题 I'm thinking about using hadoop to process large text files on my existing windows 2003 servers (about 10 quad core machines with 16gb of RAM) The questions are: Is there any good tutorial on how to configure an hadoop cluster on windows? What are the requirements? java + cygwin + sshd ? Anything else? HDFS, does it play nice on windows? I'd like to use hadoop in streaming mode. Any advice, tool or trick to develop my own mapper / reducers in c#? What do you use for submitting and monitoring

问题 When I run a job in HPC cluster in interactive mode, I can load the packages and if it fails (not sure why some packages fail to load at first instance) to load, I can load it by running the library (failed package) multiple times, but when I do qsub my_rscript_job.pbs , the packages fail to load. my my_rscript_job.pbs script is: #!/bin/bash #PBS -l walltime=100:00:00 #PBS -l ncpus=1,mem=100g source ~/.bashrc Rscript /dmf/mypath/map.r -t 100 The packages I need to load in the map.r script are