cluster

MySQL NDB Cluster + Hibernate

Does anyone know if you can use mySQL Cluster with Hibernate? ...

What does Glassfish use as backing store to JNDI when clustered?

I have a JBoss background, where JNDI in clusters is provided by a centralized fail-over service, HA-JNDI. With this configuration you get one JNDI namespace across the cluster (i.e I can look up a service on node B from node A). When i look at the glassfish architecture, I cannot deduce how (and if) JDNI is synchronized between server i...

How to create a "Clustergram" plot ? (in R)

Hi all, I came across this interesting website, with an idea of a way to visualize a clustering algorithm called "Clustergram": I am not sure how useful this really is, but in order to play with it I would like to reproduce it with R, but am not sure how to go about doing it. How would you create a line for each item so it would sta...

Clustering on WebLogic exception on Failover

Hi all, I deploy an application on a WebLogic 10.3.2 cluster with two nodes, and a load balancer in front of the cluster. I have set the <core:init distributable="true" debug="true" /> My Session and Conversation classes implement Serializable. I start using the application being served by the first node. The console shows that the...

Running a lot of jobs with sun grid engine

I want to run a very large number (~30000) of jobs with Sun Grid Engine. I can theoretically, perform 30000 times the "qsub" command to submit jobs. However, I am afraid that will be too much. Is there a better way to do it? (i.e. from a file) Or otherwise, do you think it will work nonetheless? Thank you ...

How to deploy a Java/JBos Seam Application in a cluster using a floating IP?

Hi guys: We are trying to deploy a web application made in Java using JBoss Seam. We can access the application normaly, but when we try to access to the application accross a floating IP, it doesn't work. There is a cluster containing the web application. How to access correctly to the application hosted in the cluster? ...

Websphere application Server cluster information

Hi, I want to have a log file at each cluster level. Is there a way to retrieve cluster information at runtime. I am using Websphere Applciation Server ...

.net active passive cluster algorithm

I have a number of Windows servers. I want to run one copy of the same Windows Service (written in .NET) on each of the servers such that at any one time only one of them is "active" and all the others are passive. If the active windows service dies then a very short time later one, and only one, of the remaining passive windows services...

configuring log4j in a clustered environment

We are using log4j for the logging functionality. The application is running in a Clustered environment. How can I configure log4j properties such that all the instances log to the same log file? ...

MySQL vs SQL Server ?

I am interested in people's opinions on MySQL vs SQL Server. Our database is fairly simple; no stored procedures, and we use NHibernate as our ORM layer. I would like to make a case for switching from SQL Server to MySQL cluster on Linux. We need an enterprise level, clustered DB with failover and load balancing. Any opinions pro or con ...

Are there problems using PHP sessions in a servers cluster?

Hi there: We are developing a web site in PHP, and we have to use sessions. The site will be published in a servers cluster, but we have a dude: could that work? Thanks. I am sorry about my English. ...

Jar works with standalone hadoop, but not on the actual cluster (java.lang.ClassNotFoundException: org.jfree.data.xy.XYDataset)

Hi, I am trying to build my project using eclipse on windows and execute on a linux cluster. The project depends on some external jars, which I enclosed using eclipse's "Export->Runnable JAR -> Package required library into jar" build option. I checked the jar contains the classes within a folder structure, and the external jars are in ...

How to use a "Rocks" cluster

Hi, I've just joined a research lab at my University and been given access to a Cluster to compile and run the c++ code that I write. I use SSH to access it and simply use the cluster like a Linux terminal. I often have to wait a relatively long time while my code runs. I'm trying to figure out if there's a more efficient way use the C...

EJABBERD: Connection attempt from disallowed node

Having and issue with an ejabberd cluster. While trying ping the first node from the second, I'm getting : "Connection attempt from disallowed node" I know it's not a cookie issue, because the cookies on both servers match. ...

Are there any mature distributed caching solutions available for C++ besides memcached?

Most interested in peer-to-peer solutions - without central server. So, I imagine it like a library that brings to my application a functionality of transparent cache management with feature of remote instances synchronization. It should support cache record timeout and forcing invalidation. UPDATE: If not completely peer-to-peer - at l...

Do I need Liferay jackrabbit clustered configuration when using db

Hi, I configured Liferay jackrabbit to use database instead of disk store. This Liferay will be deployed in a clustered Weblogic. I was thinking if I still need to configure jackRabbit for cluster if it is using database? I understand that cluster configuration in repository.xml is required only when data is distributed between nodes b...

Diagnosing pathological behavior of a piece of cluster software

I'm using a kind of load balancer over a small cluster that is able to achieve >2000rps on zero-duration requests (t.i. ones that are immediately satisfied by the worker nodes). But as soon as the requests stop being zero-duration and start taking even 1ms, performance immediately drops >10x. The data being transfered in both directions...

Database access related info on clustered environment

My understanding of database cluster is less because I have not worked on them. I have the below question. Database cluster has two instance db server 1 & server 2. Each instance will have a copy of databases, considering the database has say Table A. Normally a query request will be done by only one of the servers which is randomly de...

Tomcat in Production

What's the best way to achieve central management of a cluster of Tomcat servers in production? Specifically, I'm looking for automatic application (WAR) deployment, consolidated logs, and basic health monitoring at a minimum. What open source or commercial management tools are people using for this? ...

How to implement cache synchronization in tomcat 6.0 cluster environment?

Hi, I'm currently working on a migration a web application to run in a cluster. This application uses caches. Some of this caches are reloaded in case the user saves something. I'ld like to inform the other nodes of the cluster about this, so that all nodes refresh their caches. It seems that the tomcat server has a group messaging bui...