0
голосов
1ответов
1301 просмотров

Using Tomcats(in an apache-tomcat cluster) as reverse-proxies to apache servers behind

I'm writing a small web service(like a content server) to search and serve content. Basically it has 2 parts - one dynamic part performing client authentication and providing search functionality over the content. The second part involves serving static content to the authenticated client. What ...

0
голосов
2ответов
1068 просмотров

MPI overhead in shared memory setup

I want parallelize a program. It's not that difficult with threads working on one big data-structure in shared memory. But I want to be able to use distribute it over cluster and I have to choose a technology to do that. MPI is one idea. The question is what overhead will have MPI (or other tec...

2
голосов
4ответов
3550 просмотров

Can computer clusters be used for general everyday applications?

Does anyone know how a computer cluster can be used for everyday applications, like for example video games? I would like to build a computer cluster that can run applications over the cluster that were not specifically designed for computer clusters and still see the performance increase. One ...

3
голосов
2ответов
1165 просмотров

Setting up a (Linux) Hadoop cluster

Do you need to set up a Linux cluster first in order to setup a Hadoop cluster ?

0
голосов
1ответов
54 просмотров

SMO some times doesn't display the instances in sql2008 cluster

I have used SMO API.in that i have used SmoApplication.EnumAvailableServers(FALSE) and from that i have filtered local instances i have used this approch insted of true to make this as convinent for remote sqldiscovery also.using that api created a dll and use that dll in c++. Now this is workin...

0
голосов
2ответов
411 просмотров

what is the maximum data stored on sql server cluster ever?

What do you think is the maximum database size ever stored on sql server cluster?

1
голосов
7ответов
242 просмотров

Fast restart technique instead of keeping the good state (availability and consistency)

How often do you solve your problems by restarting a computer, router, program, browser? Or even by reinstalling the operating system or software component? This seems to be a common pattern when there is a suspect that software component does not keep its state in the right way, then you just g...

1
голосов
2ответов
65 просмотров

Send a class, not just a class interface, between servers?

I am creating a grid application which requires me to send software packets that wrap a class out to participating nodes within my grid. The first idea that I came up with was to have the master nodes contact each node (running a Windows service) and send an assembly containing a class which ad...

-1
голосов
1ответов
1769 просмотров

Creating Emulated iSCSI Target in a Lab/Testing Environment using Windows Server 2008 R2

We have a single server running Windows Server 2008 with Hyper-V installed running 5 virtual machines. I have purchased a second DELL R805 Server so that we can create a fail-over cluster to our current R805 that is currently in production. Right now, our R805 connects via iSCSI to a MD3000i iS...

1
голосов
1ответов
3375 просмотров

Tomcat Clustering and Load Balancing?

I have 3 tomcat servers where users get into all time. They are 3 because the processing of each request is heavy (lot of sql). Lusers enters to server 1 or 2 or 3. Now I want to make them "one". I know I need do clustering but, will clustering spread the requests thru the 3 servers or here is wh...

0
голосов
2ответов
117 просмотров

smo doesnot display installed instances in w2k8 sql2k8 cluster?

I have cretaed an application via COM interoperability(using SMO and created a dll consume it in c++) which retrieves the local instances of sqlserver(basically try for network instances and from that trace out for local to make it as work for remote discovery of sqlinstances). it is worked in a...

1
голосов
1ответов
334 просмотров

C++: Status and control pattern

I'm writing a C++ background/server application for Linux/Windows. Is there a standard control/profiling/reporting service I should use to expose my application's current status in a standardized way? If not, what's a good pattern (or library) to use for exposing this kind of data and control? ...

0
голосов
1ответов
110 просмотров

How to ensure SWF is cached by the browser the first time it is downloaded when serving via HTTP and Mongrel cluster?

We have a Rails app that instantiates a SWF object 16 times (it has to do this, it's just the nature of the application). Instead of being downloaded once, it is being downloaded 16 times. How can we ensure this SWF is cached by the browser the first time it is downloaded? It's being served dir...

0
голосов
2ответов
1283 просмотров

Uploading large files to a cluster of servers

We have a cluster of 4 web servers which contain a few domains, one of which contains quite a lot of videos. We also have a 'staging' server which we usually sync/upload files to and then from there rsync them all out via a bash script to the other web servers. The problem we have is that quite ...

1
голосов
1ответов
427 просмотров

load balanced servers, clustered dbs and mutexes

I'm writing an multi-threaded app which will live on two active-active load balanced servers and access a clustered database on another server. Obviously I don't want multiple threads writing to the same records at the same time and SQL provides locking to ensure this doesn't happen. What are the...

0
голосов
1ответов
106 просмотров

ColdFusion Event Gateways in Clusters

When clustering instances of Coldfusion, how do the event gateways respond? Do the requests also get distributed among the clutster? Or is it per instance? Thanks, Faisal Abid

1
голосов
3ответов
200 просмотров

Maintaining software as a user (on a cluster)

Every cluster of computers I've encountered suffers from the same problem: its software is outdated. Naturally, one has the ability as a user to install everything from source in the home directory. I was wondering if there are any tools that would allow one to install and update software within ...

0
голосов
2ответов
184 просмотров

ColdFusion - Getting Massive Error Reports - No Problems Indicated By Users

Ok, here is the background. We have a clustered environment setup for running our coldfusion server, it basically split into two different instances, that the generic address redirects requests to. I have my app setup to send me emails whenever an error is caught by a user. Over the last week or...

0
голосов
4ответов
574 просмотров

SQL clustering or VM images

We currently have a failover sql cluster with two nodes. For a new large project which we have determined to be business critical, our development team is requesting a new 2 node failover sql cluster. Our server department has responded saying that they do not want to implement a cluster for ...

3
голосов
1ответов
920 просмотров

Invoking Java code across Application Server cluster nodes

Let's say I have a Java webapp deployed on some Application Server with clustering across a few nodes. In the webapp, we maintain a cache of some values retrieved from the database, stored in-memory as static variables. Whenever a user performs an update in a particular screen, we clear the cach...

5
голосов
4ответов
2302 просмотров

Using Linux Virtual Server for load balancing of zones in MMO game

I'm a developer of a MMO game and currently we're at my company facing some scalability issues which, I think, can be resolved with proper clustering of the game world. I don't really want to reinvent the wheel that's why I think Linux Virtual Server could be a good choice especially with some ...

2
голосов
1ответов
1500 просмотров

mysql ndb cluster add data node

This is my config.ini file options affecting ndbd processes on all data nodes: [ndbd default] NoOfReplicas=1 # Number of replicas DataMemory=80M # How much memory to allocate for data storage IndexMemory=18M # How much memory to allocate for index storage # For DataMe...

17
голосов
5ответов
17277 просмотров

Sharing a Java synchronized block across a cluster, or using a global lock?

I have some code that I want to only allow access to by one thread. I know how to accomplish this using either synchronized blocks or methods, but will this work in a clustered environment? The target environment is WebSphere 6.0, with 2 nodes in the cluster. I have a feeling that synchronized...

1
голосов
1ответов
2093 просмотров

Mysql NDB Cluster add another data node after setup

I have a NDB Cluster setup with two data nodes, I want to add third data node in this. What steps do I need to follow? For example :- I have to install mysql server on that third server and change the config file add the third server ip. Please correct me if I am wrong

0
голосов
1ответов
118 просмотров

How can I get my app to run on Windows Server 2008?

I have created a console application in C# using .NET 2.0. I have tested the application on the 32 and 64 bit versions of Windows Server 2003 and it is working properly. When I tried to run the application on Windows Server 2008, but it doesn't work. Later, someone told me to turn off UAC (User A...

1
голосов
3ответов
1361 просмотров

clustering/replicating counter state with application level scope

I need to replicate a sequence/counter across an eight node cluster. This means that each http request receives the next value in the sequence by calling something like getNextIntAndIncrement(), where the sequence state is synchronized across all servers. To clarify, this must exist at applicat...

43
голосов
9ответов
36546 просмотров

Singleton in Cluster environment

What is the best strategy to refactor a Singleton object to a cluster environment? We use Singleton to cache some custom information from Database. Its mostly read-only but gets refreshed when some particular event occurs. Now our application needs to be deployed in a Clustered environment. By...

6
голосов
3ответов
1919 просмотров

Spring Framework Connecting JVM with each other

I have 4 servers and JVM is installed on them. I wrote a java service that Quartz calls this services every 10 minutes. But in 4 servers, every 10 minutes 4 calls are done. This sitiuation creates race condition. I want only one service on 4 JVM. How can I do that with Spring Framework?

149
голосов
4ответов
152057 просмотров

Database cluster and load balancing

What is database clustering? If you allow the same database to be on 2 different servers how do they keep the data between synchronized. And how does this differ from load balancing from a database server perspective?

1
голосов
4ответов
16392 просмотров

Add Analysis Services to a clustered SQL Server 2008 instance

I have an existing multi-instance SQL 2008 cluster, and I'm trying to add Analysis Services to an existing instance. I start the installation, pick "Add features", configure SSAS, and then on the final pre-installation check, I fail the "Existing clustered or cluster-prepared instance" check. Of ...