Updated: ================================================================ I finally found the reason with oprofile. It was because the routing cache of Symfony. We have lots of pages with different urls and symfony caches them in one file (serialized data). So the cache file grows large and it needs more CPU to serialize and unserialize...
Hi, I have a problem in the instances of the website in ASP.NET web application. website navigate in the the way Page1-->page2-->Page3-->Page4 and so on.. But in if some value in a drop down box in Page1 with result in the following flow. Page1-->page2-->Page4 But the problem is ... When i stalled it on load balancer. it gives...
What are some good web pages to read to become familiar with the ins and outs of creating asp.net web applications in an environment implementing Network-Load Balancing? ...
I'm using F5 as my load balancer and trying to pass some query string parameters to a filter on my J2EE app. It looks like F5 is somehow munging my query string parameters, though, as I can hit each node of my cluster individually with the query string parameters and everything works as expected but when I go through F5 it's as if the qu...
I am about to embark on writing a system that needs to re-balance it's load distribution amongst the remaining nodes once one of more of the nodes involved fail. Anyone have any good references on what to avoid and what works? In particular I'm curious how one should start in order to build such a system to to be able to unit-test it. ...
Hi, DNS Round Robin (DRR) permits to do cheap load balancing (distribution is a better term). It has the pro of permitting infinite horizontal scaling. The con is that if one of the web servers goes down, some clients continue to use the broken IP for minutes (min TTL 300s) or more, even if the DNS implements fail-over. An Hardware Loa...
I am using appsession config element for sticky session. I have 5 weblogic instances 3 of them are active and serving load now when load increases i start additional 2 instances. Now HAProxy marks them "Helthy" but does not transfer any traffic to it because it sticky. How do I transfer existing sessions to new weblogic servers. I am us...
hi! i'm doing a bit of research on this, so is there any security risk if we have the SSL certificate installed at the load balancer instead of the server? and what is the industry best practice to install SSL certificates? on server, load balancer, or ADC? thanks a lot! ...
Hosting an application on a web application server e.g. JBoss automatically brings in lots of app server specific functionalities with it e.g. security, clustering & load balancing etc. I have a situation where I have to develop a server app with which, legacy apps can talk to over TCP/IP socket as well as be highly available. Initially...
What is the best way to make a standalone java server built using J2SE Socket API high available? Using an HTTP server would have been a good choice specially for the built-in features e.g. security, clustering, transactions, etc. but the server should be capable of accepting TCP/IP socket connection from java & non-java clients (mainly ...
Looks like we are going to have to start load balancing our webservers here soon. We have a feature request to edit robots.txt dynamically which is not a problem for one host -- however once we get our load balancer up and going -- it sounds like I will have to scp the file over to the other host(s). This sounds extremely 'bad'. How wo...
I have a load balancer using apache: http://httpd.apache.org/docs/2.2/mod/mod%5Fproxy%5Fbalancer.html The problem is our bandwidth. We're trying to get more, but the ISP has to run new lines and keeps putting us off, so I'd like to throttle down the spiders to conserve bandwidth until we can get more. I tried mod cband, but it won't w...
I've got a C# service that currently runs single-instance on a PC. I'd like to split this component so that it runs on multiple PCs. Each PC should be assigned a certain part of the work. If one PC fails, its work should be moved to a backup machine. Data synchronization can be done by the DB, so that should not be much of an issue. My ...
One approach to high scalability is to use network load balancing to split processing load between several servers. One challenge that this approach presents is where servers are state aware - storing user state in a "session". One solution to this problem is "sticky session" (aka "session affinity") where each user is assigned to a ...
I would like to know how to implement CRUD operations on common files and folders. My web site requires load balancing. The web site nodes need to CRUD files and folders in a common network location. Note: At the moment, I am dealing with file changes by locking the file in exclusive mode when writing and shared read when reading, if t...
Hey there guys, I am a recent grad, and looking at a couple jobs I am applying for I see that I need to know things like runtime complexity (straight forward enough), caching (memcached!), and load balancing issues (no idea on this!!) So, what kind of load balancing issues and solutions should I try to learn about, or at least be vagu...
While running performance testing I've noticed that all the requests from any given IP address seem to all be going to the one cluster member. I've got about 7 concurrent users plugging away, and one server's got log activity while the other is sitting idle. Needless to say this is going to mess up my testing results unless I can find a...
We are currently looking at the problem of creating a load balancer in front of a set of servers offering the same web service (using soap over http). Once a client request has been sent to a given server, that server should respond to all subsequent requests from that client (this is sometimes referred as stickiness if I am not mistak...
I have to demonstrate the power of a cluster, i.e its advantage over a normal machine. Is there any way I can show,to the layman that "If this had been done on a normal workstation, it would have taken X hours and with this cluster its the nth fraction of the x hrs taken"? Please suggest some simulations/renders/computational tests tha...
Hello, I would like to write an upload system (photos, videos,...), which could be scaled and perform well even under heavy traffic. I am a .Net developer therefore I am more interested in using .Net technologies to achieve this. But I am also open to other technologies that I could use for this project. I am also thinking about Azure ...