load-balancing | 易学教程

websockets with load balancer scalability

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问题 I use a load balancer with my web site. The browser initiates a websocket connection to my app server. Does the open connection consume any resources on the LB or is it direct between the browser and the app server? If there is something open on the LB isn't it a bottleneck? I mean if my LB can handle X open connections then the X+1 user could not even open a connection. 回答1: It depends! The most efficient load balancers listen for requests, do some analysis, then forward the requests; all

Will ASP.Net MVC's AntiForgeryToken Method work with Load Balancers?

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问题 Using ASP.Net MVC v2.0, I am starting to research the use of the Html.AntiForgeryToken() method when submitting forms that process data. I can see it sets a hidden value in the form HTML and it sets the same value in a session cookie. The question is will different web servers in a load balanced configuration create the same token in the HTML forms? It seems if they don't then the cookie and hidden form value wouldn't match and we would have a problem. Before I get into actually testing this

Matlab parallel computing toolbox, dynamic allocation of work in parfor loops

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I'm working with a long running parfor loop in matlab. parfor iter=1:1000 chunk_of_work(iter); end There are generally about 2-3 timing outliers per run. That is to say for every 1000 chunks of work performed there are 2-3 that take about 100 times longer than the rest. As the loop nears completion, the workers that evaluated the outliers continue to run while the rest of the workers have no computational load. This is consistent with the parfor loop distributing work statically. This is in contrast with the documentation for the parallel computing toolbox found here : "Work distribution is

504 Gateway Timeout - Two EC2 instances with load balancer

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问题 This might be the impossible issue. I've tried everything. I feel like there's a guy at a switchboard somewhere, twirling his mustache. The problem: I have Amazon EC2 running an application. It functions without issue when there is only one instance and no load balancer. But in my production environment I have two identical instances running behind one load-balancer and when performing certain tasks, like a feature that generates a PDF and attaches it to an email, nothing happens at all, and

Calling web service that sits on a load balancer with jax-ws returns at http status of 302, but when I use SoapUI it works fine

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问题 When I call a web service that sits on a load balancer with jax-ws, it returns The server sent HTTP status code 302: Moved Temporarily and then fails, but when I use SoapUI it works fine. Is there a way that I can configure the service to handle this correctly? I generated the webservice code using wsimport and make the call as such NotificationWebService service = new NotificationWebService(wsdlLocation, qName); NotificationWebServiceSoap serviceSoap = service.getNotificationWebServiceSoap()

MySQL Proxy Alternatives for Database Sharding

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问题 Are there any alternatives for MySQL Proxy. I don't want to use it since it's still in alpha. I will have 10 MySQL servers with table_1 table_2 table_3 table_4 ... table_10 spread across the 10 servers. Each table is identical in their structure, their just shards with different data sets. Is there a alternative to MySQL Proxy, where I can have my client application connect to a single SQL Server (A proxy), which looks at the query and fetches the data on behalf of it. For example, if the

How to create Floating IP and use it to configure HAProxy

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问题 I have recently tried to load balance my application using HAProxy and was able to do it successfully. Later, I have come across a concept called Floating IP, which can be used along with keepalived to make the load balancer highly available. I wasn't able to understand how to create the floating Ip though. How can I create Floating IP and use it to configure HAProxy? Thanks. 回答1: Assumptions: This works on Ubuntu 14.04 haproxy-primary IP: 198.51.100.10 haproxy-secondary IP: 198.51.100.20

Multi-tenant ServiceStack API, same deployment to respond to requests on different hostnames?

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问题 We're creating APIs using ServiceStack that are multi-tenant. We want to do DNS-based load-balancing and routing, rather than stitch things up via a reverse proxy (like nginx or haproxy). We have Request DTOs that have a Tenant parameter. ServiceStack (and its SwaggerFeature) allow us to define custom routes, and document the DTOs such that we can read values from path, query, headers, or body. How do we (best) wire things so that DTO properties can read values from a hostname pattern as well

Explanation of Tenant Load Balancer in SaaS maturity model level 4

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I've already done some research about SaaS maturity level based on Gianpaolo SaaS maturity model . Right now I got confused about SaaS maturity level 4. It said, it has a "Tenant load balancer" that dynamically calls a new application instance to serve load balancing for a SaaS application. I want to know what this "Tenant load balancer" really means. How do we implement this "Tenant load balancer" in the real world or in an application server? Can anyone give me some good explanation and an example, like an implementation in Java EE technology? techuser soma The key concept is horizontal

Tomcat load balancer solutions

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I'm looking for a good load balancer to use with Tomcat. Our application doesn't store anything in the session context so it isn't important to redirect to same server for the same user. I'd simply like something that can queue requests round-robin style or based on each server's inidividual load. I'd also like to be able to add application servers to those available to handle requests without having to restart the load balancer. We're running the application on linux if that matters. If all you need is a software load balancer on linux use Apache Webserver2, Mod-Jk and Tomcat Clustering: At