Advertisement

09.16.2007 at 03:30AM PDT, ID: 22831606
[x]
Attachment Details
[x]
The Solution Rating System

With so many solutions, how can you tell which solutions are most likely to help you and which ones are not? To provide you with a tool to use, we rate our solutions based on various elements that most accurately determine if a solution is a quality solution. To explain what factors affect the solution rating, here are the elements we take into consideration when formulating our solution rating.

  • The Grade of the Solution
  • The Zone Rank of the Expert Providing the Solution
  • The Number of Author and Expert Comments
  • The Number of Experts Contributing
  • The Feedback of the Community

Your Input Matters
Because of the way the system is set up, the most important variable in this equation is you. As a member of Experts Exchange, you are able to cast your vote on the quality of the solutions in regard to how complete, accurate, helpful and easy to understand each solution is. When you provide your feedback, each rating is adjusted accordingly. So, if you see a solution that has a poor rating that you think is a good solution, let us know by rating it. As you do, the rating will be adjusted and will become more accurate for other members of our site.

If you have any suggestions that you would like to make for our rating system, please ask a question in the Suggestions Zone of Community Support.

Thank you!

6.8

Solve race condition with parrell running applications

Asked by x_terminat_or_3 in Theory, PHP and Databases, MySQL Server

Tags: , ,

Hi all

As background info: we process sms messages transmitted through http and smpp links

One of the conditions of our providers is to only send out a single message per recipient in a certain time span. (ie wait 30 seconds before sending another sms to the same number)

I have been trying to implement this with little success.

I created a structure in a mysql database that contains the timestamp when the 'cooldown' period for a recipient has expired, and update that each time a message goes out.

The reason why this doesn't work is because there are numerous processing queues, all running at the same time, and messages for the same recipient will be queued in different queues.

So, 2 queues can be working on a message for the same recipient, and almost simultaneously, send an update to the cooldown table.

Please ask me if you need more info on this.

One of my reasonings, therefore, is, to ensure every message for the same recipient is sent to the same queue, as long as a cooldown period is active for that recipient.

I find I only succeed in moving the race condition to this part of the system, without actually solving it.

Any ideas anyone?Start Free Trial
 
Loading Advertisement...
 
[+][-]09.16.2007 at 02:26PM PDT, ID: 19901651

Assisted solutions are selected by the member who asked the question as a comment that contributed to their question's solution.

Start your 7-day free trial to view this Assisted Solution or ask the Experts your question.

 
[+][-]09.16.2007 at 02:53PM PDT, ID: 19901713

Often, when Experts are collaborating with members who have asked questions, they will request additional information about the problem. Askers respond with an author comment like this one.

Start your 7-day free trial to view this Author Comment or ask the Experts your question.

 
[+][-]09.17.2007 at 01:43AM PDT, ID: 19903548

View this solution now by starting your 7-day free trial. Setting up your free trial is quick, easy, and secure. We will return you to this solution, unlocked, when you're done.

 

About this solution

Zones: Theory, PHP and Databases, MySQL Server
Tags: race, condition, mysql
Sign Up Now!
Solution Provided By: KirillMueller
Participating Experts: 2
Solution Grade: A
 
 
[+][-]09.17.2007 at 11:39AM PDT, ID: 19907132

Often, when Experts are collaborating with members who have asked questions, they will request additional information about the problem. Askers respond with an author comment like this one.

Start your 7-day free trial to view this Author Comment or ask the Experts your question.

 
[+][-]09.17.2007 at 11:44AM PDT, ID: 19907169

Often, when Experts are collaborating with members who have asked questions, they will request additional information about the problem. Askers respond with an author comment like this one.

Start your 7-day free trial to view this Author Comment or ask the Experts your question.

 
[+][-]09.17.2007 at 11:49AM PDT, ID: 19907225

At Experts Exchange, members can ask their questions to thousands of technology professionals, also known as Experts. Experts compete and collaborate to answer those questions by leaving comments like this one.

Start your 7-day free trial to view this Expert Comment or ask the Experts your question.

 
[+][-]09.17.2007 at 11:50AM PDT, ID: 19907237

Often, when Experts are collaborating with members who have asked questions, they will request additional information about the problem. Askers respond with an author comment like this one.

Start your 7-day free trial to view this Author Comment or ask the Experts your question.

 
[+][-]09.17.2007 at 11:55AM PDT, ID: 19907276

Often, when Experts are collaborating with members who have asked questions, they will request additional information about the problem. Askers respond with an author comment like this one.

Start your 7-day free trial to view this Author Comment or ask the Experts your question.

 
[+][-]09.17.2007 at 03:46PM PDT, ID: 19909010

Experts Exchange has a courteous staff of administrators who help members get the most out of the website by means of administrative comments like this one.

Start your 7-day free trial to view this Administrative Comment or ask the Experts your question.

 
 
Loading Advertisement...
20080716-EE-VQP-32 / EE_QW_2_20070628