reader_1000

Well, you are right, for most sites 404 returns a friendly error page. However for our case, it is a lot smaller page compared to 200 responses.

I always thought 404 responses would occupy trivial amount of memory on cache since they don't have a body. Ok, there is some overhead which might cause issues if there is too much 404. However, I think some guy who is trying to crawl all of your web site is a bigger problem if your web site is big. You can throttle him based on his IP and user agent but how do you differiante people who has same IP because they are behing a cooparete proxy?

I also thought cache poisoning means putting a bad response into a cache by sending a special request so that innocent people will be served malicious response because they hit the cache. I think article uses it in a different context.

When I configure a service that runs as SYSTEM user, I cannot perform administrative calls on that service. For example, a powershell script fails with "access denied" when it has an operation that requires admin rights. So I think, running as SYSTEM does not make you root all the time? Or am I missing something?

However, it is not a person.

I thing atop [1] is the tool I am looking for. It can keep historical data.

[1] http://atoptool.nl/

htop does not keep historical data as far as I know.

Maybe a little bit OT, In z/OS, you can see if a process has been put to suspended state because some other process is eating cpu and it keeps historical data about it. Is there a way to achive same thing for Linux? I am reading brendangregg's performance book, however I could not see anything related to this so far.

I think same problems apply to both ucarp and heartbeat, they do not check service status, if I am not wrong. Also it is stated that heartbeat is deprecated and continue with corosync, but corosync seems more complicated.

I looked at ucarp however, as far as I understand, it only looks if node is alive/down, not if particular port or service is down.

A lot of tools are mentioned in both article and in this thread. So what is the simplest and best way to achieve a failover virtual ip assigned to cluster members? I don't want the tool to start services, it would be enough if it won't send the traffic to failed note by determining with simple logic like if port 80 is not listening? Having a lot of alternatives is good but confusing and having powerful tools is also good but when only simple things needs to be achieved, it requires a lot of time to configure it and it is harder while troubleshooting. I prefer "keep it simple stupid".

Thanks for suggestion. How do you plan test case scenarios and how do you interpret them? There was an article stating that developers just use powers of 10 when doing performance tests but that does not necessarily give correct results.

I think this is a more general problem in programming, namely "Programming by Coincidence" [1]. Some people just tries to solve the problem without actually thinking about it, but just tries match the output specification.

[1] http://pragprog.com/the-pragmatic-programmer/extracts/coinci...

I checked my e-mail accout that I used for dropbox and There is a spam mail coming from ...@direct.nacha.org which is the same domain which one of the customer in forum received. So it seems they are right, this is not a random guess.

When you write "times" in documents, it starts to flash (I mean time entry goes and comes back continuosly)

I used DOM api to avoid quote character: document.links[0].href

I am the author of the post. You are right, even if you know what to code, you don't know how to code it and how part of the code is a more serious and problem specific problem I think. I am not sure that we can come up with a methodology that describes how to part. I think *DD techniques help to write cleaner code. However, I don't think that implementation becomes dependent to tests / documentation when you write them first. As with your example, sorting algorithms have same goal, so their last output will be same except if you change in-place sort to not-in-place sort. Moreover, we want our interfaces stable so that no change will break any other existing code. btw, thanks for link, I didn't know that.

I think the problem with the official site result is that offical site element is smaller than the others which makes me think that it is less important and less relevant to the search. Some description text or something else should be added to official site element to make it more notable.

Also I am wondering if DDG has a plan to add suggestions to their search. I use suggestions a lot in Google search and it would be nice to have them in DDG also so that transtion from other search engines to DDG will be smoother.

Note about add-on: When you first intall this, all the posts in the front page will be colored to red, this is normal because all the posts are new since there is no existing data about previous visit. You can refresh the page so that everything will back to normal.

You will see the benefit when you, say one hour later, enter the HN again by seeing only the new posts in the front page will be colored to red.