Reply to: Hash collisions

[stackpole]

Yawn... when out of arguments you (AtW) resort to this stupid statements ...

What, do you mean like your initial contribution to this thread?

AtW trying hard to sound clever ...
Zzzzzzzzzzzzzzzzzzz

[Crazyhorse]

I've been away for 18 months.
Nice to see you still at atw but what happened to your 5,000,000 posts.

[AtW]

ps: errr hate to point this again but, I am employed and you are NOT....

Its false argument -- I was not, am not and not going to be looking for employment of your kind.

[SandyDown]

Indeed, and I merely express my opinion about your lack of educated opinion -- I am not trying to look smart just like you IQ is pretty clear from your posts related to IT: zzzzzzz is about as much you can hack. What was your job title again? DBA? Do you know how hash joins work?

Yawn !!

ps: errr hate to point this again but, I am employed and you are NOT....

[AtW]

I am entitled to say what I like on this BB... if you post here you have to accept that eveyone has the right to comment and state their opinion..

Indeed, and I merely express my opinion about your lack of educated opinion -- I am not trying to look smart just like you IQ is pretty clear from your posts related to IT: zzzzzzz is about as much you can hack. What was your job title again? DBA? Do you know how hash joins work?

[SandyDown]

When you have nothing to say on topic you say "Zzzzzzzz", if you ain't got anything to say on the topic then don't say anything.

I don't even think you know how hashes and hashtables work in the first place.

I am entitled to say what I like on this BB... if you post here you have to accept that eveyone has the right to comment and state their opinion.. and I find your posts are very boaring, you are trying soooo hard to look clever.. it just boars me to death ....

so

yawn !!!

oh also Zzzzzzzzzzzzzzzz

[AtW]

Yawn... when out of arguments you resort to this stupid statements ...

When you have nothing to say on topic you say "Zzzzzzzz", if you ain't got anything to say on the topic then don't say anything.

I don't even think you know how hashes and hashtables work in the first place.

[The Lone Gunman]

Oi, take this and SKA updates to technical where they belong.

[SandyDown]

Have you washed all the dishes and prepared dinner for your partner, love? Better stick to things you know best!

Yawn... when out of arguments you resort to this stupid statements ...

Yawn again .. and Zzzzzzzzzzzzzzzzzz

[AtW]

AtW trying hard to sound clever ...
Zzzzzzzzzzzzzzzzzzz

Have you washed all the dishes and prepared dinner for your partner, love? Better stick to things you know best!

[SandyDown]

Pissed off due to discovering that 64-bit hash function that I expected to have nil collisions in my lifetime actually seems to have a FECKLOAD in sample of just 40 mln URLs

Its MD5 time, which sucks as its slowers to calculate and takes double the space

AtW trying hard to sound clever ...
Zzzzzzzzzzzzzzzzzzz

[AtW]

Aye, ye cannae alter the laws of mathematics, captain!

Dude, fast low-bit hash collisions are a reality, for example 32-bit CRC is really bad in this respect (for a reasonable number of different entries of course), MD5 - 128 bit is good in this respect but its way slower and takes whole 128 bit, so I settled on 64-bit hash function, naturally I did not do any fundamental theoretical research into how good the function is -- just tested on a bunch of data and it appeared OK, this incident really got me scared but luckily traced error to piece of code always returning same URL for some of URLs, which explained same hashes. Phew that was close

[wendigo100]

Looks like its some other bug than hash's collision, phew, what a fecking relief!

Aye, ye cannae alter the laws of mathematics, captain!

[AtW]

Looks like its some other bug than hash's collision, phew, what a fecking relief!

[Francko]

Exactly what I was just thinking