Live data from Hacker News

Robinhood trading site seizes up, customers miss stock rally

bloomberg.com

61–65 of 65 posts

Re: Robinhood trading site seizes up, customers miss stock rally

#61
post #15

Earlier quoted context omitted.

Stop losses are a feature you can use on the platform, but I don't know if they were executed on time if the whole platform was down...

Usually stop losses are an exchange feature, their atomicity is sort of the point. They wouldn’t be impacted by platform outages. That said I don’t have any idea about how Robinhood implements them.

Stop loss and stop limit orders are brokerage features.

Re: Robinhood trading site seizes up, customers miss stock rally

#62
post #61

Earlier quoted context omitted.

Usually stop losses are an exchange feature, their atomicity is sort of the point. They wouldn’t be impacted by platform outages. That said I don’t have any idea about how Robinhood implements them.

Stop loss and stop limit orders are brokerage features.

Interestingly when I was still writing trading platforms you would be dead wrong. But in the last few years at least nyse & bats no longer offer stops.

https://www.google.com/amp/s/www.cnbc.com/amp/2015/11/18/why...

Lots of other exchanges still offer them https://www.cmegroup.com/confluence/plugins/servlet/mobile?c...

I’d be curious how brokerages actually implement stops on exchanges that don’t offer them natively because synthetic stops have notoriously bad edge cases.

Re: Robinhood trading site seizes up, customers miss stock rally

#63

Earlier quoted context omitted.

There is no rigorous study that has proven this. I wish there were because I strongly prefer static typing but it’s more a belief than anything proven.

I'm always surprised by what comes across to me as a dogmatic need for a "study" to prove something. There is no study that says my yard needs mowing once a week to look good. I know it because I've lived it. Similarly, I've lived in code bases that were once dynamic and were rewritten to be static. This is not an academic argument: the compiler catches things that I would otherwise have had to remember to put into a…

Meanwhile I hate the look of tightly manicured lawns. You should definitely grow long grasses.

Without a more rigorous set of criteria we are arguing opinion. While my opinion is the same on static types there are people with their own experience on the other side of the argument.

They too have lived it.

Re: Robinhood trading site seizes up, customers miss stock rally

#64
post #55
post #43

Earlier quoted context omitted.

Hiring pool for Java is orders of magnitude larger, let's not pretend this isn't an issue with esoteric languages like Haskell

So your argument is you need a language with static typing to prevent defects, but also the language must be proverbially this tall to ride, and so you end up with, say, Java?

You need a language that isn't prone to foot bullets in long lived code that will pass through many developers with varying degrees of experience. Ada, Rust, Java would be suitable. I'm not a huge fan of any of these but they are better than winging it on duck typing for mission critical code.

Re: Robinhood trading site seizes up, customers miss stock rally

#65

Quantitative hedge funds must be making an absolute killing these couple weeks from the number of individual traders trying to daytrade through all this volatility.

Individual traders occasionally do beat the market makers. That’s why market makers need special rules to boost their profits... remember, nothing stopping individual billionaires from speculating in the market just like individual 9-5’ers.
Post reply on HN