[erlang-questions] Twoorl: an open source Twitter clone

Damien Morton <>
Fri Jun 6 01:30:24 CEST 2008


Umm, I think I would prefer it if my tweets didnt persist too long.

There's no expectation on the part of the users that they will be 
retained, so imagine the surprise if one of their users ended up in 
court only to be presented with a complete history of all their tweets.

No, in this case deletion is the right policy.

On 6/6/2008 8:55 AM, Richard A. O'Keefe wrote:
> On 5 Jun 2008, at 9:52 pm, Joe Armstrong wrote:
>   
>> Appending things to a input queue *and never deleting them* seems to
>> me a perfect way to deal with things.
>> If you every want to delete things it can only be for pragmatic
>> reasons and should be done years later
>> in a garbage collection sweep. If you never delete things you can
>> always go back later an fix errors!
>>     
>
> I note that this is one of the reasons why SAP is successful.
> Businesses use SAP because they *can* use SAP; their national tax
> departments are happy with SAP.  Their national tax departments
> are happy with SAP because they can *audit* business data held in
> SAP.  And they can do *that* because (ta-dah!) SAP never deletes
> anything!  If there is an incorrect data entry, for example, you
> can mark it as incorrect and replace it with a corrected record,
> but you cannot remove the old record from the system.
>
> I note that you can now buy a
> Western Digital WD10EACS 1 Terabyte 7200 RPM disc drive for
> USD 253 (which is currently NZD 330), price from pixelUSA.com.
> Deleting stuff makes a lot less sense than it used to.
>
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