Re: [Blockchain-interop] Gatweay Crash Recovery Discussion #1

[Rafael Belchior <[e-mail]>]

Thomas,
Yes, those assumptions are reasonable; i) we can also consider the case 
where a public-private key pair is lost, and thus a new pair needs to be 
generated. ii) I think we can assume a new SSL connection is created. Do 
you envision problems with this?

I think it makes sense for the gateway to resume operations from the 
last message before the crash because this mode is blocking, in 
principle - we can resume from the last event.

If anyone thinks this could be improved, please do not hesitate in 
providing feedback :)

Cheers,
Rafael


A 2020-12-02 00:17, Thomas Hardjono escreveu:
> Thanks Rafael.
> 
> Inline:
> 
>>>> > -- Which mode (self-healing mode, or primary-backup mode) do you
>>>> >>> > recommend?  (Which one would be the simplest approach for now, and
>>>> > what assumptions would we need to make).
>>>> 
>>>> The self-healing mode is simpler, as the same machine eventually
>>>> recovers, continuing its operations since the latest log entry. It 
>>>> does
>>>> not require, in principle, to read from the log storage API. 
>>>> However, we
>>>> are assuming it eventually recovers, and while this happens the 
>>>> system
>>>> is down, prejudicing availability.
> 
> For this scenario, there may need to be some assumptions about the
> gateway node.
> 
> For example, (i) the gateway recovers to 100% without any internal
> losses (e.g. loss of private-keys); (ii) that the SSL connection has a
> longer life-time than the duration of crash (unavailability); etc.
> 
> For short-duration unavailabilities, would the gateway pick-up
> (restart) from the last message before crash, or does it start from
> the beginning of the Phase?
> 
> Best
> 
> 
> -- thomas --
> 
> 
> 
> 
>> ________________________________________
>> From: Blockchain-interop [[e-mail]] on
>> behalf of Rafael Belchior
>> [rafael.belchior=[e-mail]]
>> Sent: Monday, November 30, 2020 11:49 AM
>> To: [e-mail]
>> Subject: [Blockchain-interop] Gatweay Crash Recovery Discussion #1
>> 
>> Dear All,
>> Attached, the slides of the first discussion on the crash recovery
>> mechanism for gateways, that took place during the last meeting.
>> 
>> 
>> Cheers,
>> 
>> --
>> Rafael Belchior
>> Ph.D. student in Computer Science and Engineering, Blockchain - 
>> Técnico
>> Lisboa
>> https://rafaelapb.github.io/
>> https://www.linkedin.com/in/rafaelpbelchior/
> 
> --
> Rafael Belchior
> Ph.D. student in Computer Science and Engineering, Blockchain - Técnico
> Lisboa
> https://rafaelapb.github.io/
> https://www.linkedin.com/in/rafaelpbelchior/

-- 
Rafael Belchior
Ph.D. student in Computer Science and Engineering, Blockchain - Técnico
Lisboa
https://rafaelapb.github.io/
https://www.linkedin.com/in/rafaelpbelchior/