jm + via:rbranson   2

_Amazon Aurora: Design Considerations for High Throughput Cloud-Native Relational Databases_
'Amazon Aurora is a relational database service for OLTP workloads offered as part of Amazon Web Services (AWS). In this paper, we describe the architecture of Aurora and the design considerations leading to that architecture. We believe the central constraint in high throughput data processing has moved from compute and storage to the network. Aurora brings a novel architecture to the relational database to address this constraint, most notably by pushing redo processing to a multi-tenant scale-out storage service, purpose-built for Aurora. We describe how doing so not only reduces network traffic, but also allows for fast crash recovery, failovers to replicas without loss of data, and fault-tolerant, self-healing storage. We then describe how Aurora achieves consensus on durable state across numerous storage nodes using an efficient asynchronous scheme, avoiding expensive and chatty recovery protocols. Finally, having operated Aurora as a production service for over 18 months, we share the lessons we have learnt from our customers on what modern cloud applications expect from databases.'
via:rbranson  aurora  aws  amazon  databases  storage  papers  architecture 
10 weeks ago by jm
Startup equity gotcha
'Two months ago, an early Uber employee thought that he had found a buyer for his vested stock, at $200 per share. But when his agent tried to seal the deal, Uber refused to sign off on the transfer. Instead, it offered to buy back the shares for around $135 a piece, which is within the same price range that Google Ventures and TPG Capital had paid to invest in Uber the previous July. Take it or hold it.'

As rbranson on Twitter put it: 'reminder that startup equity is basically worthless unless you're a founder or investor, OR the company goes public.'
startups  uber  stock  stock-options  shares  share-option  equity  via:rbranson  work 
june 2014 by jm

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