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After every 100 commands sent to a room, the server will poll the states from each active client, and save the latest snapshot it receives next to the backlog.

A freshly joined client receives the snapshot along with new commands entered after the snapshot was taken, so it only needs to replay 99 commands at most.

Moreover, the server has no way to validate the consistency of snapshots submitted by clients.

Therefore, an erroneous -- or malicious -- snapshot can corrupt the state for all newcomers, placing them out of sync with existing peers.

This chapter will discuss the revamped architecture we made for Ether Calc, a successor to Social Calc optimized toward simultaneous editing.

We'll see how we arrived at that architecture, how we used profiling tools, and how we made new tools to overcome performance problems.

The initial rewrite went smoothly, because both Feersum and are based on the same libev event model, and Pocket.io's API matches closely.

It took us only an afternoon to code up a functionally equivalent server in just 80 lines of code, thanks to the concise API offered by Zappa JS.

Spreadsheets are long-lived documents, and a collaborative session can accumulate thousands of modifications over weeks of editing.

If a client drops and reconnects, it can resume by asking for a log of all requests since it was disconnected, then replay those commands locally to get to the same state as its peers.

As we described in the AOSA chapter, this simple design minimized server-side CPU and RAM requirements, and demonstrates reasonable resiliency against network failure.

For the Socialtext team, performance was the primary goal behind Social Calc's design in 2006.

The key observation was this: Client-side computation in Java Script, while an order of magnitude slower than server-side computation in Perl, was still much faster than the network latency incurred during AJAX roundtrips: However, as we began to test it for production deployment, the performance and scalability characteristics fell short of practical use, motivating a series of system-wide rewrites in order to reach acceptable performance.




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