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The biggest takeaway from this post is you don’t necessarily need centralization to be able to better distribute load.

There are many systems that either allow for (or encourage) centralization of decision making, sth I’ve always been sceptical about.

bit.ly/2kJFqsh
I’ve been unable to shake away the feeling that this approach of centralization (whether of health checks, or stats, or whatever other heuristic used to make load balancing decisions) it’s almost like encouraging shared global state.
Even if I could see what benefits it might bring (easier to shed load, access to info that doesn’t need to be distributed etc), it just didn’t sit well with me for some reason I couldn’t put my finger on.

Maybe it’s just a matter of opinion.
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Cindy Sridharan
@copyconstruct
There’s code that sparks joy and code that sparks anxiety when looking at it.

The latter is far more pervasive than the former. Is why people say coding is just as much art as science?

Except with art, you’re sort of “done” when a book, painting, music album is “done”.
On a daily basis, we take complex technical requirements and construct narratives in code.

Incoherent code is often the result of complexity accruing in small increments. Unless there’s a culture of constantly refactoring code (and there isn’t, in most cases), this is inevitable
Code feels like a living, sentient thing that requires constant care and attention to stop it from getting unwieldy.

It’s not even art; it’s like parenting, without ever having the prospect of being an empty nester. 😴
Read 3 tweets
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Cindy Sridharan
@copyconstruct
Blogged: Testing in Production, the hard parts

bit.ly/2oa2UYG

Topics include:
- patterns to curtail blast radius
- design of control and data planes
- deployments and lessons from high profile Google and Cloudflare outages born due to a test in prod gone wrong.
There’s a part 2 to this post, which is unwritten as of now.

Titled “testing in production: the fate of state”, it’ll be focused entirely on the testing of *stateful* services in production.

ETA - February 2020. I doubt I’ll have much spare time before January next year.
Thanks, as ever, to the best reviewer in the world @mononcqc. All mistakes and inaccuracies in the post are solely mine.

Thanks also to folks like @lhochstein @aaronblohowiak @hwilson1204 @MarcJBrooker who’ve been very generous in answering my questions over the months!
Read 3 tweets
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Cindy Sridharan
@copyconstruct
Logical isolation is as important as physical isolation when it comes to fault isolation.

Unless you’re serving identical requests arriving at an identical rate, requiring identical amount of work in a completely static environment, every server process is a multi tenant system.
It’s important when designing such services to be able to protect against misbehaving *class* of requests that trigger some form of degraded of pathological behavior, potentially affecting the response time of all other requests.
I think such services should be able to classify the requests they receive in some form (by assigning a QoS, or by identifying the client, or identifying a request profile) and be able to shed load *proactively*.

“Constant work” systems need to be shedding load constantly too.
Read 6 tweets

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Anand Giridharadas
@AnandWrites
Many pundits need to re-examine their spurious assumption that cautious incrementalism is the most reliable path to beating Trump.

If you think technocratic tinkering and dull accountant pragmatism are how you defeat a carnival barker, you haven’t attended enough carnivals.
I’m not saying the opposite is guaranteed to work, either. No one knows. You don’t know, and I don’t know, and no one knows. So stop ruling out bold vision as antithetical to the important task of removing Trump from office. This could go down many ways. Stay humble.
Trump makes people feel something. That is as neutral as I can be about him. He tickles the reptile brain. Hijacks the amygdala: fight!

Explaining why something is too expensive is not a very good match for that. Boldness is inspiring.
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The Outlaw Jennie (Waylon Jennings Daughter)
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Allow me. I have been working to expose this one for nearly a decade. Everything Google+Facebook+Twitter= A secret Monopoly That runs the Internet. Combine that with the 6 TV networks & You get the Secret Super Monopoly that controls everything you see, think, want & buy. #Qanon
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Jason Lengstorf
@jlengstorf
One of the biggest mental health improvements I’ve ever made was to interrupt negative thoughts with 3 positive observations.

2018 was hard for many of us; in 2019 I'd encourage you to try this mental experiment.

What are 3 good things in your life? lengstorf.com/how-to-be-posi…
Here are mine:

1. @marisamorby and I bought a house in Portland, near our families.
2. I’ve been getting to know the tech community in Portland, and y’all are such a wonderful crew.
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SEGA L’éveilleur®🚨
@segalink
“If the path before you is clear, you are probably on someone else’s.” Purpose leaves you in doubt of your sanity. It is never clear but requires your faith and trust in God. The peace you get is the assurance that all will be well. Pilots trust instrument clusters not clouds.⛱
One would have thought that Tweets with Childlock as this, simplified to the fullest will not need explanation but they sometimes confuse the simple folks one was trying to help from sinking in the linguistic territory abnitio.
There is no one with a meaningful purpose that has a clear path. You can only have clarity on your ability and capacity (if you have found yourself) and would need to trust God in the rest. Look at Moses, was his path clear before the read sea? Of course not. It seemed impossible
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Headsnipe01
@Headsnipe011
Post-9/11 GI Bill Housing Payment Rates Update

@MAGAREX1 @drawandstrike @HNIJohnMiller @catesduane @rising_serpent @almostjingo @tracybeanz @TheChiIIum @hfinch63

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WASHINGTON – Today the Department of Veterans Affairs (VA) announced key changes in the processing of GI Bill benefits payments under the Harry W. Colmery Veterans Educational Assistance Act of 2017 (Forever GI Bill).
Because of continued information technology difficulties with implementing sections 107 and 501 of the law, both of which change the way monthly housing allowance payments are calculated,
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Kyle Cheney
@kyledcheney
BIGGEST TAKEAWAY: The House Intelligence Committee report DISSENTS from the FBI/CIA/NSA assessment that Russia wanted to help @realDonaldTrump win.
Here's the part of the MUELLER indictment that alleges the Russian troll/identity theft operation was intended to disparage Clinton and help Trump.

Indictment doesn't explicitly tie the trolls' work to the Russian gov't though.
And here's the intel community's HIGH CONFIDENCE assessment that the aim of the Russian effort was the help Trump. dni.gov/files/document…
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