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| -rw-r--r-- | src/content/en/slide/2020/10/19/feature-flags.adoc | 234 | ||||
| -rw-r--r-- | src/content/en/slide/2020/10/19/feature-flags.eslaides | 230 | ||||
| -rw-r--r-- | src/content/en/slide/2020/11/14/local-first-hype.adoc | 208 | ||||
| -rw-r--r-- | src/content/en/slide/2020/11/14/local-first-hype.eslaides | 204 | ||||
| -rw-r--r-- | src/content/en/slide/categories.adoc | 2 | ||||
| -rw-r--r-- | src/content/en/slide/index.adoc | 4 |
6 files changed, 452 insertions, 430 deletions
diff --git a/src/content/en/slide/2020/10/19/feature-flags.adoc b/src/content/en/slide/2020/10/19/feature-flags.adoc index 553cf4c..360c00f 100644 --- a/src/content/en/slide/2020/10/19/feature-flags.adoc +++ b/src/content/en/slide/2020/10/19/feature-flags.adoc @@ -1,230 +1,8 @@ ---- -# Rollout, feature flag, experiment, operational toggle += Rollout, feature flag, experiment, operational toggle +:categories: presentation +:deck: feature-flags.pdf -@Different use cases for backend, frontend and mobile +Different use cases for backend, frontend and mobile, and why the +four things people call "feature flags" are not the same thing. ---- -. -. -. -# "Feature flags" tend to come up when talking about continuous deployment - ---- -. -. -. -. -@CI: continuous integration -. -@CD: continuous delivery -. -@CD: continuous deployment - ---- -## Types -. -. -. -1. rollout -2. feature flag -3. experiment -4. operational toggle - -% {favicon.svg} ---- -## Rollout - -# For *rolling out* a new version of software - -Short-lived using percentages - -% FIXME: links -- a new deployment of kubernetes -- new APK released to the Play Store - ---- -## Feature flag - -# For turning a feature *on* or *off* - -Medium-lived using allow list, A/B test, percentage, app version, etc. - -- :new-chargeback-flow -- :new-debit-card-activation-screen - ---- -## Experiment - -# For analysing behaviour - -Medium-lived using allow list and A/B test - -- :debit-withdrawal-test - ---- -## Operational toggle - -# For disabling features in #crash-like situations - -Long-lived using percentage - -- :bank-barcode-payment -- :savings-bank-barcode-query-provider - ---- -. -. -@We know know about the types -# But they have different relevance for backend, frontend and mobile - ---- -## backend -. -. -1. rollout: k8s blue/green, canary and ~common-rollout~ common-xp -2. feature flag: ~common-rollout~ common-xp and datasets -3. experiment: common-xp -4. operational toggle: ~common-rollout~ common-xp - ---- -## frontend -. -. -1. rollout: CDN and page refreshes -2. feature flag: percentages and maybe IPs (no :customer/id on the website) -3. experiment: via dynamic backend control -4. operational toggle: via dynamic backend control - ---- -## backend -. -. -1. rollout: app stores -2. feature flag: via dynamic backend control -3. experiment: via dynamic backend control -4. operational toggle: via dynamic backend control - ---- -. -. -@Key differentiator is -# how much *control* we have over the environment - ---- -## backend -# full control -% FIXME: emoji -% 🎉 - ---- -## frontend -# partial control -We choose when to make a new version available - ---- -## mobile -# very limited control -- app stores can restrict updates (worse for iOS) -- customers still have to download new versions - ---- -# Costs -- more complex code -- compatibility with old app versions -- nesting is exponential - ---- -# Benefits -- dynamicity - ---- -## weighting costs × benefits -# The less control we have, the more we value dynamicity - ---- -## weighting costs × benefits -. -. -. -- backend: sometimes worth the cost -- frontend: almost always worth the cost -- mobile: *always* worth the cost - ---- -. -. -. -# Best practices - ---- -# dynamic content > feature flag -Always true for mobile, almost always for frontend - ---- -# Use :include-list for named groups -Always true for backend, frontend and mobile - - {:rules - #{{:types :include-list - :content {:filename "debit-team-members.txt"}}}} - ---- -# Always use :app-version -Only for mobile - - {:rules - #{{:types :app-version - :content {:min-version #{{:platform :android - :code 1000000} - {:platform :ios - :code 2000000}}}}}} - ---- -# Extend ~common-rollout~ common-xp if required - -That's how :include-list, :app-version, etc. were born - ---- -# Beware of many nested feature flags -True for backend, frontend and mobile - ---- -# Don't delete app-facing feature flags -True for mobile - ---- -. -. -. -# Include a feature flag on the whiteboarding phase - ---- -. -. -. -# Include deleting/retiring the feature flag at the end - ---- -# Avoid renaming a feature flag -Use :app-version with :min-version instead - ---- -. -. -. -# And most importantly... - ---- -# *Always* rely on a feature flag on the app -Never do a hotfix, avoid expedited releases at all costs - ---- -## References -. -% FIXME: links -1. "Feature Toggles (aka Feature Flags)", by Pete Hodgson -2. "Continuous integration vs. delivery vs. deployment", by Sten Pittet -3. Accelerate, by N. Forsgren, J. Humble and G. Kim -4. these slides: euandre.org/slide/ -5. prose version of this presentation -6. view source +link:{deck}[Read the deck (PDF)]. diff --git a/src/content/en/slide/2020/10/19/feature-flags.eslaides b/src/content/en/slide/2020/10/19/feature-flags.eslaides new file mode 100644 index 0000000..553cf4c --- /dev/null +++ b/src/content/en/slide/2020/10/19/feature-flags.eslaides @@ -0,0 +1,230 @@ +--- +# Rollout, feature flag, experiment, operational toggle + +@Different use cases for backend, frontend and mobile + +--- +. +. +. +# "Feature flags" tend to come up when talking about continuous deployment + +--- +. +. +. +. +@CI: continuous integration +. +@CD: continuous delivery +. +@CD: continuous deployment + +--- +## Types +. +. +. +1. rollout +2. feature flag +3. experiment +4. operational toggle + +% {favicon.svg} +--- +## Rollout + +# For *rolling out* a new version of software + +Short-lived using percentages + +% FIXME: links +- a new deployment of kubernetes +- new APK released to the Play Store + +--- +## Feature flag + +# For turning a feature *on* or *off* + +Medium-lived using allow list, A/B test, percentage, app version, etc. + +- :new-chargeback-flow +- :new-debit-card-activation-screen + +--- +## Experiment + +# For analysing behaviour + +Medium-lived using allow list and A/B test + +- :debit-withdrawal-test + +--- +## Operational toggle + +# For disabling features in #crash-like situations + +Long-lived using percentage + +- :bank-barcode-payment +- :savings-bank-barcode-query-provider + +--- +. +. +@We know know about the types +# But they have different relevance for backend, frontend and mobile + +--- +## backend +. +. +1. rollout: k8s blue/green, canary and ~common-rollout~ common-xp +2. feature flag: ~common-rollout~ common-xp and datasets +3. experiment: common-xp +4. operational toggle: ~common-rollout~ common-xp + +--- +## frontend +. +. +1. rollout: CDN and page refreshes +2. feature flag: percentages and maybe IPs (no :customer/id on the website) +3. experiment: via dynamic backend control +4. operational toggle: via dynamic backend control + +--- +## backend +. +. +1. rollout: app stores +2. feature flag: via dynamic backend control +3. experiment: via dynamic backend control +4. operational toggle: via dynamic backend control + +--- +. +. +@Key differentiator is +# how much *control* we have over the environment + +--- +## backend +# full control +% FIXME: emoji +% 🎉 + +--- +## frontend +# partial control +We choose when to make a new version available + +--- +## mobile +# very limited control +- app stores can restrict updates (worse for iOS) +- customers still have to download new versions + +--- +# Costs +- more complex code +- compatibility with old app versions +- nesting is exponential + +--- +# Benefits +- dynamicity + +--- +## weighting costs × benefits +# The less control we have, the more we value dynamicity + +--- +## weighting costs × benefits +. +. +. +- backend: sometimes worth the cost +- frontend: almost always worth the cost +- mobile: *always* worth the cost + +--- +. +. +. +# Best practices + +--- +# dynamic content > feature flag +Always true for mobile, almost always for frontend + +--- +# Use :include-list for named groups +Always true for backend, frontend and mobile + + {:rules + #{{:types :include-list + :content {:filename "debit-team-members.txt"}}}} + +--- +# Always use :app-version +Only for mobile + + {:rules + #{{:types :app-version + :content {:min-version #{{:platform :android + :code 1000000} + {:platform :ios + :code 2000000}}}}}} + +--- +# Extend ~common-rollout~ common-xp if required + +That's how :include-list, :app-version, etc. were born + +--- +# Beware of many nested feature flags +True for backend, frontend and mobile + +--- +# Don't delete app-facing feature flags +True for mobile + +--- +. +. +. +# Include a feature flag on the whiteboarding phase + +--- +. +. +. +# Include deleting/retiring the feature flag at the end + +--- +# Avoid renaming a feature flag +Use :app-version with :min-version instead + +--- +. +. +. +# And most importantly... + +--- +# *Always* rely on a feature flag on the app +Never do a hotfix, avoid expedited releases at all costs + +--- +## References +. +% FIXME: links +1. "Feature Toggles (aka Feature Flags)", by Pete Hodgson +2. "Continuous integration vs. delivery vs. deployment", by Sten Pittet +3. Accelerate, by N. Forsgren, J. Humble and G. Kim +4. these slides: euandre.org/slide/ +5. prose version of this presentation +6. view source diff --git a/src/content/en/slide/2020/11/14/local-first-hype.adoc b/src/content/en/slide/2020/11/14/local-first-hype.adoc index fd83115..6083dca 100644 --- a/src/content/en/slide/2020/11/14/local-first-hype.adoc +++ b/src/content/en/slide/2020/11/14/local-first-hype.adoc @@ -1,204 +1,8 @@ -# On "local-first" += On "local-first": beyond the CRDT silver bullet +:categories: presentation +:deck: local-first-hype.pdf -@Beyond the CRDT silver bullet +What local-first software asks of a system, and why conflict-free +replicated data types answer only part of it. ---- -## Part 1 -# Exposition - ---- -## Target -... -- documents -- files -- personal data repositories -.. -Not: banking services, e-commerce, social networking, ride-sharing, etc. - ---- -... -# 7 ideals for local-first software - ---- -... -# 1 - no spinners: your work at your fingertips - ---- -... -# 2 - your work is not trapped on one device - ---- -... -# 3 - the network is optional - ---- -... -# 4 - seamless collaboration with your colleagues - ---- -... -# 5 - the long now - ---- -... -# 6 - security and privacy by default - ---- -... -# 7 - you retain ultimate ownership and control - ---- -## Towards a better future -.... -@ CRDTs (Conflict-free Replicated Data Types) as a Foundational Technology - ---- -## Use case -. - # in node A and node B - s = "Hello, World" - - # in node A - s = "Hello, Alice" - - # in node B - s = "Hello, Bob" - -How to reconcile those? -- Hello, ABloibce -- Hello, AliceBob -- Hello, BobAlice -- Hello, Alice -\... - ---- -# Existing CRDTs differ -- performance -- storage -- compression -- metadata overhead - ---- -... -# Hint towards the "automerge" CRDT - ---- -...... -@@show comparison table, page 9 - ---- -## Part 2 -# Critique - ---- -## Software license -... -@@"In our opinion, maintaining control and ownership of data does not mean that the software must necessarily be open source." - ---- -## Example 1 - intentional restriction -. - #!/bin/sh - TODAY="$(date +%s)" - LICENSE_EXPIRATION="$(date -d 2020-10-27 +%s)" - if [ "$TODAY" -ge "$LICENSE_EXPIRATION" ]; then - echo 'License expired!' - exit 1 - fi - echo $((2 + 2)) -. - # today - $ ./useful-adder.sh - 4 - - # tomorrow - $ ./useful-adder.sh - License expired! ---- -## Example 2 - unintentional restriction -. - # today - $ useful-program - # ... useful output ... - - # tomorrow, with more data - $ useful-program - ERROR: Panic! Stack overflow! - ---- -.. -# local-first *requires* free software - -Otherwise "The Long Now" (ideal nº5) is lost - ---- -## Denial of existing solutions -.. -@@"In principle it is possible to collaborate without a repository service, e.g. by sending patch files by email, but the majority of Git users rely on GitHub." -. -Solution: either GitHub+CRDTs or git send-email - ---- -## Plain-text formats -. -@@"Git is highly optimized for code and similar line-based text file" -. -It even pulls software to the plain text directtion, e.g.: -- delivery-templates -- common-core.protocols.config -. -Why not exploit that more? - ---- -## Ditching of web applications -.. -@@"The architecture of web apps remains fundamentally server-centric -. -% FIXME: links -Disagree. Contrast PouchDB with Android Instant Apps - ---- -## Costs are underrated -. -- storage -- backups -- maintenance -. -Example: blog vs vlog - ---- -## Real-time collaboration a bit overrated -. -It is only possible on the presence of reliable, medium-quality network connection -.. -@@"X also works when inside an elevator, subway or plane!" - ---- -## On CRDTs and developer experience -. -@@"For an app developer, how does the use of a CRDT-based data layer compare to existing storage layers like a SQL database, a filesystem, or CoreData? Is a distributed system harder to write software for? -. -@YES. -. -% FIXME: link -See "A Note on Distributed Computing" - ---- -## Conclusion -. -Why this is a "paper I love": it took offline-first and ran with it. -. -But a pinch of CRDT won't make the world local-first. -. -The tricky part is the end of the sentence: "in spite of the Cloud". - ---- -## References -. -% FIXME: links -1. "Local-First Software: You Own Your Data, in spite of the Cloud", by M. Kleppmann, A. Wiggins, P. Van Hardenberg and M. F. McGranaghan -2. The Morning Paper article -3. "A Note on Distributed Compiting", by J. Waldo, G. Wyant, A. Wollrath and S. Kendall -4. these slides: euandre.org/slide/ -5. prose version of this presentation -6. view source +link:{deck}[Read the deck (PDF)]. diff --git a/src/content/en/slide/2020/11/14/local-first-hype.eslaides b/src/content/en/slide/2020/11/14/local-first-hype.eslaides new file mode 100644 index 0000000..fd83115 --- /dev/null +++ b/src/content/en/slide/2020/11/14/local-first-hype.eslaides @@ -0,0 +1,204 @@ +# On "local-first" + +@Beyond the CRDT silver bullet + +--- +## Part 1 +# Exposition + +--- +## Target +... +- documents +- files +- personal data repositories +.. +Not: banking services, e-commerce, social networking, ride-sharing, etc. + +--- +... +# 7 ideals for local-first software + +--- +... +# 1 - no spinners: your work at your fingertips + +--- +... +# 2 - your work is not trapped on one device + +--- +... +# 3 - the network is optional + +--- +... +# 4 - seamless collaboration with your colleagues + +--- +... +# 5 - the long now + +--- +... +# 6 - security and privacy by default + +--- +... +# 7 - you retain ultimate ownership and control + +--- +## Towards a better future +.... +@ CRDTs (Conflict-free Replicated Data Types) as a Foundational Technology + +--- +## Use case +. + # in node A and node B + s = "Hello, World" + + # in node A + s = "Hello, Alice" + + # in node B + s = "Hello, Bob" + +How to reconcile those? +- Hello, ABloibce +- Hello, AliceBob +- Hello, BobAlice +- Hello, Alice +\... + +--- +# Existing CRDTs differ +- performance +- storage +- compression +- metadata overhead + +--- +... +# Hint towards the "automerge" CRDT + +--- +...... +@@show comparison table, page 9 + +--- +## Part 2 +# Critique + +--- +## Software license +... +@@"In our opinion, maintaining control and ownership of data does not mean that the software must necessarily be open source." + +--- +## Example 1 - intentional restriction +. + #!/bin/sh + TODAY="$(date +%s)" + LICENSE_EXPIRATION="$(date -d 2020-10-27 +%s)" + if [ "$TODAY" -ge "$LICENSE_EXPIRATION" ]; then + echo 'License expired!' + exit 1 + fi + echo $((2 + 2)) +. + # today + $ ./useful-adder.sh + 4 + + # tomorrow + $ ./useful-adder.sh + License expired! +--- +## Example 2 - unintentional restriction +. + # today + $ useful-program + # ... useful output ... + + # tomorrow, with more data + $ useful-program + ERROR: Panic! Stack overflow! + +--- +.. +# local-first *requires* free software + +Otherwise "The Long Now" (ideal nº5) is lost + +--- +## Denial of existing solutions +.. +@@"In principle it is possible to collaborate without a repository service, e.g. by sending patch files by email, but the majority of Git users rely on GitHub." +. +Solution: either GitHub+CRDTs or git send-email + +--- +## Plain-text formats +. +@@"Git is highly optimized for code and similar line-based text file" +. +It even pulls software to the plain text directtion, e.g.: +- delivery-templates +- common-core.protocols.config +. +Why not exploit that more? + +--- +## Ditching of web applications +.. +@@"The architecture of web apps remains fundamentally server-centric +. +% FIXME: links +Disagree. Contrast PouchDB with Android Instant Apps + +--- +## Costs are underrated +. +- storage +- backups +- maintenance +. +Example: blog vs vlog + +--- +## Real-time collaboration a bit overrated +. +It is only possible on the presence of reliable, medium-quality network connection +.. +@@"X also works when inside an elevator, subway or plane!" + +--- +## On CRDTs and developer experience +. +@@"For an app developer, how does the use of a CRDT-based data layer compare to existing storage layers like a SQL database, a filesystem, or CoreData? Is a distributed system harder to write software for? +. +@YES. +. +% FIXME: link +See "A Note on Distributed Computing" + +--- +## Conclusion +. +Why this is a "paper I love": it took offline-first and ran with it. +. +But a pinch of CRDT won't make the world local-first. +. +The tricky part is the end of the sentence: "in spite of the Cloud". + +--- +## References +. +% FIXME: links +1. "Local-First Software: You Own Your Data, in spite of the Cloud", by M. Kleppmann, A. Wiggins, P. Van Hardenberg and M. F. McGranaghan +2. The Morning Paper article +3. "A Note on Distributed Compiting", by J. Waldo, G. Wyant, A. Wollrath and S. Kendall +4. these slides: euandre.org/slide/ +5. prose version of this presentation +6. view source diff --git a/src/content/en/slide/categories.adoc b/src/content/en/slide/categories.adoc new file mode 100644 index 0000000..feb64ff --- /dev/null +++ b/src/content/en/slide/categories.adoc @@ -0,0 +1,2 @@ += Articles by category +:type: categories diff --git a/src/content/en/slide/index.adoc b/src/content/en/slide/index.adoc new file mode 100644 index 0000000..4e5b53d --- /dev/null +++ b/src/content/en/slide/index.adoc @@ -0,0 +1,4 @@ += Slides + +Slide decks, rendered to PDF: no browser needed to read them, and no +JavaScript presentation framework to carry along. |