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authorEuAndreh <eu@euandre.org>2020-11-07 11:24:58 -0300
committerEuAndreh <eu@euandre.org>2020-11-07 11:26:12 -0300
commitb18dbbeb4e62a1481bd039c32152850c94e764f4 (patch)
treeb7a1c59bf64b9594596897c0c43a10fec4af5f57 /_slides/2020-10-22-datomic-on-global-good-reasons-for-and-against-it.slides
parentAdd todos.org bugs article, with raw pofiles (diff)
downloadeuandre.org-b18dbbeb4e62a1481bd039c32152850c94e764f4.tar.gz
euandre.org-b18dbbeb4e62a1481bd039c32152850c94e764f4.tar.xz
Update "Datomic on global" slides, as presented
Diffstat (limited to '_slides/2020-10-22-datomic-on-global-good-reasons-for-and-against-it.slides')
-rw-r--r--_slides/2020-10-22-datomic-on-global-good-reasons-for-and-against-it.slides130
1 files changed, 122 insertions, 8 deletions
diff --git a/_slides/2020-10-22-datomic-on-global-good-reasons-for-and-against-it.slides b/_slides/2020-10-22-datomic-on-global-good-reasons-for-and-against-it.slides
index a18700d..8f207c9 100644
--- a/_slides/2020-10-22-datomic-on-global-good-reasons-for-and-against-it.slides
+++ b/_slides/2020-10-22-datomic-on-global-good-reasons-for-and-against-it.slides
@@ -13,16 +13,23 @@ published: false
---
+# Premise
+
+Datomic's bottleneck is **write** throughput, not read
+
+---
+
When creating a new service...
---
```clojure
-(defn prototype->database
- [prototype]
- (if (= :global prototype)
- :datomic
- #{:dynamodb :redis :nothing}))
+(defn database-for-service
+ [service]
+ (let [prototype (prototype-for-service service)]
+ (if (= :global prototype)
+ :datomic
+ #{:dynamodb :redis :nothing})))
```
---
@@ -31,11 +38,117 @@ When creating a new service...
---
-notifications vs toasty
+The deciding factor shouldn't be the prototype, but the **cardinality**
+
+---
+
+```diff
+ (defn database-for-service
+ [service]
+- (let [prototype (prototype-for-service service)]
+- (if (= :global prototype)
+- :datomic
+- #{:dynamodb :redis :nothing})))
++ (let [cardinality (cardinality-for-service service)]
++ (if (= :too-high cardinality)
++ #{:dynamodb :redis :nothing
++ :datomic))))
+```
+
+---
+
+```clojue
+(defn database-for-service
+ [service]
+ (let [cardinality (cardinality-for-service service)]
+ (if (= :too-high cardinality)
+ #{:dynamodb :redis :nothing
+ :datomic))))
+```
+
+---
+
+But how to determine when the cardinality is
+
+**`:too-high`**?
+
+---
+
+Let's think about the cardinality of existing services we know
+
+---
+
+What is the cardinality of...
+
+---
+
+# savings-accounts
+
+---
+
+# inductor
+
+---
+
+# crebito
+
+---
+
+# diablo
+
+---
+
+# lost-boy?
+
+---
+
+# hook?
+
+---
+
+# ledger
+
+---
+
+# blackleach
+
+---
+
+# notification
+
+---
+
+# toasty
+
+---
+
+# auth
+
+---
+
+# waypoint
+
+---
+
+# jurassic-park
+
+---
+
+Compare the database choice of services with similar cardinalities:
+
+## notifications vs toasty
+
+---
+
+Compare different cardinalities for services on global prototype:
+
+## jurassic-park vs auth
+
+---
-jurassic-park vs auth
+Compare different cardinality for different services inside the same domain:
-blackleach -> diablo -> ledger
+## savings-accounts -> blackleach -> diablo -> ledger
---
@@ -45,3 +158,4 @@ References:
1. these slides: [{{ site.tld }}/slides.html]({% link slides.md %})
2. [prose version of this presentation]({% link _articles/2020-10-22-datomic-on-global-good-reasons-for-and-against-it.md %})
+3. "[Understanding Database Sharding](https://www.digitalocean.com/community/tutorials/understanding-database-sharding)"