Watermill
Languages and libraries
messaging library example
SHOW HN2021
18points
9comments
#1,472of 2,533 in 2021
Top 59%of 2021 by points
How HN took it
RoastedHalf or more of the comments are critical
0 positive, 1 neutral or asking, 0 mixed, 4 critical, out of 5 comments about the project. Thread score -0.50.
Idea: 0 for, 3 againstPerformance: 0 for, 1 against
The thread, comment by comment
Each row is a top-level comment and its replies, in HN's order. Select a cell to open that comment on HN.
positive neutral or mixed critical about another commenter or something else the maker
What HN said
Objections
Exactly-once delivery is impossible end-to-end in distributed systems; the project only covers a subset
From 3 comments
Exactly-once delivery in a distributed environment is impossible. Close-to-exactly-once is possible but there is always a way to have a situation where exactly-once fails once…
plank_time on HNBut that seems pointless. Exactly-once covering a subset of the pipeline doesn't guarantee exactly-once. At best it improves your chance of exactly-once delivery. If you really…
kevincox on HNThis seems like another odd definition of "exactly once". The underlying assumption appears to be that all you work is happening insides the sql transaction, so all the work the…
mimir on HN
Idempotency at application level is preferable
From 1 comment
This seems like another odd definition of "exactly once". The underlying assumption appears to be that all you work is happening insides the sql transaction, so all the work the…
mimir on HN
Request IDs are needed for true exactly-once; the example lacks them
From 1 comment
> 1. you need to use a Pub/Sub implementation that does support exactly-once delivery (only MySQL/PostgreSQL for now), To implement exactly-once delivery you first need exactly…
kevincox on HN
Key-value stores like Redis would be faster
From 1 comment
Seems like any key value store would be better for this. Redis, DynamoDB, etc.. could get a lot higher throughput on messages.
poorman on HN
Alternatives named
Idempotent application-level updates
From 1 comment
This seems like another odd definition of "exactly once". The underlying assumption appears to be that all you work is happening insides the sql transaction, so all the work the…
mimir on HN
Redis or DynamoDB
From 1 comment
Seems like any key value store would be better for this. Redis, DynamoDB, etc.. could get a lot higher throughput on messages.
poorman on HN