cjbottaro

cjbottaro

NimblePool + Redix - why do all Redix pooling libraries use Poolboy instead?

I love NimblePool and use it frequently. I’m curious why all Redix pooling libraries use Poolboy instead.

From the NimblePool docs…

you can act directly on the resource, avoiding the data copying, but you need to keep the state of the resource in sync with the process

I take that to mean that you have to make sure the resource is in a good state before returning it via checkout. Which is fine; NimblePool has callbacks to ensure your resource is good before handing them out. I.e. if a Redix process is dead, you can use a NimblePool callback to create a new one.

NimblePool may not be a good option to manage processes.

Why? I understand that the pool itself can become a bottleneck, but that’s easily handled by having multiple pools and randomly selecting one to use.

Thanks for the help.

Most Liked

josevalim

josevalim

Creator of Elixir

Great question! Answer added to the README:

NimblePool may not be a good option to manage processes. After all, the goal of NimblePool is to avoid creating processes for resources. If you already have a process, using a process-based pool such as poolboy will provide a better abstraction.

dimitarvp

dimitarvp

Can somebody give me an example how exactly is NimblePool an actual pool? I’ve read part of its source code and it looks to do exactly the opposite of a pool to me – namely it serializes access to single state / resource.

:thinking:

Where Next?

Popular in Questions Top

Tee
can someone please explain to me how Enum.reduce works with maps
New
itssasanka
Hi all, Trying to get some more clarity over utc_datetime and naive_datetime for Ecto: https://hexdocs.pm/ecto/Ecto.Schema.html#module-...
New
Werner
Hi, I’m using Ubuntu 18.04 and after updating to OTP-24.0 yesterday i have this warning when I run “mix local.hex”: 14:57:30.512 [warn] ...
New
Harrisonl
We have an ECS cluster with 4 services, where each task joins a single cluster, via discovery ECS discovery service. Currently when I de...
New
fireproofsocks
I’m working on defining a simple Ecto schema for a table (in PostGres), but I don’t see where I can define a column as NOT NULL. Conside...
New
mgjohns61585
Could someone help me? I'm making my first elixir program, number guessing game. I can't figure out how to convert the user's guess from ...
New
rms.mrcs
Hi, I need to transform a list of numbers into a map where the keys are the indexes and the values are the original values of the list....
New
vonH
When I run the Plug and I recompile I wind up having to use Ctrl C to quit iex and start again. Witht the help of rlwrap I can use the cu...
New
baxterw3b
Hi guys, i’m new in the Elixir world, and i have to say, that i love it! i’m having some problem to understand anonymous functions with ...
New
9mm
I am constructing a JSON object (map) and I need to conditionally set a field. I’m trying to write proper elixir-way code… and I’m at a l...
New

Other popular topics Top

JDanielMartinez
Hi! May someone helps me, please! I have two apps into an umbrella project: the first one is Database, which manages queries, and the se...
New
pmjoe
I have a relationship of love and hate with Elixir. Lots of things are just absolutely right, but there are some things that are kind of ...
New
gshaw
What is the idiomatic way of matching for not nil in Elixir? E.g., First way: defp halt_if_not_signed_in(conn, signed_in_account) when...
New
albydarned
Hello all! I am typing this post from my new MacBook Pro with the M1 chip. I’m loving it so far, and will probably use it as my daily dr...
New
jerry
Good day to you all. I have been struggling to get a query involving like and ilike to work. Can anyone assist me on this, please? pro...
New
jononomo
I am trying to figure out how Mix knows whether the environment is test, dev, or prod -- where is this set? Thanks.
New
vertexbuffer
Hello, can anybody help here..? I have a list of players and I what to delete an element, but every for loop the list is reverting to ori...
New
script
If I have a string “1000 cfu/ml” . I want to remove the characters and / and space . So the string is like this "1000" What is the ...
New
vac
Hi, I'm quite new in Elixir and I'm trying to format a string to a PEM format. I have the certificate value like MIIDBTCCAe2...... and ...
New
mgjohns61585
Could someone help me? I'm making my first elixir program, number guessing game. I can't figure out how to convert the user's guess from ...
New

We're in Beta

About us Mission Statement