akka/akka-core

No way to use sharded daemon process with custom shard allocation strategy

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#31,320 opened on Apr 6, 2022

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 (0 comments) (0 reactions) (0 assignees)Scala (13,277 stars) (3,547 forks)batch import
1 - triagedhelp wantedt:cluster-sharding

Description

For regular typed sharding we use a field of Entity but a sharded daemon process isn't using the Entity API.

Noticed when answering https://discuss.lightbend.com/t/distribution-of-shardeddaemonprocess-actors/9628

Contributor guide

Tech stack
scala
Domain
backend
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
4
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
over 1 week
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
mostly clear
Prerequisites
Akka typed shardingshard allocation strategies
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
15
Research direction
The issue requests a feature to allow custom shard allocation strategies for ShardedDaemonProcess, similar to entity sharding. Currently, ShardedDaemonProcess does not use the Entity API and thus does not support custom allocation. To implement, one should study how entity sharding allows custom allocation (via ShardAllocationStrategy) and adapt ShardedDaemonProcess to accept a similar parameter. The referenced discussion at https://discuss.lightbend.com/t/distribution of shardeddaemonprocess actors/9628 may provide additional context. The Akka codebase in akka cluster sharding typed likely holds relevant source files such as ShardedDaemonProcess.scala and related classes.