akka/akka-core

Warn if materializer is not referenced any more but StreamSupervisor is still alive

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#23,736 opened on Sep 27, 2017

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 (3 comments) (0 reactions) (0 assignees)Scala (3,547 forks)batch import
1 - triageddiscusshelp wantedt:stream

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Description

In "real", long-running apps, dropping the reference to the materializer is often a sign that you create too many one-off materializers without shutting them down again after use (potential memory leak).

I guess the StreamSupervisor could monitor a reference queue to see when this happens but it's hard to say if it will introduce spurious warnings.

Contributor guide

Research direction
Investigate how StreamSupervisor tracks references to materializers and implement a mechanism to warn when a materializer is dropped without proper shutdown.
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.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
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.
Clear
Prerequisites
ScalaAkka Streams
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40