spring-projects / spring-projects/spring-boot

Support Netty's TCP server resources eager initialization

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#24,938 10 comments 7 reactions 0 assignees View on GitHub

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status: pending-design-work type: enhancement
Dominant language
Java
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Description

The following Stackoverflow question refered to the slowness of first requests made with a WebClient: https://stackoverflow.com/questions/53943499/workaround-for-the-slowness-of-the-webclient-first-request

I opened a an issue in reactor netty's repo which has been recently solved, adding a warmup functionality for TCP resources

I've upgraded the sample I provided to use Netty and Spring Boot 2.4.2. First request times are ~800ms and the subsequent ones ~60ms.

Would you consider adding Netty's warmup configuration as an option for Spring Boot/WebClient?

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reading the Spring Boot/WebClient integration and Reactor Netty's eager initialization documentation linked in the issue. Determine where a TCP resource warmup option belongs, then verify that enabling it removes the first-request initialization delay described in the issue.

Written by the indexing model from the issue text.

Assessment

Tech stack
java, spring-boot
Domain
backend
Issue type
Feature
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
45/100

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