LRU cache is not releasing thread on api.disconnect() if you've written to the chain.

[sicco-moonbeam]

• I'm submitting a ...

  • [x ] Bug report
  • Feature request
  • Support request
  • Other

• What is the current behavior and expected behavior?

In version 14.1.1, Node.js retains a thread after writing to the chain, even when api.disconnect() is called. While reading chain state behaves as expected, any write operation—such as a simple balances.transfer—prevents the Node.js process from terminating automatically. The attached WTFNode output shows that the hanging process originates in node_modules@polkadot\rpc-provider\cjs\lru.js:115.

I'm not entirely sure when this was introduced as I was previously on 10.11.2 but I suspect it's fairly recent - I noticed references to changes to the LRU cache in the last few commits.

• What is the motivation for changing the behavior?

api.disconnect() should gracefully release all resources. In a long-running process, this would result in a memory leak.

• Please tell us about your environment:

  • Version:

  • Environment:

    • Node.js - tested on latest stable version (v23.1.0) but can reproduce on older versions
    • Browser
    • Other (limited support for other environments)

  • Language:

    • JavaScript
    • TypeScript (include tsc --version) - 5.6.3
    • Other

[TarikGul]

Yes this would be related to #5997

cc: @filvecchiato

[sicco-moonbeam]

I can confirm it was introduced in 14.1.1 - downgrading to 14.0.1 fixed it for me.

[xlc]

I just spent 2 hours debugging why chopsticks no longer exit cleanly... Please add some regression tests.

[TarikGul]

I just spent 2 hours debugging why chopsticks no longer exit cleanly... Please add some regression tests.

Yes, we are actively getting this fixed ASAP and adding tests!

[TarikGul]

PR is in and a patch release will be up soon

[polkadot-js-bot]

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