22739764447
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Ran 05 Mar 2026 10:35PM UTC

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Build # 22739764447

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push

github

Committed by

web-flow

Commit Message

fix: use a Dynamic Supervisor for starting proxy connections (#865)

Currently, proxy connections are started from the ClientHandler with
DbHandler.start_link/1. This poses two problems:

1) There's no upper limit on the number of proxy connections a tenant
can open. The limits are all managed at the pool owner node. This means
that under certain conditions, a proxy node may open tons of connections
to the pool node that are doomed to fail with max connections error.

2) The DbHandler won't get properly code-updated on soft deployments,
due to being started by a worker process/not being under a supervisor.

This commit introduces a DynamicSupervisor pool with size `max_children`
set to`max_connections`, meaning the node can't open more than
`max_connections` proxy connections to the pool owner node. This
supervisor has a "watchdog" that periodically checks if it has no
children and shuts it down.

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