[Bug 856004] Re: "OperationalError: database is locked" encountered under very light load while using REST API

[Stephen A. Goss]

Ah, this is likely my fault and not an issue on the main mailman branch.
On our own branch we have code that will ping a callback HTML endpoint
to query our system upon incoming mail to a mailing list so we can rely
on our own code's rules for moderation, acceptance, rejection. This
internal delay for the HTTP request is almost certainly the culprit
here. This bug should probably be closed, though it is important to keep
in mind that it is not impossible for database locks to be held for
longer than normal under heavy load and that SQLite does not do well in
these conditions.

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https://bugs.launchpad.net/bugs/856004

Title:
  "OperationalError: database is locked" encountered under very light
  load while using REST API

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