forked from https://github.com/symfony/symfony
abf11d8ba8
This PR was squashed before being merged into the 4.3 branch (closes #32979).
Discussion
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[Messenger] return empty envelopes when RetryableException occurs
| Q | A
| ------------- | ---
| Branch? | 3.4 or 4.3 for bug fixes <!-- see below -->
| Bug fix? | yes
| New feature? | no <!-- please update src/**/CHANGELOG.md files -->
| BC breaks? | no <!-- see https://symfony.com/bc -->
| Deprecations? | no <!-- please update UPGRADE-*.md and src/**/CHANGELOG.md files -->
| Tests pass? | yes <!-- please add some, will be required by reviewers -->
| License | MIT
| ~~Doc PR~~ | ~~symfony/symfony-docs#12109~~
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Problem occurs when you are using more than 1 worker with Doctrine Transport.
`Symfony\Component\Messenger\Transport\Doctrine\Connection::get` does a query `SELECT ... FOR UPDATE` and this locking query could lock table and workers stops. But using locks can result in dead locks or lock timeouts. Doctrine renders these SQL errors as RetryableExceptions. These exceptions are often normal if you are in a high concurrency environment. They can happen very often and your application should handle them properly.
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| CODE_OF_CONDUCT.md | ||
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| UPGRADE-4.0.md | ||
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| UPGRADE-5.0.md | ||
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