docs: add troubleshooting section in MIGRATIONS.md #45
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galxy25
approved these changes
Oct 17, 2023
DracoLi
reviewed
Oct 18, 2023
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| Bun (the db client) uses a simple locking mechanism while running migrations that locks an entire table by attempting to write a row `(id, table_name)` to a table called `bun_migration_locks`. The table uses `table_name` as a unique key so that only one process can lock a table at a time. After the process finishes modifying the table, it deletes its lock. | ||
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| However, a problem occurs if the process dies while still holding a lock, as the lock will never be deleted & no other process will be allowed to lock the table. |
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where did you encounter this issue? was it the testnet db?
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yeah, on tesetnet. potentially because of my own rapid fire deploys 😄
noticed the migrations weren't running. turned on db query logging and noticed the service continually getting blocked on lock creation 🥴
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