更新大约需要20分钟，进度更新在 multisite:migrate 步骤暂时中断

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I suspect this is because we didn’t drop the index concurrently.

A normal DROP INDEX acquires an ACCESS EXCLUSIVE lock on the table, blocking other accesses until the index drop can be completed.

This should be fixed in PERF: Update migration to drop index concurrently. by tgxworld · Pull Request #28955 · discourse/discourse · GitHub.

@schneeland Thank you for taking the time to report the issue :+1:

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