leventov opened a new pull request #6033: Synchronize scheduled poll() calls in SQLMetadataRuleManager to prevent flakiness in SqlMetadataRuleManagerTest URL: https://github.com/apache/incubator-druid/pull/6033 This PR should fix #6028, however it doesn't address two other problems mentioned in that issue: - Possibility of a deadlock in a database when there is a query making an inner join of a table with itself, and a query dropping this table in parallel. I wonder if there is an SQL feature to "truly lock" a table to prevent this. - `SQLMetadataRuleManager` possibly mixing two abstractions, that should be in different classes.
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