release-20.2: lease: fix lease retention bug for tables taken offline #61140
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postamar
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Tables can temporarily be taken offline, either permanently or temporarily. For example, executing a DROP TABLE statement will take a table offline permanently, and an IMPORT INTO will take a table offline only for the duration of the import and will bring it online again afterward. Previously, the lease manager would not distinguish between those two cases and would behave as if the table was gone forever. As a result any lease acquired after the table came back online would always be dropped upon dereferencing. Although this behavior is valid, it is inefficient, hence this patch. Fixes cockroachdb#57834. Release note: None
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ajwerner
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Feb 26, 2021
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Reviewed 3 of 3 files at r1.
Reviewable status:complete! 1 of 0 LGTMs obtained (waiting on @postamar)
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Tables can temporarily be taken offline, either permanently or
temporarily. For example, executing a DROP TABLE statement will take
a table offline permanently, and an IMPORT INTO will take a table
offline only for the duration of the import and will bring it online
again afterward.
Previously, the lease manager would not distinguish between those two
cases and would behave as if the table was gone forever. As a result any
lease acquired after the table came back online would always be dropped
upon dereferencing. Although this behavior is valid, it is inefficient,
hence this patch.
Fixes #57834.
Release note: None