Add an optional per-table lock timeout #33
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Prior to this commit, if a long (auto)vacuum or other lock was preventing Flexible Freeze from vacuuming a table, it would wait for that lock indefinitely, or until run_min minutes elapsed (if specified). This commit addresses the problem by adding --lock-timeout, an optional flag for specifying the timeout (in milliseconds). If Flexible Freeze can't acquire a table lock after that amount of time, it gives up and moves on to the next table.
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Prior to this commit, if a long (auto)vacuum or other lock was preventing Flexible Freeze from vacuuming a table, it would wait for that lock indefinitely, or until run_min minutes elapsed (if specified).
This commit addresses the problem by adding --lock-timeout, an optional flag for specifying the timeout (in milliseconds). If Flexible Freeze can't acquire a table lock after that amount of time, it gives up and moves on to the next table.