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Apply SKIP LOCKED optimization for reserving a delayed job entry #1

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Apply SKIP LOCKED optimization for reserving a delayed job entry #1

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2 changes: 1 addition & 1 deletion lib/delayed/backend/active_record.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -97,7 +97,7 @@ def self.reserve_with_scope_using_optimized_sql(ready_scope, worker, now)
# use 'FOR UPDATE' and we would have many locking conflicts
quoted_table_name = connection.quote_table_name(table_name)
subquery_sql = ready_scope.limit(1).lock(true).select("id").to_sql
reserved = find_by_sql(["UPDATE #{quoted_table_name} SET locked_at = ?, locked_by = ? WHERE id IN (#{subquery_sql}) RETURNING *", now, worker.name])
reserved = find_by_sql(["UPDATE #{quoted_table_name} SET locked_at = ?, locked_by = ? WHERE id IN (#{subquery_sql} SKIP LOCKED) RETURNING *", now, worker.name])
reserved[0]
when "MySQL", "Mysql2"
# Removing the millisecond precision from now(time object)
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