Question

我试图在Rails中使用ActiveRecord并行更新Postgres中的条目，我的代码看起来像这样。

# new_records is the result of an ActiveRecord query.
Parallel.each(new_records, in_processes: 8) do |record|
            ActiveRecord::Base.connection_pool.with_connection do
                ActiveRecord::Base.transaction do
                    edit_record(record)
                    record.save!
                end
            end
end

当我运行它时，我收到以下错误：

ActiveRecord::StatementInvalid:
       PG::ConnectionBad: PQconsumeInput() server closed the connection unexpectedly
        This probably means the server terminated abnormally
        before or while processing the request.

任何人都可以帮我解决如何正确运行ActiveRecord事务的问题吗？

Answer 1

I got a similar problem when trying to do a parallel for ActiveRecord connection pool. I solve it by changing the worker type, from processes to threads. According to the parallel documentation, it is recomended to use threads if you are going to use explicity the ActiveRecord connection pool.

Your code could be rewriten to:

Parallel.each(new_records, in_threads: 8) do |record|
   ActiveRecord::Base.connection_pool.with_connection do
       ActiveRecord::Base.transaction do
           edit_record(record)
           record.save!
        end
   end
end

I hope you find this helpful.

如何在并行多进程块中使用ActiveRecord事务？

1 个答案: