执行问题

lib/tasks/statistic_subject_info.rake

@@ -10,7 +10,7 @@ namespace :subjects do
     column_value = "subject_id, study_count, course_study_count, initiative_study, passed_count, course_used_count, " +
         "school_used_count, created_at, updated_at"
     subjects.find_in_batches(batch_size: 50) do |s|
-      Parallel.each_with_index(s, in_threads: 4) do |subject, index|
+      Parallel.each_with_index(s, in_processes: 4) do |subject, index|
         puts("---------------------data_statistic: #{subject.id}")
         Rails.logger.info("---------------------data_statistic: #{subject.id}")
         data = Subjects::DataStatisticService.new(subject)
@@ -23,7 +23,8 @@ namespace :subjects do
             "#{data.passed_count}, #{data.course_used_count}, #{data.school_used_count}, " +
             "'#{Time.now.strftime('%Y-%m-%d %H:%M:%S')}', '#{Time.now.strftime('%Y-%m-%d %H:%M:%S')}')")
         buffer_size += 1
-        if buffer_size == 1000 || subjects.count == (index+1)
+        puts "buffer_size: #{buffer_size}; subjects_count: #{s.count}; index:#{index+1}"
+        if buffer_size == 1000 || s.count == (index+1)
           sql = "REPLACE INTO subject_records(#{column_value}) VALUES #{str}"
           puts sql
           ActiveRecord::Base.connection.execute sql
@@ -51,7 +52,7 @@ namespace :subjects do
         "choice_shixun_frequency, created_at, updated_at"
 
     subjects.find_in_batches(batch_size: 50) do |s|
-      Parallel.each(s, in_threads: 4) do |subject|
+      Parallel.each(s, in_processes: 4) do |subject|
         puts("---------------------course_info_statistic: #{subject.id}")
         Rails.logger.info("---------------------course_info_statistic: #{subject.id}")
         data = Subjects::CourseUsedInfoService.call(subject)
@@ -90,7 +91,7 @@ namespace :subjects do
     column_value = "subject_id, shixun_id, stage, shixun_name, challenge_count, course_count, " +
         "school_count, used_count, passed_count, evaluate_count, passed_ave_time, created_at, updated_at"
     subjects.find_in_batches(batch_size: 50) do |s|
-      Parallel.each_with_index(s, in_threads: 4) do |subject|
+      Parallel.each_with_index(s, in_processes: 4) do |subject|
         puts("---------------------shixun_info_statistic: #{subject.id}")
         Rails.logger.info("---------------------shixun_info_statistic: #{subject.id}")
         data = Subjects::ShixunUsedInfoService.call(subject)
@@ -131,7 +132,7 @@ namespace :subjects do
         "code_line_count, evaluate_count, cost_time, created_at, updated_at"
 
     subjects.find_in_batches(batch_size: 50) do |s|
-      Parallel.each_with_index(s, in_threads: 4) do |subject, index|
+      Parallel.each_with_index(s, in_processes: 4) do |subject, index|
         puts("---------------------user_info_statistic: #{subject.id}")
         data = Subjects::UserUsedInfoService.call(subject)
         data.each do |key|