Put rescheduling tasks on the low-priority queue

apps/openassessment/assessment/worker/grading.py

@@ -5,6 +5,7 @@ Asynchronous tasks for grading essays using text classifiers.
 import datetime
 from celery import task
 from django.db import DatabaseError
+from django.conf import settings
 from celery.utils.log import get_task_logger
 from dogapi import dog_stats_api
 from openassessment.assessment.api import ai_worker as ai_worker_api
@@ -17,6 +18,10 @@ MAX_RETRIES = 2
 
 logger = get_task_logger(__name__)
 
+# If the Django settings define a low-priority queue, use that.
+# Otherwise, use the default queue.
+RESCHEDULE_TASK_QUEUE = getattr(settings, 'LOW_PRIORITY_QUEUE', None)
+
 
 @task(max_retries=MAX_RETRIES)  # pylint: disable=E1102
 def grade_essay(workflow_uuid):
@@ -93,7 +98,7 @@ def grade_essay(workflow_uuid):
         raise grade_essay.retry()
 
 
-@task(max_retries=MAX_RETRIES)  # pylint: disable=E1102
+@task(queue=RESCHEDULE_TASK_QUEUE, max_retries=MAX_RETRIES)  # pylint: disable=E1102
 def reschedule_grading_tasks(course_id, item_id):
     """
     Reschedules all incomplete grading workflows with the specified parameters.

apps/openassessment/assessment/worker/training.py

@@ -22,6 +22,8 @@ logger = get_task_logger(__name__)
 # If the Django settings define a low-priority queue, use that.
 # Otherwise, use the default queue.
 TRAINING_TASK_QUEUE = getattr(settings, 'LOW_PRIORITY_QUEUE', None)
+RESCHEDULE_TASK_QUEUE = getattr(settings, 'LOW_PRIORITY_QUEUE', None)
+
 
 class InvalidExample(Exception):
     """
@@ -146,7 +148,7 @@ def train_classifiers(workflow_uuid):
         raise
 
 
-@task(max_retries=MAX_RETRIES) #pylint: disable E=1102
+@task(queue=RESCHEDULE_TASK_QUEUE, max_retries=MAX_RETRIES) #pylint: disable=E1102
 def reschedule_training_tasks(course_id, item_id):
     """
     Reschedules all incomplete training tasks