add MAX_TASK_PRE_CHILD for celery

api/docker/entrypoint.sh

@@ -20,7 +20,8 @@ if [[ "${MODE}" == "worker" ]]; then
     CONCURRENCY_OPTION="-c ${CELERY_WORKER_AMOUNT:-1}"
   fi
 
-  exec celery -A app.celery worker -P ${CELERY_WORKER_CLASS:-gevent} $CONCURRENCY_OPTION --loglevel ${LOG_LEVEL:-INFO} \
+  exec celery -A app.celery worker -P ${CELERY_WORKER_CLASS:-gevent} $CONCURRENCY_OPTION \
+    --max-tasks-per-child ${MAX_TASK_PRE_CHILD:-50} --loglevel ${LOG_LEVEL:-INFO} \
     -Q ${CELERY_QUEUES:-dataset,mail,ops_trace,app_deletion}
 
 elif [[ "${MODE}" == "beat" ]]; then