Python 使用django通道、apscheduler和google oauth2client的内存泄漏

我的代码每X秒提取一次数据，并通过将其推送到WebSocket前端。我正在使用在指定间隔上运行tick函数。但是当我运行它时，即使我所做的只是授权oauth API，内存使用量也会以相当稳定的速度增长。consumers.py中的示例代码：

from channels.sessions import channel_session
from apscheduler.schedulers.background import BackgroundScheduler
from oauth2client import transport
from apiclient.discovery import build

scheduler = BackgroundScheduler()

def tick(group_id):
    user = GoogleUser.objects.all()[0]
    # gets DjangoORMStorage instance
    credentials = get_credentials(user).get() 

    # THESE TWO LINES SEEM TO CAUSE THE MEMORY LEAK
    oauth_http = credentials.authorize(transport.get_http_object())
    analytics = build('analytics', 'v3', http=oauth_http)

@channel_session
def ws_connect(message):
    # accept socket connection and add channel to group
    message.reply_channel.send({"accept": True})

    # add channel to websocket channel group
    redis_group = Group(group_id, channel_layer=None)
    redis_group.add(message.reply_channel)

    # schedule job
    scheduler.add_job(tick, 'interval', id=slug, kwargs={
        'group_id': group_id,
    }, seconds=settings.INTERVAL)
    scheduler.start()