[google-appengine] Exceeded soft memory limit using key()

[H.N.]

Hi everyone,

My program has a problem look like memory leak (log: Exceeded soft
memory limit). I find it is the result of instance methods key() of
Model Class. Algorithm as below:


def post(self):
    """/queue_task/get_key
        Get all entity key of ModelA
    """
    entityList = []
    cursor = self.request.get('cursor', '')

    query = ModelA.all().all()
    if cursor:
        query.with_cursor(cursor)
    queryResult = query.fetch(1000)
    for entity in queryResult:
        entityList.append(entity.key().__str__())

    # save entityList into datastore

    taskqueue.add(url='/queue_task/get_key',
                  params={'cursor': query.cursor()},
                  queue_name='task',
                  target='backendA')

The usage memory will increase (all task run in one backend instance)
and exceeded soft memory limit finally. If I replace entity.key() with
some variable or string, it is work successfully. What happens in this
code or key() of Model Class??

Thanks

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