GCP 数据存储区 Python - InvalidArgument：400 非事务性提交可能不包含影响同一实体的多个突变

Question

I have a Cloud Run application that writes to records to Cloud Datastore periodically. Each record has the same key every time, so I am updating the record when writing.
The problem is that this application gets a lot of requests and hence autoscales. When all these autoscaled instances write to the Cloud Datastore, sometimes they all attempt it at the same time and that is when I see exception mentioned below:

google.api_core.exceptions.InvalidArgument: 400 A non-transactional commit may not contain multiple mutations affecting the same entity.

Below is a skeleton code of the upload function.

def datastore_upload(records: list):
    client = datastore.Client()
    kind = "some_kind"
    entities = []
    for record in records:
        name = record['name']
        key = client.key(kind, name)
        task = datastore.Entity(key=key)
        task['x'] = record['x']
        task['y'] = record['y']
        entities.append(task)
    client.put_multi(entities)

Answer 1

You can easily work around this issue by tracking which entities are being updated, eg

def datastore_upload(records: list):
    client = datastore.Client()
    kind = "some_kind"
    entities = {}
    for record in records:
        name = record['name']
        key = client.key(kind, name)
        task = datastore.Entity(key=key)
        task['x'] = record['x']
        task['y'] = record['y']
        # Keep the last update for each task.
        entities[name] = task
    client.put_multi(list(entities.values()))