fails to get the MilvusHelper object

[akimisr]

Describe the issue
My Milvus often fails to get the MilvusHelper object.At that time,I had to reinstall Milvus.This problem happens frequently.

To Reproduce

• Which solution are you running? Please post the link.
• Steps to reproduce the behavior(Docker or Source code):

1. Start standalone milvus2.0
2. Start reverse_image_search
3. Vist 127.0.0.1:5010/docs
4. Try to load or search some images
5. See an error

Expected behavior
Can always get milvushelper object.

Screenshots
Traceback (most recent call last):
File "/home/vector/milvus2.0/quick_deploy/server/src/milvus_helpers.py", line 59, in insert
mr = self.collection.insert(data)
AttributeError: 'NoneType' object has no attribute 'insert'

Additional context
Sometimes I use load.py from outside, which may be related to the problem.

[shiyu22]

Are there any logs in the server? Before calling the collection.insert function, we will first create a collection, you can view the code, so it may fail when creating the collection.

This error means that the collection object is None, please double check whether your Milvus server is running successfully :)

[akimisr]

Are there any logs in the server? Before calling the collection.insert function, we will first create a collection, you can view the code, so it may fail when creating the collection.

This error means that the collection object is None, please double check whether your Milvus server is running successfully :)

Only the log showing the normal operation of server.I just use the code of MilvusHelper in object-search to create a collection.I think the error means Milvus server is not running.

[shiyu22]

I think you are right, so how is your Milvus server?

[shiyu22]

same to #643