How to run privateGPT in kubernetes with HA (2 replicas)?

[minixxie]

Discussed in #1558

^{Originally posted by minixxie January 30, 2024}
Hello,

First thank you so much for providing this awesome project!
I'm able to run this in kubernetes, but when I try to scale out to 2 replicas (2 pods), I found that the documents ingested are not shared among 2 pods.

First, I found the data being persisted in "local_data/" folder, so I found the doc and spin up qdrant, and change the settings.yaml as follow:

    qdrant:
      #path: local_data/private_gpt/qdrant
      prefer_grpc: false 
      host: qdrant.qdrant.svc.cluster.local

I saw the log of the pod showing the check on qdrant was successful:

08:54:27.979 [INFO    ]                     httpx - HTTP Request: GET http://qdrant.qdrant.svc.cluster.local:6333/collections/make_this_parameterizable_per_api_call "HTTP/1.1 200 OK"

After I ingested the doc inside the 1st pod:

worker@private-gpt-58fccb48c6-l2m4q:/home/worker/app$ curl -X POST --url "http://localhost:8080/v1/ingest/text" --header "Content-Type: application/json" --header "Accept: application/json" --data '{"file_name": "Student winter uniform requirements","text": "Boys students need to wear white long sleeves shirt, and gray long pants. While girl students need to wear pale blue long sleeves shirt, and dark blue skirt. Both boys and girls need to wear a tie."}'
{"object":"list","model":"private-gpt","data":[{"object":"ingest.document","doc_id":"750a86fd-896c-4fd9-af59-fa0905a5fed9","doc_metadata":{"file_name":"Student winter uniform requirements"}}]}

I'm able to get the doc from the list endpoint:

worker@private-gpt-58fccb48c6-l2m4q:/home/worker/app$ curl -X GET --url "http://localhost:8080/v1/ingest/list" --header "Accept: application/json"
{"object":"list","model":"private-gpt","data":[{"object":"ingest.document","doc_id":"750a86fd-896c-4fd9-af59-fa0905a5fed9","doc_metadata":{"file_name":"Student winter uniform requirements"}}]}

However, if I check the list endpoint in the 2nd pod, it's empty:

worker@private-gpt-58fccb48c6-f9fj4:/home/worker/app$ curl -X GET --url "http://localhost:8080/v1/ingest/list" --header "Accept: application/json"
{"object":"list","model":"private-gpt","data":[]}

This means they are not sharing the data from the vector database? Is there any way to run it in HA mode, so all replicas share the same set of documents ingested?

docker image I'm using: 3x3cut0r/privategpt:0.2.0

3x3cut0r/privategpt                 0.2.0                   0bfaeacab058    5 hours ago    linux/arm64       6.3 GiB      4.7 GiB

OS: mac OS mac book pro (Apple M2)
runtime: colima:

PROFILE    STATUS     ARCH       CPUS    MEMORY    DISK      RUNTIME           ADDRESS
default    Running    aarch64    4       8GiB      100GiB    containerd+k3s    

[minixxie]

Seems no one came across this issue? or I'm the only person running it in 2 pods?
Today I've tried again and successfully see data saved in the qdrant database, but when I check the list of docs saved, it's sometimes returnning empty (from the 2nd pod):

curl -X GET --url "http://private-gpt.local/v1/ingest/list" --header "Accept: application/json"

{"object":"list","model":"private-gpt","data":[{"object":"ingest.document","doc_id":"227ea4a8-863f-47d3-9cbf-75aa2bebc447","doc_metadata":{"file_name":"b"}},{"object":"ingest.document","doc_id":"6392894d-1da3-4d77-abd1-7c65e5a33535","doc_metadata":{"file_name":"a"}}]}

curl -X GET --url "http://private-gpt.local/v1/ingest/list" --header "Accept: application/json"

{"object":"list","model":"private-gpt","data":[]}

After some investigation, I found that there is a data file saving the doc on harddrive:

# in POD 1
worker@private-gpt-55cb54b557-2rp2g:/home/worker/app/local_data/private_gpt$ grep -l 6392894d-1da3-4d77-abd1-7c65e5a33535 * 
docstore.json
# in POD 2
worker@private-gpt-55cb54b557-vfhdb:/home/worker/app/local_data/private_gpt$ grep -l 6392894d-1da3-4d77-abd1-7c65e5a33535 *
## <empty result>

Anyone knows how to avoid this so it can share the states across 2 pods? Thanks very much.

[minixxie]

I'm able to make it run in 2 PODs by changing the document store and index store to use MongoDB:
main...minixxie:privateGPT:dev

Not sure if this is the correct way of making it stateless.

[Anhui-tqhuang]

@minixxie hey i recently added the support to use the pgvector as the vector store #1624

which might be shared, moreover, have you used a shared PV/PVC or other storage for doc store or index store?