A runtime system for NMDC data management and orchestration.

Service Status

http://nmdcstatus.polyneme.xyz/

How It Fits In

• issues
  tracks issues related to NMDC, which may necessitate work across multiple repos.

• nmdc-schema houses the LinkML schema specification, as well as generated artifacts (e.g. JSON Schema).

• nmdc-server houses code specific to the data portal -- its database, back-end API, and front-end application.

• workflow_documentation references workflow code spread across several repositories, that take source data and produce computed data.

• This repo (nmdc-runtime)

  • houses code that takes source data and computed data, and transforms it to broadly accommodate downstream applications such as the data portal
  • manages execution of the above (i.e., lightweight data transformations) and also of computationally- and data-intensive workflows performed at other sites, ensuring that claimed jobs have access to needed configuration and data resources.

Data exports

The NMDC metadata as of 2021-10 is available here:

https://drs.microbiomedata.org/ga4gh/drs/v1/objects/sys086d541

The link returns a GA4GH DRS API bundle object record, with the NMDC metadata collections (study_set, biosample_set, etc.) as contents, each a DRS API blob object.

For example the blob for the study_set collection export, named "study_set.jsonl.gz", is listed with DRS API ID "sys0xsry70". Thus, it is retrievable via

https://drs.microbiomedata.org/ga4gh/drs/v1/objects/sys0xsry70

The returned blob object record lists https://nmdc-runtime.files.polyneme.xyz/nmdcdb-mongoexport/2021-10-14/study_set.jsonl.gz as the url for an access method.

The 2021-10 exports are currently all accessible at https://nmdc-runtime.files.polyneme.xyz/nmdcdb-mongoexport/2021-10-14/${COLLECTION_NAME}.jsonl.gz, but the DRS API indirection allows these links to change in the future, for mirroring via other URLs, etc. So, the DRS API links should be the links you share.

Overview

The runtime features:

1. Dagster orchestration:

   • dagit - a web UI to monitor and manage the running system.
   • dagster-daemon - a service that triggers pipeline runs based on time or external state.
   • PostgresSQL database - for storing run history, event logs, and scheduler state.
   • workspace code
     • Code to run is loaded into a Dagster workspace. This code is loaded from one or more dagster repositories. Each Dagster repository may be run with a different Python virtual environment if need be, and may be loaded from a local Python file or pip installed from an external source. In our case, each Dagster repository is simply loaded from a Python file local to the nmdc-runtime GitHub repository, and all code is run in the same Python environment.
     • A Dagster repository consists of solids and pipelines, and optionally schedules and sensors.
       • solids represent individual units of computation
       • pipelines are built up from solids
       • schedules trigger recurring pipeline runs based on time
       • sensors trigger pipeline runs based on external state
     • Each pipeline can declare dependencies on any runtime resources or additional configuration. There are MongoDB resources defined, as well as preset configuration definitions for both "dev" and "prod" modes. The presets tell Dagster to look to a set of known environment variables to load resources configurations, depending on the mode.

2. A MongoDB database supporting write-once, high-throughput internal data storage by the nmdc-runtime FastAPI instance.

3. A FastAPI service to interface with the orchestrator and database, as a hub for data management and workflow automation.

Local Development

Ensure Docker (and Docker Compose) are installed; and the Docker engine is running.

docker --version
docker compose version
docker info

Ensure the permissions of ./mongoKeyFile are such that only the file's owner can read or write the file.

chmod 600 ./mongoKeyFile

Ensure you have a .env file for the Docker services to source from. You may copy .env.example to .env (which is gitignore'd) to get started.

cp .env.example .env

Create environment variables in your shell session, based upon the contents of the .env file.

set -a # automatically export all variables
source .env
set +a

If you are connecting to resources that require an SSH tunnel—for example, a MongoDB server that is only accessible on the NERSC network—set up the SSH tunnel.

The following command could be useful to you, either directly or as a template (see Makefile).

make nersc-mongo-tunnels

Finally, spin up the Docker Compose stack.

make up-dev

Docker Compose is used to start local MongoDB and PostgresSQL (used by Dagster) instances, as well as a Dagster web server (dagit) and daemon (dagster-daemon).

The Dagit web server is viewable at http://127.0.0.1:3000/.

The FastAPI service is viewable at http://127.0.0.1:8000/ -- e.g., rendered documentation at http://127.0.0.1:8000/redoc/.

Local Testing

Tests can be found in tests and are run with the following commands:

make up-test
make test

As you create Dagster solids and pipelines, add tests in tests/ to check that your code behaves as desired and does not break over time.

For hints on how to write tests for solids and pipelines in Dagster, see their documentation tutorial on Testing.

Publish to PyPI

This repository contains a GitHub Actions workflow that publishes a Python package to PyPI.

You can also manually publish the Python package to PyPI by issuing the following commands in the root directory of the repository:

rm -rf dist
python -m build
twine upload dist/*

Links

Here are links related to this repository:

• Production API server: https://api.microbiomedata.org
• PyPI package: https://pypi.org/project/nmdc-runtime
• DockerHub image (API server): https://hub.docker.com/r/microbiomedata/nmdc-runtime-fastapi
• DockerHub image (Dagster): https://hub.docker.com/r/microbiomedata/nmdc-runtime-dagster