common/logging.py used hardcoded 'data/logs/{debug,info}/' paths,
which forced logs into the same dir as connections.json. Operators
couldn't put logs on a dedicated volume or a different disk for
retention policy reasons.
Now the base log dir comes from settings.log_dir (env var
SPARK_EXECUTOR_LOG_DIR, default <data_dir>/logs). Subdirs debug/ and
info/ are auto-created. Same behavior in dev (./data/logs/), but in
prod you can do:
SPARK_EXECUTOR_LOG_DIR=/var/log/spark-executor # dedicated volume
SPARK_EXECUTOR_LOG_DIR=/mnt/slow-storage/logs # cold storage for old logs
Other changes:
- .env.example: new SPARK_EXECUTOR_LOG_DIR entry, split into its own
'Loguru file sinks' section
- docker-compose.yml: forwards SPARK_EXECUTOR_LOG_DIR with the
container-side default /app/data/logs (the existing ./data:/app/data
volume mount already covers this)
- common/config.py: Settings gets a new log_dir field, defaults
derived from data_dir; reload() also resets it
116/116 still pass. Live smoke verified: with
SPARK_EXECUTOR_LOG_DIR=/tmp/spark-logs, both
/tmp/spark-logs/info/2026-06-25.log
/tmp/spark-logs/debug/2026-06-25.log
are created on the first request.
Before: SPARK_EXECUTOR_DATA_DIR, SPARK_EXECUTOR_JOBS_DIR, and
YARN_RESOURCE_MANAGER_URL were each read directly via os.environ.get()
inside the module that used them. Log level was hardcoded DEBUG in
common/logging.py. There was no single file showing what the full set
of env vars the app reads is.
After: common/config.py defines a single Settings dataclass that
reads all env vars at import time and exposes them as fields on a
module-level singleton. App code uses "from common.config import
settings; settings.data_dir" etc. New SPARK_EXECUTOR_LOG_LEVEL env
var controls stderr + info file verbosity (debug file always gets full
DEBUG).
Improvements:
- One file lists every env var the app reads (was: grep the codebase)
- Tests can monkeypatch fields on the settings singleton directly
instead of monkeypatching the env + reloading
- Adding a new env var means adding one field in config.py, not
editing 3+ call sites
- settings.reload() method for tests that prefer env-var style
Out of scope (kept where they are):
- GUNICORN_* env vars live in gunicorn.conf.py (gunicorn concept)
- PYTHONUNBUFFERED in Dockerfile (Python runtime flag)
- SPARK_SUBMIT_OPTS not in config (JVM flag, not Python)
Test changes:
- test_job_writer.py: settings.jobs_dir instead of monkeypatching
SPARK_EXECUTOR_JOBS_DIR
- test_yarn_client.py: settings.yarn_resource_manager_url instead of
monkeypatching YARN_RESOURCE_MANAGER_URL
- test_generate_tool.py: same as job_writer
- Each test file gets an autouse fixture that snapshots+restores
settings so one test mutation does not leak into the next
116/116 still pass. Live verified: SPARK_EXECUTOR_LOG_LEVEL=INFO
suppresses DEBUG loguru output as expected.
Claude