python - psycopg2 error: DatabaseError: error with no message from the libpq -


i have application parses , loads data csv files postgres 9.3 database. in serial execution insert statements/cursor executions work without issue.

i added celery in mix add parallel parsing , inserting of data files. parsing works fine. however, go run insert statements , get:

[2015-05-13 11:30:16,464:  error/worker-1] ingest_task.work_it: exception     traceback (most recent call last):     file "ingest_tasks.py", line 86, in work_it         rowcount = ingest_data.load_data(con=con, statements=statements)     file "ingest_data.py", line 134, in load_data         ingest_curs.execute(statement)     databaseerror: error no message libpq

i encountered similar problem when multiprocessing engine.execute(). solved problem adding engine.dispose() right in first line under function subprocess supposed enter, suggested in official document:

when program uses multiprocessing or fork(), , engine object copied child process, engine.dispose() should called engine creates brand new database connections local fork. database connections not travel across process boundaries.


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