Hello,
I've been unable to shake 'MySQL has gone away' errors in my application.
Here's my setup:
It's a pretty classic REST API built on top of Flask and MySQL with a
scoped_session
engine = create_engine('mysql+mysqldb:/********',
convert_unicode=True,
pool_size=3,
pool_recycle=60)
db_session = scoped_session(sessionmaker(autocommit=False,
autoflush=False,
bind=engine))
However, I also have another component of the project that runs
continuously in the background and occasionally acts upon the same data
model. Its using the same session initialization code. Basically, every
couple seconds I check the data model and occasionally spawn off a new
thread that retrieves external data and updates the database accordingly.
I assumed that scoped_session would just handle all this automatically,
but I'm getting 'Gone Away' errors and mysql processlist seems to show that
the connections are not being recycled (as this goes on I rack up more
connections and their times do not reset). I've tried a variety of pool
sizes and recycle intervals.
Thanks for your help,
Lucas
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