We are using sequel 4.49.0 with delayed_job 4.1.9.
Ubuntu 20.04
Ruby 2.6.4
Rvm 1.29.12
When we include a logger in the delayed_job startup script the job
succeeds. When we do not include a logger in the delayed_job startup
script we get the error (full stack attached):
Mysql2::Error: Got packets out of order
The mysql2 team wrote back with:
You may be sharing a single connection between multiple threads or child
processes; this can be OK as long as you manage locking. Each database
connection is stateful, so you have to make sure that it goes through a
complete login-query-fetchresults-freeresults cycle before another thread
can use it.
The mysql2 gem does not have a database connection pool manager built-in,
usually people use ActiveRecord for this purpose. I'm not as familiar with
Sequel, but it should have something to help manage a connection pool.
When a delayed_job worker is launched I see two threads start and go away
when the job is completed.
Below is a snippet of the delayed_job startup script with the logger.
Sequel.connect(db_config)
logger = Logger.new('/var/log/adhearsion/test.log')
Delayed::Worker.backend = :sequel
Delayed::Worker.destroy_failed_jobs = false
Delayed::Worker.sleep_delay = 10
Delayed::Worker.max_attempts = 15
Delayed::Worker.max_run_time = 1.hour
arguments = ['--pid-dir=/var/run/adhearsion', '--log-dir=/tmp',
"--queue=#{this_host}"]
arguments.concat(ARGV)
Delayed::Command.new(arguments).daemonize
I'm perplexed as to why the inclusion of a logger allows the delayed_job to
succeed. Also, I'm not sure whether this is a sequel or delayed_job
issue. Any information you can provide would be greatly appreciated.
Thanks
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Mysql2::Error: Got packets out of order
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`_query'
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`query'
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`block in log_connection_execute'
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`log_connection_yield'
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`begin_new_transaction'
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`begin_transaction'
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`block in synchronize'
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`hold'
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`synchronize'
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`transaction'
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`checked_transaction'
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`block in destroy'
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`checked_save_failure'
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`destroy'
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`block in run'
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`run'
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`block in reserve_and_run_one_job'
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`execute'
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`run_callbacks'
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`reserve_and_run_one_job'
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`block in work_off'
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`times'
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`work_off'
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`block (4 levels) in start'
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`block in initialize'
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`block in start'
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`block (2 levels) in <class:ClearLocks>'
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`run'
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`block in run_process'
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`block in start_proc'
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`run'
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`<class:CLI>'
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`<module:DelayedJob>'
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`<module:AdhearsionModels>'
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`<top (required)>'
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`<main>'
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`eval'
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`<main>'
