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Add RetryJob exception to force a job retry #24
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…ction from gearman server & subsequent job retry
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Our current strategy for retrying work that fails because of transient issues (eg a DB error) is to sys.exit the worker and thus force gearman to retry the job. To avoid having to re-import and re-start the Python process, we added a custom Exception that can be thrown if the job is known to have failed for transient reasons.