Why when upgrade gearman python package from 'gearman(2.0.2)' to 'gearman3(0.2.0)', sometimes job missed and delayed

Question

We often used the following code to connect to gearman server to get job:

gm_worker = gearman.GearmanWorker([\'localhost:4730\'])
gm_worker.set_client_id(\'xxxwor