链接错误作为芹菜链

Question

我有一个功能，我开始一个示例作业并相应地更新数据库。我的功能是这样的：

def schedule_sample_job(hosts):
       parent_job_id = 'SampleBatchJob|%s|Phantom' % uuid.uuid1()
       child_jobs = []
       host_entries = []
       for host in hosts:
           job_id = 'SampleJob|%s|Phantom' % uuid.uuid1()
           res = chain(
              add.si(2, 2),
              add.si(3, 3),
              throw_exception.si('4'),
              mul.si(4, 4),
              mul.si(5, 5)
           )
           capacity_task = res.apply_async(
               serializer='json',
               link=[change_job_status.s(job_id, 'SUCCESS')],
               link_error=[change_job_status.s(job_id, 'FAILED'), change_parent_job_status.s(parent_job_id)]
           )
           host_entry = {'host': host}
           host_entries.append(host_entry)
           celery_util = CeleryUtil()
           celery_util.store_chain_job(
               job_id,
               capacity_task,
               parent_job_id,
               'anonymous',
               [host_entry]
           )
           child_jobs.append(job_id)

      celery_util = CeleryUtil()
      celery_util.store_chain_job(parent_job_id, child_jobs, None, 'anonymous', host_entries)
      job_status = celery_util.build_job_status(parent_job_id)
      return job_status

正如您所看到的，我尝试为每个主机启动一项工作，并在link_error中有多个任务，我希望这就像一个链，其中一个任务执行后另一个完成执行。这在我的程序中不会发生这种情况。任何帮助将受到高度赞赏。