Google app engine 503错误未清除且未提供任何有用信息

我最近犯了不少这样的错误。重试似乎并不能解决问题。有时重新创建工作会有所帮助，但通常不会

我能做些什么来减少这种问题的发生频率吗？项目id是1097390039935

14:37:42.529 URL being requested: https://www.googleapis.com/discovery/v1/apis/bigquery/v2/rest?userIp=2620%3A0%3A102f%3A1004%3A1260%3A4bff%3Afe7c%3A9e95
   I 14:37:42.611 URL being requested: https://www.googleapis.com/bigquery/v2/projects/1097390039935/jobs/job_PX6Cmd6f3hE551p07zIV7NKnI6Y?alt=json
   I 14:37:42.836 URL being requested: https://www.googleapis.com/bigquery/v2/projects/1097390039935/queries/job_PX6Cmd6f3hE551p07zIV7NKnI6Y?timeoutMs=30000&startIndex=0&alt=json&maxResults=50
   E 14:37:43.038 HttpError loading bigquery results: {'status': '503', 'content-length': '221', 'x-xss-protection': '1; mode=block', 'x-content-type-options': 'nosniff', 'expires': 'Wed, 18 Jun 2014 21:37:43 GMT', 'server': 'GSE', 'cache-control': 'private, max-age=0', 'date': 'Wed, 18 Jun 2014 21:37:43 GMT', 'x-frame-options': 'SAMEORIGIN', 'content-type': 'application/json; charset=UTF-8'}/{
 "error": {
  "errors": [
   {
    "domain": "global",
    "reason": "backendError",
    "message": "Connection error. Please try again."
   }
  ],
  "code": 503,
  "message": "Connection error. Please try again."
 }
}

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您在应用程序引擎日志中看到了哪些错误？这些日志来自：-。我自己记录这些，没有其他东西是自动记录的。