If Amazon Route 53 can't process a request before the next request arrives, it will
reject subsequent requests for the same hosted zone and return an HTTP 400
error (Bad request). If Route 53 returns this error repeatedly
for the same request, we recommend that you wait, in intervals of increasing duration,
before you try the request again.
If Amazon Route 53 can't process a request before the next request arrives, it will reject subsequent requests for the same hosted zone and return an
HTTP 400 error(Bad request). If Route 53 returns this error repeatedly for the same request, we recommend that you wait, in intervals of increasing duration, before you try the request again.