title: Rate exceeded in throttling is thrown on DescribeJobFlows
body: <p>Several days ago all went well, but now, not just one, but three of our servers are throwing these exceptions:</p>
  
  <p><code>
  {
    "Error" =&gt; {
      "Message" =&gt; "Rate exceeded",
      "Code" =&gt; "Throttling",
      "Type" =&gt; "Sender"
    }
  }
  </code></p>
  
  <p>This happens when retrieving data from Amazon, while calling <code>DescribeJobFlows</code> on <code>Amazon::Coral::ElasticMapReduceClient</code>, and shows as NFO Exception Retriable invalid response.</p>