title: DynamoDB: High SuccessfulRequestLatency
body: <p>We had a period of latency in our application that was directly correlated with latency in DynamoDB and we are trying to figure out what caused that latency.</p>
  
  <p>During that time, the consumed reads and consumed writes for the table were normal (much below the provisioned capacity) and the number of throttled requests was also 0 or 1. The only thing that increased was the SuccessfulRequestLatency.</p>
  
  <p>The high latency occurred during a period where we were doing a lot of automatic writes. In our use case, writing to dynamo also includes some reading (to get any existing records). However, we often write the same quantity of data in the same period of time without causing any increased latency.</p>
  
  <p>Is there any way to understand what contributes to an increase in SuccessfulRequest latency where it seems that we have provisioned enough read capacity? Is there any way to diagnose the latency caused by this set of writes to dynamodb?</p>