title: Amazon DynamoDB :- Invalid UpdateExpression: Expression size has exceeded the maximum allowed size dynamodb
body: <p>I am trying to update an item in was dynamoDB using nodes, db.updateItem(query).</p>
  
  <p>I am getting the following error : </p>
  
  <pre><code>Invalid UpdateExpression: Expression size has exceeded the maximum allowed size dynamodb
  </code></pre>
  
  <p>On reading few posts, I realised that dynamoDB allows itemSize to be 400KB and that might be a problem here. But if that is the problem, why did it allow to insert the item in the first place. </p>
  
  <p>I am not sure what exactly the issue. Any help would be appreciated.</p>
  
  <p>Please let me know if I missed any required information</p>