title: Aerospike Hot Key error
body: <p>Based on this <a href="https://discuss.aerospike.com/t/hot-key-error-code-14/986" rel="nofollow">link</a>, I understood that hotkey error happens when there are too many concurrent operation requests for the same key.</p>
  
  <p>My current scenario:</p>
  
  <p>I have a record which will get updated in every 5-10 seconds interval and I will have around 20 machines each with 10K Queries per second tries to read that record</p>
  
  <ul>
  <li>Question 1 : Hotkey error will happen only when there are concurrent update transactions or it can happen for concurrent reads also?</li>
  <li>Question 2 : The transaction-pending-limit mentioned in the above link is it per node in the cluster or for the overall cluster limit?</li>
  <li>Question 3 : Based on my reading we should not increase transaction-pending-limit because it will impact performance, can you tell me some performance numbers to compare? And what is the maximum value that can be used for transaction-pending-limit?</li>
  <li>Question 4 : Is there any workaround for my scenario without impacting the performance other than caching the record in the server?</li>
  </ul>