title: Optimal number of partition for kafka topic on 5 brokers with replication factor=3 in 1 cluster
body: <p>What is optimal no. of partition for a topic that has 5 brokers and replication factor=3? 
  Total there are only 6 topics in this cluster.</p>
  
  <p>Machine configuration that each broker is running as follows.</p>
  
  <pre><code>Memory=16gb
  Porcessor= Octacore, Intel(R) Xeon(R) CPU E5-2650 v3 @ 2.30GHz
  </code></pre>
  
  <p>Any challenges other than open file for 1000 partitions per topic??</p>