title: Couchbase Metadata overhead warning
body: <p>I have a Couchbase (v 2.0.1) cluster with the following specifications:</p>
  
  <ul>
  <li>5 Nodes</li>
  <li>1 Bucket</li>
  <li>16 GB Ram per node (80GB Total)</li>
  <li>200GB Disk per node (1Tb Total)</li>
  </ul>
  
  <p>Currently I have 201.000.000 documents in this bucket and only 200GB of disk in use.</p>
  
  <p>I'm getting the following warning every minute for every node:</p>
  
  <pre><code>Metadata overhead warning. Over 51% of RAM allocated to bucket "my-bucket" on node "my-node" is taken up by keys and metadata. 
  </code></pre>
  
  <p>The Couchbase documentation states the following:</p>
  
  <blockquote>
    <p>Indicates that a bucket is now using more than 50% of the allocated
    RAM for storing metadata and keys, reducing the amount of RAM
    available for data values.</p>
  </blockquote>
  
  <p>I understand that this could be a helpful indicator that I may need to add nodes to my cluster but I think this should not be necessary given the amount of resources available to the bucket.</p>
  
  <p>General Bucket Analytics:
  <img src="https://i.stack.imgur.com/PkosS.png" alt="General Bucket Analytics"></p>
  
  <p>How could I know what is generating so much metadata?</p>
  
  <p>Is there any way to configure the tolerance percentage?</p>