title: How to suppress garbage collection output in spark-submit
body: <p>When submitting jobs via spark-submit, the console scrolls with the output below. 
  How can this be disabled? </p>
  
  <pre><code>63.864: [GC 2382251K-&gt;1247626K(3637248K), 0.0089420 secs]
  64.370: [GC 2404234K-&gt;1259517K(3636736K), 0.0090540 secs]
  </code></pre>
  
  <p>The python script prints other [useful] output that I want to focus on.</p>