title: MemSQL: Leaf error: timed out from socket after -1 seconds
body: <p>We are running a 4 node cluster currently, (3 machines with 8GB and one with 4GB RAM) and while trying run a left outer join of a table (about 7.5 GB) on itself. Few of the fields of the table have been stored as columnstore.
  The structure of the query is somewhat like:</p>
  
  <pre><code>SELECT a.x, a.y from tableX left outer join tableY on a.z=b.z group by a.x;
  </code></pre>
  
  <p>Any ideas?</p>