he local filesystem because HDFS does not feature data co-location and might move file blocks across data nodes. That means you need to take care of many things yourself which HDFS would have done for you, including replication to avoid data loss. On the other hand, performance gains of joining co-located and pre-sorted can be quite substantial.</p>
<h3 id="tldr-what-should-i-remember-from-all-of-this">
  tl;dr: What should I remember from all of this?
  <a class="anchor" href="#tldr-what-should-i-remember-