title: Docker containers: drop cache without root - other options?
body: <p>I'm doing some query tests with Impala/HDFS inside docker containers (swarm). In order to compare the queries (different scale factors), I want to drop the cache. Normally this is easily done by </p>
  
  <pre><code>$ sync
  $ echo 1 &gt; /proc/sys/vm/drop_caches
  </code></pre>
  
  <p>but I don't have admin rights on the host system. Is there another way to drop the cache from the inside of the containers? Is it an option to create another big table and execute queries on this table so that its data overwrite the cache?</p>