title: DROP TABLE in Hive (via Spark) hangs
body: <p>My attempt to drop a HIVE table hangs and is finally killed with the exception below. I thought it might a be lock, but when I try execute the <code>SHOW LOCKS</code> statement I get another exception (<code>java.sql.SQLException: Error while processing statement: FAILED: Execution Error, return code 1 from org.apache.hadoop.hive.ql.exec.DDLTask. show Locks LockManager not specified</code>). I event went to the Hive metastore and checked the HIVE_LOCKS table, but it's empty. What else might be the issue?</p>
  
  <pre><code>18/06/06 08:07:02 WARN RetryingMetaStoreClient: MetaStoreClient lost connection. Attempting to reconnect.
  org.apache.thrift.transport.TTransportException: java.net.SocketTimeoutException: Read timed out
  </code></pre>