Parallel extract and load with synchronization

<?xml version="1.0" encoding="UTF-8"?>
<scenario>
     <name>Extract and load data in parallel threads with synchronization.</name>
     <description>Extracts and loads data in parallel threads with synchronization. Creates tables if needed.</description>
     <script>extract_load_parallel_with_synch</script>
     <driver>auto</driver>
     <sources>
          <source parallel="true">
               <name>employee</name>
               <extract>
                    <sql>select * from employee</sql>
               </extract>
          </source>

<source parallel="true">
               <name>emp_resume</name>
               <extract>
                    <sql>select * from emp_resume</sql>
               </extract>
          </source>

<source empty="true">
               <name>wait</name>
          </source>

<source parallel="true">
               <name>emp_photo</name>
               <extract>
                    <sql>select * from emp_photo</sql>
               </extract>
          </source>
          
     </sources>
     <destinations>
          <destination parallel="true">
               <name>employee</name>
               <metadata>yes</metadata>
          </destination>

<destination parallel="true">
               <name>emp_resume</name>
               <metadata>yes</metadata>
          </destination>

<destination type="wait">
              <name>wait</name>
          </destination>

<destination parallel="true">
               <name>emp_photo</name>
               <metadata>yes</metadata>
          </destination>
          
     </destinations>
</scenario>