repeating order hang after first execution

This issue occurs in the version 1.7.4177, where if a user has a job_chain with a shell job as its first node and has only one repeating order i.e. repeat="00:02", the order will run a first time and second time it will just hang without giviing out an error or a warning.

To reproduce the problem (see also attached example file)

1. create a job_chain i.e. job_chain1
2. create a shell job i.e. job1 shell command echo "hello world"
3. create an order i.e. order id 1, everyday begin="00:00", end="24:00", repeat="00:02"

The order will run first time but second time It will just hang.

Some workarounds :

1. Recommended solution
   Change microscheduling to old microscheduling engine for the JobScheduler .
   For this add the following parameter into the ./config/scheduler.xml and restart the JobScheduler.

   ...
        <params>
            ...
            <param name="scheduler.old_microscheduling.enable_for_jobs" value="true"/>
        </params>
   ...
   

2. Make the first job node an API job or give the shell job a monitor script.

    <?xml version="1.0" encoding="ISO-8859-1"?>
    <job  order="yes" stop_on_error="no">
       <script  language="shell"><![CDATA[
   echo "Hello World!!!"
    ]]></script>
       <monitor  name="js-1172-workaround" ordering="0">
           <script  language="javascript"><![CDATA[
   function spooler_task_before() {
   	return true;
   }
     ]]></script>
       </monitor>
       <run_time />
   </job>
   

3. Create more than one order with a run_time assigned to the job_chain.