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Background

As we will move to a new data quality workflow, we also need to update griffin related scheduler to meet workflow's needs as below

• time-based schedule capability, as create job(workflow) to be run at a specified time or intervals.
• manage jobs lifecycle such as init, start, pause/resume, stop, delete, kill, retry, etc.periodically start/retry/clean workflow
• coordinate recording/evaluating/alerting tasks within workflow
• create jobs to be run at a specified time, and at specific intervals if the job requires to be run periodically.
delete or update jobs
• job(workflow).
• query the status of a job (running, failed, finished, etc), and its execution histories
• prioritize a job. 
• jobs are asynchronous.
• high availablehigh available, so that one scheduler node is down, jobs(including half-done jobs) can failover to another node.