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• 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, stopped, killed, failed, success, etc.
• scheduler should retry other some failed jobs for some casesto reduce failure ratio.
• coordinate recording/evaluating/alerting tasks within job(workflow).
• query the status of a job (running, failed, finished, etc), and its execution histories
• prioritize a job. 
• high available, so that one scheduler node is down, jobs(including half-done jobs) can failover to another node.
• elastic, or work load balanced between works.
• except time-based trigger, we also need to support event-based-trigger.

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