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Intro

Executing statements periodically can be usefull in

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• The metastore maintains the scheduled queries in the metastore database
• The Hiveserver(s) periodically polls the metastore for a scheduled query to be executed
• During execution informations about ongoing/finished executions are kept in the metastore to help  

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• metastore.scheduled.queries.enabled (default: true)
  Controls the metastore side support for scheduled queries; forces all HMS scheduled query related endpoints to return with an error
• metastore.scheduled.queries.execution.timeout (default: 2 minutes)
  In case a scheduled execution is not updated for at least this amount of time; it’s state will be changed to TIMED_OUT by the cleaner task
• metastore.scheduled.queries.execution.maint.task.frequency (default: 1 minute)
  Interval of scheduled query maintenance task. Which removes executions above max age; and marks executions as TIMED_OUT if the condition is met
• metastore.scheduled.queries.execution.max.age (default: 30 days)
  Maximal age of a scheduled query execution entry before it is removed.

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