In other words, what does a parallelism value of 5 and a priority value of 1000 mean?
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They impact how and when your job can run. Priority determines in which order a job can run in relation to other queued jobs, parallelism sets how many parallel processes are started for it (more means it runs faster but costs more)
https://learn.microsoft.com/en-us/azure/data-lake-analytics/data-lake-analytics-manage-use-portal
Priority
Lower number has higher priority. If two jobs are both queued, the one with lower priority runs first
The default value is 1000 for this.
Parallelism
Max number of compute processes that can happen at the same time. Increasing this number can improve performance but can also increase cost.
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