[YARN-6460] Accelerated time in SLS

• Type: Improvement
• Status: Patch Available
• Priority: Minor
• Resolution: Unresolved
• Component/s: scheduler-load-simulator
• Assignee: Julien Vaudour
• Reporter: Julien Vaudour
• Created: 10/Apr/17 16:13
• Updated: 15/Oct/17 09:54

Description

Be able to accelerate time in SLS.To do that, a timescalefactor parameter is introduced (default value = 1)
With if we use a time factor of X, time in simulation will be X times faster than real. Time in generated CSV will be modified a well to have the same result as if we don't use timescalefactor.

For example, it permits to run a simulation of one week of jobs in just one day if we use timescalefactor=7

To do that a ScaleClock object has been introduced, which implements org.apache.hadoop.yarn.util.Clock. It also extends com.codahale.metrics.Clock for metrics reported in csv.
All objects used for the simulation now use a shared reference to a org.apache.hadoop.yarn.util.Clock instance to get current time instead of using System.currentTimeMillis()

A new optionnal parameter --timescalefactor=<factor> has been introduced on slsrun.sh script.