[MAPREDUCE-1306] [MUMAK] Randomize the arrival of heartbeat responses

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.21.0, 0.22.0
• Fix Version/s: 0.21.0
• Component/s: contrib/mumak
• Hadoop Flags: Reviewed
• Release Note: [MUMAK] Randomize the arrival of heartbeat responses
• Assignee: Tamas Sarlos
• Reporter: Tamas Sarlos
• Created: 16/Dec/09 23:38
• Updated: 24/Aug/10 21:19
• Resolved: 11/Mar/10 02:38

Description

We propose to make the following changes to mumak, MAPREDUCE-728

• make the timing of heartbeat responses more realistic by adding an option to randomly perturb them
• randomize the startup time of task trackers in a fixed interval
• remove 2 magic constants from SimulatorEngine and make sure that the first job is submitted only after the entire cluster is up and running