[SLIDER-1178] add a feature that perform rolling upgrade automatically

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Fix Version/s: Slider 1.0.0
• Assignee: kyungwan nam
• Reporter: kyungwan nam
• Created: 11/Dec/16 04:38
• Updated: 08/Mar/17 23:03

Description

currently, when we want to upgrade a slider app, each containers should be restarted manually.
this makes upgrading very inconvenient.

I propose the AutoRollingUpgrader.

• the AutoRollingUpgrader is a thread running periodically.
• if container’s appVersion is different from that Slider-AM know, the container will be restarted.
• to avoid application down, container should be restarted one at a time.
• configurations should be added as follows
  site.global.auto_rolling_upgrade_enabled: if this is set to true, the AutoRollingUpgrader is enabled.
  site.global.auto_rolling_upgrade_interval: the interval in milliseconds at which the AutoRollingUpgrader runs.

upgrade scenario when the AutoRollingUpgrader is enabled

1. user write a new appConfig file including changed “site.global.app_version"
2. user execute "slider upgrade" command with new appConfig.
3. slider-AM is killed and new slider-AM is launched with new appConfig.
4. new Slider-AM reregister with previous containers.
5. containers that have old appVersion are restarted by the AutoRollingUpgrader.

a user want to upgrade only need to do 1,2.