[jira] [Created] (SLIDER-1178) add a feature that perform rolling upgrade automatically

["kyungwan nam (JIRA)" <ji...@apache.org>]

kyungwan nam created SLIDER-1178:
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             Summary: add a feature that perform rolling upgrade automatically
                 Key: SLIDER-1178
                 URL: https://issues.apache.org/jira/browse/SLIDER-1178
             Project: Slider
          Issue Type: Improvement
            Reporter: kyungwan nam


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.



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