[SLIDER-600] RoleHistory to support reloads with different # of roles from current set

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Slider 0.60
• Fix Version/s: Slider 0.80
• Component/s: appmaster
• Sprint: Slider Feb #1, Slider April #1
• Assignee: Steve Loughran
• Reporter: Steve Loughran
• Created: 01/Nov/14 13:08
• Updated: 09/Apr/15 12:43
• Resolved: 09/Apr/15 12:36

Description

The role history won't reload historical placement data if the no. of roles doesn't match what it saved. It only persists numeric values and can't rebuild the information.

This means if you add a new role to a cluster: no recovery of any previous placement

It could persist the names -> priorities of each role, and reload the positions of those roles about which there are currently records, ignoring the rest.

Issue Links

• is depended upon by: SLIDER-849 role history reload to act on names:ID map persisted in history JSON