[SLIDER-825] strict placement should skip the de-affinitisation process

• Type: Sub-task
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: Slider 0.70
• Fix Version/s: Slider 1.0.0
• Component/s: appmaster
• Assignee: Steve Loughran
• Reporter: Steve Loughran
• Created: 19/Mar/15 14:09
• Updated: 29/Apr/15 17:05

Description

The strict placement rules are only used after the role history scan has filtered the placement history to discard nodes more than once. This may not be what strict placement prefers.

There's a couple of problems implementing this.

1. persistence only logs whether a node was used or not; the saved data format would need to be extended with a new optional field of placement count.
2. on a clean teardown the history is saved too many times, and will log a reduced placement count as the cluster shrinks.

It may be that the slider-managed escalation of SLIDER-799 renders strict placement moot -or it may be that the behaviour proposed in this JIRA is desired there too.