[SAMZA-2008] TaskNameGrouper/JobModelManager Followup.

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Fix Version/s: 1.1
• Assignee: Shanthoosh Venkataraman
• Reporter: Shanthoosh Venkataraman
• Created: 28/Nov/18 00:12
• Updated: 03/Dec/18 21:28

Description

1. Remove the in-place mutation of containerIds in `GroupByContainerIds.group(Set<TaskModel> tasks, List<String> containerIds)` . 
2. Invoke the newly introduced TaskNameGrouper method: `.group(tasks, grouper)` from the  `JobModelManager` by default. 

3. Remove empty List from BalancingTaskNameGrouper.getPreviousContainer() instead of null.