tree 78d5facac929ba8e4678e30581529315a8c45ae5
parent 4e28e73bb83b75f1369a705d15c96e40fb7098e1
author Jordan Ly <jordan.ly8@gmail.com> 1532646076 -0700
committer Jordan Ly <jly@twitter.com> 1532646076 -0700

Add size metric for memory stores, add MemSchedulerStoreTest

Currently, we only track the size metrics for:
- # of tasks via `task_store_index_(host|job)`
- # of crons via `mem_storage_cron_size`

I am hoping to add:
- # of attributes via `mem_storage_attributes_size`
- # of maintenance requests via `mem_storage_maintenance_size`
- # of job updates via `mem_storage_update_size`
- # of quotas via `mem_storage_quota_size`

This will help us track the growth of stores over time. Additionally, I added
a `MemSchedulerStoreTest` since one did not exist previously and nothing was
extending the abtract version of the test.

Reviewed at https://reviews.apache.org/r/68047/