[jira] [Created] (SAMZA-817) Add metrics to gauge effectiveness of host-affinity solution

["Navina Ramesh (JIRA)" <ji...@apache.org>]

Navina Ramesh created SAMZA-817:
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             Summary: Add metrics to gauge effectiveness of host-affinity solution
                 Key: SAMZA-817
                 URL: https://issues.apache.org/jira/browse/SAMZA-817
             Project: Samza
          Issue Type: Sub-task
    Affects Versions: 0.10.0
            Reporter: Navina Ramesh
            Assignee: Navina Ramesh


We wanted to reduce to container start-up time for jobs that have large change logs. There is no metric to measure this. 
Additionally, Yarn host-affinity makes a best-effort  to run a container in the requested host. There is no metric to measure this either.

Proposal:
Since task store restoration takes up most of the time during a container start-up time, we can measure the time to restore task stores. It may also help identify data distribution among the task stores. To measure "host-affinity" itself on Yarn, we can add a gauge for the ratio of container requests that is successfully matched to the requested host to the total container requests.



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