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From "Andrew Wang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-10802) Add metrics for KMS client and server encrypted key caches
Date Tue, 08 Jul 2014 20:28:05 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-10802?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14055458#comment-14055458
] 

Andrew Wang commented on HADOOP-10802:
--------------------------------------

A few ideas for metrics (just suggestions):

* # of times the cache is empty (0) when a request comes in
* Moving average cache size
* Some indication of peak load, e.g. max request rate over different time durations
* A histogram showing how "hot" some keyIds are compared to others, so we know how skewed
demand is

> Add metrics for KMS client and server encrypted key caches
> ----------------------------------------------------------
>
>                 Key: HADOOP-10802
>                 URL: https://issues.apache.org/jira/browse/HADOOP-10802
>             Project: Hadoop Common
>          Issue Type: Improvement
>    Affects Versions: 3.0.0
>            Reporter: Andrew Wang
>            Assignee: Arun Suresh
>
> HADOOP-10720 is adding KMS server and client caches for encrypted keys for performance
reasons. It would be good to add metrics to make sure that the cache is working as expected,
and to inform future dynamic cache sizing and refilling policies.



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