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From "Alejandro Abdelnur (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-10802) Add metrics for KMS client and server encrypted key caches
Date Mon, 04 Aug 2014 13:40:12 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-10802?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14084654#comment-14084654

Alejandro Abdelnur commented on HADOOP-10802:

i've browsed the patch, the approach looks good. just not sure about the captured metrics.

IMO, we shouldn't capture per key metrics. knowing a key is request more than others, I don't
think brings much. 

i would keep track of going below watermarks and refill requests and I would log the key names.

> 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
>         Attachments: HADOOP-10802.WIP.patch
> 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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