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From "Xianyin Xin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-12335) Add exponential weighted moving average in metrics2.util
Date Mon, 14 Sep 2015 03:14:46 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-12335?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14742839#comment-14742839
] 

Xianyin Xin commented on HADOOP-12335:
--------------------------------------

can someone take a review?

> Add exponential weighted moving average in metrics2.util
> --------------------------------------------------------
>
>                 Key: HADOOP-12335
>                 URL: https://issues.apache.org/jira/browse/HADOOP-12335
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: metrics
>            Reporter: Xianyin Xin
>            Assignee: Xianyin Xin
>         Attachments: ewma-preview-02.patch, ewma-preview.patch
>
>
> Sometimes we need to collect the average value of a variable, but for variables that
is time related, the more recent value is more important. For example, we want to see the
average container allocation rate in the last 5 min. Exponential weighted moving average is
a solution for this scenario.



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