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From "Robert Joseph Evans (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8608) Add Configuration API for parsing time durations
Date Thu, 19 Jul 2012 13:21:35 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8608?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13418278#comment-13418278
] 

Robert Joseph Evans commented on HADOOP-8608:
---------------------------------------------

That would be a great API to add in. +1 for this idea.  

In the yarn code we standardized to put the units in the name of the config property i.e.
yarn.am.liveness-monitor.expiry-interval-ms and yarn.resourcemanager.application-tokens.master-key-rolling-interval-secs.
 We probably want to be able to supply a default unit when getting a config so we can deprecate/replace
an old property and have both still be valid. 
                
> Add Configuration API for parsing time durations
> ------------------------------------------------
>
>                 Key: HADOOP-8608
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8608
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: conf
>    Affects Versions: 3.0.0
>            Reporter: Todd Lipcon
>
> Hadoop has a lot of configurations which specify durations or intervals of time. Unfortunately
these different configurations have little consistency in units - eg some are in milliseconds,
some in seconds, and some in minutes. This makes it difficult for users to configure, since
they have to always refer back to docs to remember the unit for each property.
> The proposed solution is to add an API like {{Configuration.getTimeDuration}} which allows
the user to specify the units with a prefix. For example, "10ms", "10s", "10m", "10h", or
even "10d". For backwards-compatibility, if the user does not specify a unit, the API can
specify the default unit, and warn the user that they should specify an explicit unit instead.

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