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https://issues.apache.org/jira/browse/HADOOP-5262?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12673517#action_12673517
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Hemanth Yamijala commented on HADOOP-5262:
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+1. This would be a great addition. However, are you suggesting that we support
both modes ? So, if specified without a '%', this would become an absolute
number, and otherwise it would be a percentage ?
Expressing it purely as percentages has a very simple operational advantage
that it can be validated. For e.g. if the percentages add up to more than 100,
then we could warn the administrators or even stop the scheduler. Allowing both
modes would probably prevent us from such validations, no ?
> Allow specifying min shares as percentage of cluster
> ----------------------------------------------------
>
> Key: HADOOP-5262
> URL: https://issues.apache.org/jira/browse/HADOOP-5262
> Project: Hadoop Core
> Issue Type: New Feature
> Components: contrib/fair-share
> Reporter: Matei Zaharia
> Priority: Minor
>
> Currently the guaranteed shares for pools in the fair scheduler are specified
> as a number of slots. For organizations where a group pays X% of the cluster
> and the actual number of nodes in the cluster varies due to failures,
> expansion, etc over time, it would be useful to support a guaranteed share
> given as a percentage too. This would just let you write in the config file
> something like <minMaps>5%</minMaps> instead of <minMaps>42</minMaps>. The
> scheduler would need to recompute what this means in terms of number of slots
> on every update (probably through some kind of update(ClusterStatus) method
> in PoolManager).
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