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https://issues.apache.org/jira/browse/HDFS-853?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12796772#action_12796772
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Andrew Ryan commented on HDFS-853:
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We're currently graphing both mean and standard deviation of datanodes from
that mean, using a script that parses the output of 'dfsadmin -report'. Our DFS
cluster nodes all have the same amount of disk space, so you'd expect mean of
individual datanodes to be the same as % DFS full, but it's not quite the same.
Haven't yet looked into why this is so.
To directly answer Konstantin's question, the one line we're using is standard
deviation.
> The HDFS webUI should show a metric that summarizes whether the cluster is
> balanced regarding disk space usage
> --------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-853
> URL: https://issues.apache.org/jira/browse/HDFS-853
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: name-node
> Reporter: dhruba borthakur
>
> It is desirable to know how much the datanodes vary form one another in terms
> of space utilization to get a sense of how well a HDFS cluster is balanced.
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