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https://issues.apache.org/jira/browse/HDFS-7483?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14627322#comment-14627322
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Haohui Mai commented on HDFS-7483:
----------------------------------
{code}
+ var helpers = {
+ 'percentage': function(chunk, context, bodies, params) {
+ var a = dust.helpers.tap(params.a, chunk, context);
+ var b = dust.helpers.tap(params.b, chunk, context);
+ var f = parseFloat(a)/parseFloat(b);
+ return chunk.write(Math.round(f * 10000) / 100 + '%');
+ }
+ };
+
+ for(var key in helpers) {
+ dust.helpers[key] = helpers[key];
+ }
+
{code}
A better approach is to do it through the math helper
(http://www.dustjs.com/guides/dust-helpers/) and to format it with the
{{fmt_percentage}} helper.
> Display information per tier on the Namenode UI
> -----------------------------------------------
>
> Key: HDFS-7483
> URL: https://issues.apache.org/jira/browse/HDFS-7483
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Benoy Antony
> Assignee: Benoy Antony
> Attachments: HDFS-7483-001.patch, HDFS-7483-002.patch, overview.png,
> storagetypes.png, storagetypes_withnostorage.png, withOneStorageType.png,
> withTwoStorageType.png
>
>
> If cluster has different types of storage, it is useful to display the
> storage information per type.
> The information will be available via JMX (HDFS-7390)
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