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From "Haohui Mai (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7483) Display information per tier on the Namenode UI
Date Wed, 15 Jul 2015 00:13:05 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7483?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14627322#comment-14627322
] 

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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