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Date: Thu, 21 Jun 2007 15:14:26 -0700 (PDT)
From: "Doug Cutting (JIRA)" <jira@apache.org>
To: hadoop-dev@lucene.apache.org
Subject: [jira] Updated: (HADOOP-1518) Add session id to metric data
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     [ https://issues.apache.org/jira/browse/HADOOP-1518?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Doug Cutting updated HADOOP-1518:
---------------------------------

    Status: Open  (was: Patch Available)

The javadoc for set/getSessionId should describe what the session id is used for, as should the description in hadoop-default.xml.  Will this actually be set in site configurations, or only programatically?  If it's only set programatically, then it doesn't need to be in hadoop-default.xml, which primarily exists to document available parameters for site configuration, not necessarily every parameter ever used by programs. 

> Add session id to metric data
> -----------------------------
>
>                 Key: HADOOP-1518
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1518
>             Project: Hadoop
>          Issue Type: Improvement
>            Reporter: David Bowen
>            Assignee: David Bowen
>         Attachments: patch.txt
>
>
> In the context of Hadoop-On-Demand (HOD), we want to be able to aggregate metrics across the machines in the virtual cluster that corresponds to a HOD session. To enable this, we'd like to tag all the map/reduce related metrics with a session id.  The session id would be a string created by HOD (it might be a Torque job id) and put into the hadoop-site.xml file for the virtual cluster.
> The default value for the session id would be the empty string, so that non-HOD usage of the metrics is not affected accept for the addition of a tag which is always the empty string.

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