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Date: Mon, 27 Dec 2010 16:44:45 -0500 (EST)
From: "Eric Yang (JIRA)" <jira@apache.org>
To: chukwa-dev@incubator.apache.org
Subject: [jira] Created: (CHUKWA-569) Add an option to speed up
 graph_explorer.jsp in fetching Column Name and Row Name
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Add an option to speed up graph_explorer.jsp in fetching Column Name and Row Name
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                 Key: CHUKWA-569
                 URL: https://issues.apache.org/jira/browse/CHUKWA-569
             Project: Chukwa
          Issue Type: Improvement
          Components: User Interface
         Environment: Java 6, MacOSX 10.6
            Reporter: Eric Yang
            Assignee: Eric Yang
             Fix For: 0.5.0


When select a column family, the only way to figure out all columns inside the column family is to do a scan.  Since HBase does not have an API to get column names only, we have to provide a temporary workaround.  We can add an option to do full table scan, and we scan small amount of data to figure out the column patterns by default.  This short cut make assumption that data are in repeated pattern, scanning one row should be sufficient to find all the columns.  The same principle applies in scanning for unique row names.

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