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From "Eric Yang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CHUKWA-569) Add an option to speed up graph_explorer.jsp in fetching Column Name and Row Name
Date Wed, 29 Dec 2010 03:11:46 GMT

    [ https://issues.apache.org/jira/browse/CHUKWA-569?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12975703#action_12975703
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Eric Yang commented on CHUKWA-569:
----------------------------------

A separate metadata table to keep track of the columns is a better implementation than this
jira implies.  There are two missing pieces for the recommendation to work.  We need a workflow
scheduler to run periodically, and the mapreduce job to scan for extra columns with specified
table name and time range.  

For the first one, workflow scheduler system, we can use Oozie workflow scheduler.  For mapreduce
which scan for columns, and update the meta data table, I filed CHUKWA-570.

> Add an option to speed up graph_explorer.jsp in fetching Column Name and Row Name
> ---------------------------------------------------------------------------------
>
>                 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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