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From "Eric Yang (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CHUKWA-570) Create a meta data table in HBase to keep track of columns
Date Sat, 31 Mar 2012 03:45:22 GMT

     [ https://issues.apache.org/jira/browse/CHUKWA-570?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Eric Yang updated CHUKWA-570:
-----------------------------

    Fix Version/s:     (was: 0.5.0)
    
> Create a meta data table in HBase to keep track of columns
> ----------------------------------------------------------
>
>                 Key: CHUKWA-570
>                 URL: https://issues.apache.org/jira/browse/CHUKWA-570
>             Project: Chukwa
>          Issue Type: New Feature
>          Components: MR Data Processors
>         Environment: Java 6, Mac OSX 10.6
>            Reporter: Eric Yang
>            Assignee: Eric Yang
>
> HBase provides dynamic columns, but it is costly to do table scan to figure out all the
columns at real time.  For HICC to display all columns stored in HBase to web user interface,
it would be better to cache the meta data in a small table.  This jira is to implement a mapreduce
job which scans for new columns for specified time ranges and deposit the column names into
a chukwa meta data table.

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