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From "Zhihong Yu (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-5142) Compute quantile/ntile using AggregateProtocol
Date Mon, 09 Jan 2012 00:35:39 GMT

     [ https://issues.apache.org/jira/browse/HBASE-5142?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Zhihong Yu updated HBASE-5142:
------------------------------

    Description:     (was: Looking at http://en.wikipedia.org/wiki/Standard_deviation, I think
two passes are involved in computing std:
1. compute average, u
2. tuple of (sum of (xi-u)*(xi-u), number of rows) is returned from each region
3. client computes std based on results from step 2)
        Summary: Compute quantile/ntile using AggregateProtocol  (was: Compute standard deviation
using AggregateProtocol)
    
> Compute quantile/ntile using AggregateProtocol
> ----------------------------------------------
>
>                 Key: HBASE-5142
>                 URL: https://issues.apache.org/jira/browse/HBASE-5142
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Zhihong Yu
>


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