phoenix-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "James Taylor (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PHOENIX-4724) Efficient Equi-Depth histogram for streaming data
Date Fri, 18 May 2018 05:33:00 GMT

    [ https://issues.apache.org/jira/browse/PHOENIX-4724?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16480191#comment-16480191
] 

James Taylor commented on PHOENIX-4724:
---------------------------------------

+1. Excellent work, [~vincentpoon] !

> Efficient Equi-Depth histogram for streaming data
> -------------------------------------------------
>
>                 Key: PHOENIX-4724
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-4724
>             Project: Phoenix
>          Issue Type: Sub-task
>    Affects Versions: 4.15.0
>            Reporter: Vincent Poon
>            Assignee: Vincent Poon
>            Priority: Major
>         Attachments: PHOENIX-4724.v1.patch, PHOENIX-4724.v2.patch
>
>
> Equi-Depth histogram from http://web.cs.ucla.edu/~zaniolo/papers/Histogram-EDBT2011-CamReady.pdf,
but without the sliding window - we assume a single window over the entire data set.
> Used to generate the bucket boundaries of a histogram where each bucket has the same
# of items.
> This is useful, for example, for pre-splitting an index table, by feeding in data from
the indexed column.
> Works on streaming data - the histogram is dynamically updated for each new value.



--
This message was sent by Atlassian JIRA
(v7.6.3#76005)

Mime
View raw message