[
https://issues.apache.org/jira/browse/DATAFU-91?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14569014#comment-14569014
]
Ido Hadanny commented on DATAFU-91:
-----------------------------------
Matt, please regard only the latest patch - hyper-log-log-algebraic-3.diff.
We have tested it on a 250 nodes cluster, with 3 gigs of data typical for our
use pattern.
The improvement in execution times was from 4 minutes to 2 minutes!
See all statistics + comparison to good old count distinct here:
https://docs.google.com/spreadsheets/d/1oVYSCh22kufgQ49pgsuboKOMxDgz8N5yBtRpxuo69Lk/edit?usp=sharing
> pig version of HyperLogLog estimator should be Algebraic and use combiners
> --------------------------------------------------------------------------
>
> Key: DATAFU-91
> URL: https://issues.apache.org/jira/browse/DATAFU-91
> Project: DataFu
> Issue Type: Bug
> Affects Versions: 1.3.0
> Reporter: Ido Hadanny
> Assignee: Ido Hadanny
> Priority: Minor
> Fix For: 1.3.0
>
> Attachments: hyper-log-log-algebraic-3.diff,
> hyper-log-log-algebraic.diff, hyper-log-log-algebraic.diff
>
>
> Matt: I don't remember if there was a particular reason I didn't implement
> this as AlgebraicEvalFunc. It seems like it could be. I believe the Java
> MapReduce version leverages the combiner. If you want to try making this
> Algebraic we would be happy to accept a patch :)
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
