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Posted to dev@avro.apache.org by "alex gemini (JIRA)" <ji...@apache.org> on 2012/11/06 15:06:12 UTC

[jira] [Commented] (AVRO-1192) trevni should support RLE encoding based on selectivity

    [ https://issues.apache.org/jira/browse/AVRO-1192?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13491467#comment-13491467 ] 

alex gemini commented on AVRO-1192:
-----------------------------------

It should also investigate current trevni block size 64k is appropriate for compression.Most columnar format is 1mb block size.
                
> trevni should support RLE encoding based on selectivity
> -------------------------------------------------------
>
>                 Key: AVRO-1192
>                 URL: https://issues.apache.org/jira/browse/AVRO-1192
>             Project: Avro
>          Issue Type: Improvement
>    Affects Versions: 1.8.0
>            Reporter: alex gemini
>            Priority: Minor
>              Labels: compression, performance
>
> it would be nice if trevni support run-length encoding. columnar format should first sort the columnar order based on selectivity .for higher selectivity column trenvi should support run-length encoding .more information will be found in paper "C-Store: A Column-oriented DBMS" section 3.1 :Encoding Schemes 

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