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Posted to issues@hawq.apache.org by "Hubert Zhang (JIRA)" <ji...@apache.org> on 2016/01/27 09:27:39 UTC

[jira] [Assigned] (HAWQ-366) Analyse data locality ratio for TPCH query in SFO

     [ https://issues.apache.org/jira/browse/HAWQ-366?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Hubert Zhang reassigned HAWQ-366:
---------------------------------

    Assignee: Hubert Zhang  (was: Lei Chang)

> Analyse data locality ratio for TPCH query in SFO
> -------------------------------------------------
>
>                 Key: HAWQ-366
>                 URL: https://issues.apache.org/jira/browse/HAWQ-366
>             Project: Apache HAWQ
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Hubert Zhang
>            Assignee: Hubert Zhang
>
> Data locality ratio for TPCH query(such as Q2) in SFO is low when some machines are down.
> The reason for this is that we change net_disk_ratio to 1.0 which leads to we prefer the virtual segment with minimum allocated size plus current split size, but not LOCAL!
> To prevent this happens we need to enlarge net_disk_ratio to 1.01. Then if the current size of two vsegs  are almost the same, we can choose the LOCAL one.



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