[jira] [Updated] (PHOENIX-2724) Query with large number of guideposts is slower compared to no stats

["Samarth Jain (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PHOENIX-2724?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Samarth Jain updated PHOENIX-2724:
----------------------------------
    Attachment: PHOENIX-2724.patch

Likely patch. Running tests now to verify if I broke anything.

> Query with large number of guideposts is slower compared to no stats
> --------------------------------------------------------------------
>
>                 Key: PHOENIX-2724
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-2724
>             Project: Phoenix
>          Issue Type: Bug
>    Affects Versions: 4.7.0
>         Environment: Phoenix 4.7.0-RC4, HBase-0.98.17 on a 8 node cluster
>            Reporter: Mujtaba Chohan
>            Assignee: Samarth Jain
>             Fix For: 4.8.0
>
>         Attachments: PHOENIX-2724.patch
>
>
> With 1MB guidepost width for ~900GB/500M rows table. Queries with short scan range gets significantly slower.
> Without stats:
> {code}
> select * from T limit 10; // query execution time <100 msec
> {code}
> With stats:
> {code}
> select * from T limit 10; // query execution time >20 seconds
> Explain plan: CLIENT 876085-CHUNK 476569382 ROWS 876060986727 BYTES SERIAL 1-WAY FULL SCAN OVER T SERVER 10 ROW LIMIT CLIENT 10 ROW LIMIT
> {code}



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