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From "Ravindra Pesala (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (CARBONDATA-1213) Removed rowCountPercentage check and fixed IUD data load issue
Date Fri, 23 Jun 2017 07:46:01 GMT

     [ https://issues.apache.org/jira/browse/CARBONDATA-1213?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ravindra Pesala resolved CARBONDATA-1213.
-----------------------------------------
    Resolution: Fixed

> Removed rowCountPercentage check and fixed IUD data load issue
> --------------------------------------------------------------
>
>                 Key: CARBONDATA-1213
>                 URL: https://issues.apache.org/jira/browse/CARBONDATA-1213
>             Project: CarbonData
>          Issue Type: Bug
>            Reporter: Manish Gupta
>            Assignee: Manish Gupta
>             Fix For: 1.2.0
>
>          Time Spent: 2h 40m
>  Remaining Estimate: 0h
>
> Problems:
> 1. Row count percentage not required with high cardinality threshold check
> 2. IUD returning incorrect results in case of update on high cardinality column
> Analysis:
> 1. In case a column is identified as high cardinality column still it is not getting
converted to no dictionary column because of another parameter check called rowCountPercentage.
Default value of rowCountPercentage is 80%. Due to this even though high cardinality column
is identified, if it is less than 80% of the total number of rows it will be treated as dictionary
column. This can still lead to executor lost failure due to memory constraints.
> 2. RLE on a column is not being set correctly and due to incorrect code design RLE applicable
on a column is decided by a different part of code from the one which is actually applying
the RLE on a column. Because of this Footer is getting filled with incorrect RLE information
and query is failing.



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