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From "Sergey Shelukhin (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-10940) HiveInputFormat::pushFilters serializes PPD objects for each getRecordReader call
Date Mon, 06 Jul 2015 20:04:05 GMT

     [ https://issues.apache.org/jira/browse/HIVE-10940?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sergey Shelukhin updated HIVE-10940:
------------------------------------
    Assignee:     (was: Sergey Shelukhin)

> HiveInputFormat::pushFilters serializes PPD objects for each getRecordReader call
> ---------------------------------------------------------------------------------
>
>                 Key: HIVE-10940
>                 URL: https://issues.apache.org/jira/browse/HIVE-10940
>             Project: Hive
>          Issue Type: Bug
>          Components: File Formats
>    Affects Versions: 1.2.0
>            Reporter: Gopal V
>             Fix For: 2.0.0
>
>         Attachments: HIVE-10940.01.patch, HIVE-10940.02.patch, HIVE-10940.03.patch, HIVE-10940.patch
>
>
> {code}
>     String filterText = filterExpr.getExprString();
>     String filterExprSerialized = Utilities.serializeExpression(filterExpr);
> {code}
> the serializeExpression initializes Kryo and produces a new packed object for every split.
> HiveInputFormat::getRecordReader -> pushProjectionAndFilters -> pushFilters.
> And Kryo is very slow to do this for a large filter clause.



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