hive-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Dhiraj Kumar (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-15486) DefaultGraphWalker invokes getChildren() as many times as there are children
Date Wed, 21 Dec 2016 14:18:58 GMT

     [ https://issues.apache.org/jira/browse/HIVE-15486?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Dhiraj Kumar updated HIVE-15486:
--------------------------------
    Attachment: query

> DefaultGraphWalker invokes getChildren() as many times as there are children
> ----------------------------------------------------------------------------
>
>                 Key: HIVE-15486
>                 URL: https://issues.apache.org/jira/browse/HIVE-15486
>             Project: Hive
>          Issue Type: Bug
>          Components: Query Processor
>    Affects Versions: 2.0.0, 2.1.0
>            Reporter: Dhiraj Kumar
>         Attachments: query
>
>
> DefaultGraphWalker while walking a Node, calls up getChildren method as many times as
there are children. This leads a performance penalty where a node has too many direct children.

> Attached is query file. Instructions to run
> 1. time hive -f query  
> Checkout the time on 1.2 version vs 2.1 version. 
> This change was introduced in [HIVE-11652|https://issues.apache.org/jira/browse/HIVE-11652]



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

Mime
View raw message