hive-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Gunther Hagleitner (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-6262) Remove unnecessary copies of schema + table desc from serialized plan
Date Wed, 22 Jan 2014 07:53:19 GMT

     [ https://issues.apache.org/jira/browse/HIVE-6262?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Gunther Hagleitner updated HIVE-6262:
-------------------------------------

    Attachment: HIVE-6262.1.patch

> Remove unnecessary copies of schema + table desc from serialized plan
> ---------------------------------------------------------------------
>
>                 Key: HIVE-6262
>                 URL: https://issues.apache.org/jira/browse/HIVE-6262
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Gunther Hagleitner
>            Assignee: Gunther Hagleitner
>         Attachments: HIVE-6262.1.patch
>
>
> Currently for a partitioned table the following are true:
> - for each partitiondesc we send a copy of the corresponding tabledesc
> - for each partitiondesc we send two copies of the schema (in different formats).
> Obviously we need to send different schemas if they are required by schema evolution,
but in our case we'll always end up with multiple copies.
> The effect can be dramatic. The reductions by removing those on partitioned tables easily
be can be 8-10x in size. Plans themselves can be 10s to 100s of mb (even with kryo). The size
difference also plays out in every task on the cluster we run.



--
This message was sent by Atlassian JIRA
(v6.1.5#6160)

Mime
View raw message