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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (AVRO-1208) Improve Trevni's performance on row-oriented data access
Date Fri, 01 Feb 2013 23:10:12 GMT

     [ https://issues.apache.org/jira/browse/AVRO-1208?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Doug Cutting updated AVRO-1208:
-------------------------------

    Assignee: Yin Huai
    
> Improve Trevni's performance on row-oriented data access
> --------------------------------------------------------
>
>                 Key: AVRO-1208
>                 URL: https://issues.apache.org/jira/browse/AVRO-1208
>             Project: Avro
>          Issue Type: Improvement
>    Affects Versions: 1.7.3
>            Reporter: Yin Huai
>            Assignee: Yin Huai
>         Attachments: AVRO-1208.1.patch
>
>
> Trevni uses an 64KB internal buffer to store values of a column. When accessing a column,
it reads 64KB (if we do not consider compression and checksum) data from the storage layer.
However, when the table is accessed in a row-oriented fashion (a entire row needs to be handed
over to the upper layer), in the worst case (a full table scan and values of this table are
all the same size), every 64KB data read can cause a seek.
> This jira is used to discuss if we should consider the data access pattern mentioned
above and if so, how to improve the performance of Trevni. Row-oriented data processing engines,
e.g. Hive, can benefit from this work.

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