[jira] [Updated] (AVRO-1208) Improve Trevni's performance on row-oriented data access

["Yin Huai (JIRA)" <ji...@apache.org>]

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

Yin Huai updated AVRO-1208:
---------------------------
    Resolution: Won't Do
        Status: Resolved  (was: Patch Available)

> Improve Trevni's performance on row-oriented data access
> --------------------------------------------------------
>
>                 Key: AVRO-1208
>                 URL: https://issues.apache.org/jira/browse/AVRO-1208
>             Project: Apache Avro
>          Issue Type: Improvement
>          Components: java
>    Affects Versions: 1.7.3
>            Reporter: Yin Huai
>            Assignee: Yin Huai
>            Priority: Major
>         Attachments: AVRO-1208.1.patch, AVRO-1208.2.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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