[jira] [Commented] (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:comment-tabpanel&focusedCommentId=13500268#comment-13500268 ] 

Yin Huai commented on AVRO-1208:
--------------------------------

A simple way to moderate this issue is to provide a prefeching mechanism. Users and upper-layer applications can ask Trevni to prefetch certain number of blocks.

btw, if you think this improvement is valid, I can work on this jira.
                
> 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
>
> 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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