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From "Sergey Shelukhin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-12050) change ORC split generation to use a different model
Date Mon, 25 Jul 2016 18:23:20 GMT

    [ https://issues.apache.org/jira/browse/HIVE-12050?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15392428#comment-15392428
] 

Sergey Shelukhin commented on HIVE-12050:
-----------------------------------------

.

> change ORC split generation to use a different model
> ----------------------------------------------------
>
>                 Key: HIVE-12050
>                 URL: https://issues.apache.org/jira/browse/HIVE-12050
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Sergey Shelukhin
>
> With directory listing, ETL vs BI decision, local cache, metastore cache, with PPD, file
footers, and combination thereof (e.g. most splits are processed via metastore PPD but some
files are not cached and we need to make ETL vs BI decision), some of which are blocking and
some not, -I want to write ORC split generation in Erlang- strategies are no longer the best
model to organize all the work. Some messaging or task queue based model might be better where
each worker that does a blocking operation (dir listing, file read, metastore call, etc.)
generates a list of things, and things are further processed by other workers until all things
are splits and there are no more other things to process.



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