[jira] [Commented] (HIVE-7926) long-lived daemons for query fragment execution, I/O and caching

["Shannon Ladymon (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-7926?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15504935#comment-15504935 ] 

Shannon Ladymon commented on HIVE-7926:
---------------------------------------

[~sershe], can you clarify why the # is used in #LLAP in the [design doc | https://issues.apache.org/jira/secure/attachment/12665704/LLAPdesigndocument.pdf]? 

> long-lived daemons for query fragment execution, I/O and caching
> ----------------------------------------------------------------
>
>                 Key: HIVE-7926
>                 URL: https://issues.apache.org/jira/browse/HIVE-7926
>             Project: Hive
>          Issue Type: New Feature
>            Reporter: Sergey Shelukhin
>            Assignee: Sergey Shelukhin
>              Labels: TODOC2.0
>             Fix For: 2.0.0
>
>         Attachments: LLAPdesigndocument.pdf
>
>
> We are proposing a new execution model for Hive that is a combination of existing process-based tasks and long-lived daemons running on worker nodes. These nodes can take care of efficient I/O, caching and query fragment execution, while heavy lifting like most joins, ordering, etc. can be handled by tasks.
> The proposed model is not a 2-system solution for small and large queries; neither it is a separate execution engine like MR or Tez. It can be used by any Hive execution engine, if support is added; in future even external products (e.g. Pig) can use it.
> The document with high-level design we are proposing will be attached shortly.



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