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From "Arun Suresh (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-7926) long-lived daemons for query fragment execution, I/O and caching
Date Sat, 01 Oct 2016 01:36:20 GMT

    [ https://issues.apache.org/jira/browse/HIVE-7926?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15537624#comment-15537624
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Arun Suresh commented on HIVE-7926:
-----------------------------------

[~sseth], The LLAP [page|https://cwiki.apache.org/confluence/display/Hive/LLAP] refers to
YARN-1488 as the means by which LLAP does container delegation. Given that it is still an
open YARN jira, can you kindly point me to an LLAP jira / code / doc describing how this is
currently done?

> 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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