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https://issues.apache.org/jira/browse/HIVE-7926?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14124708#comment-14124708
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Brock Noland commented on HIVE-7926:
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bq. Small/short queries can be largely processed by this daemon directly, while
any heavy lifting will be performed in standard YARN containers.
Can you speak to how this would work? For example, how would a request flow
through the system in both cases with LLAP running? How would the decision be
made to send a request "directly" to LLAP?
> 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
> 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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