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From "Sergey Shelukhin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-11969) start Tez session in background when starting CLI
Date Wed, 30 Sep 2015 22:13:04 GMT

    [ https://issues.apache.org/jira/browse/HIVE-11969?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14938961#comment-14938961
] 

Sergey Shelukhin commented on HIVE-11969:
-----------------------------------------

Container prewarm remains part of the init so it's not affected.
The CLI startup should be decoupled from Tez session startup because not all queries use Tez;
user can do number of operations like set/describe/create/explain/..., or even just typing
a query, before the session is even needed. There are also stats queries and local fetches
that don't require the session.
If the query hangs, it will be visible that the query has not started. IMHO it is actually
better because you can then check the state of the cluster to see what's going on.


> start Tez session in background when starting CLI
> -------------------------------------------------
>
>                 Key: HIVE-11969
>                 URL: https://issues.apache.org/jira/browse/HIVE-11969
>             Project: Hive
>          Issue Type: Bug
>          Components: Tez
>            Reporter: Sergey Shelukhin
>            Assignee: Sergey Shelukhin
>         Attachments: HIVE-11969.01.patch, HIVE-11969.patch
>
>
> Tez session spins up AM, which can cause delays, esp. if the cluster is very busy.
> This can be done in background, so the AM might get started while the user is running
local commands and doing other things.



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