[jira] [Commented] (HIVE-10474) LLAP: investigate why TPCH Q1 1k is slow

["Sergey Shelukhin (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-10474?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14510047#comment-14510047 ] 

Sergey Shelukhin commented on HIVE-10474:
-----------------------------------------

[~hagleitn] [~sseth] [~gopalv] fyi

> LLAP: investigate why TPCH Q1 1k is slow
> ----------------------------------------
>
>                 Key: HIVE-10474
>                 URL: https://issues.apache.org/jira/browse/HIVE-10474
>             Project: Hive
>          Issue Type: Sub-task
>            Reporter: Sergey Shelukhin
>
> While most queries run faster in LLAP than just Tez with container reuse, TPCH Q1 is much slower.
> On my run, tez with container reuse (current default LLAP configuration but mode == container and no daemons running)  runs 2-6 (out of 6 consecutive runs in the same session) finished in 25.5sec average; with 16 LLAP daemons in default config the average was 35.5sec; same w/o IO elevator (to rule out its impact) it took 59.7sec w/strange distribution (later runs were slower than earlier runs, still, fastest run was 49.5sec).
> So excluding IO elevator it's more than 2x degradation.
> We need to figure out why this is happening. Is it just slot discrepancy? Regardless, this needs to be addressed.



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