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https://issues.apache.org/jira/browse/HIVE-10474?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Damien Carol updated HIVE-10474:
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Component/s: llap
> 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
> Components: llap
> Reporter: Sergey Shelukhin
> Attachments: llap-gc-pauses.png
>
>
> While most queries run faster in LLAP than just Tez with container reuse,
> TPCH Q1 is much slower.
> On my run, on 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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