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https://issues.apache.org/jira/browse/HIVE-25651?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ádám Szita resolved HIVE-25651.
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Fix Version/s: 4.0.0
Resolution: Fixed
Committed to master. Thanks for the review [~mbod] and [~pvary] !
> Enable LLAP cache affinity for Iceberg ORC splits
> -------------------------------------------------
>
> Key: HIVE-25651
> URL: https://issues.apache.org/jira/browse/HIVE-25651
> Project: Hive
> Issue Type: Improvement
> Reporter: Ádám Szita
> Assignee: Ádám Szita
> Priority: Major
> Fix For: 4.0.0
>
>
> Since HiveIcebergInputformat doesn't implement any LLAP marker interfaces,
> cache affinity is never tried, and so any split containing ORC file parts may
> go to a random LLAP daemon, causing subpar hit ratio later.
> So we should:
> * let HS2 know that cache affinity is required for this inputformat
> * prevent Iceberg from grouping separate files together in one combined
> split in case of LLAP execution
> * provide proper getPath() result for HiveIcebergSplit, so that
> HostAffinitySplitLocationProvider calculates different hashes for different
> files (right now getPath() returns table location only)
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