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https://issues.apache.org/jira/browse/IMPALA-7854?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17036429#comment-17036429
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Vihang Karajgaonkar commented on IMPALA-7854:
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I think we should look at this. I will put this on my plate for now, but I
don't think I will be able to take this up soon.
> Slow ALTER TABLE and LOAD DATA statements for tables with large number of
> partitions
> ------------------------------------------------------------------------------------
>
> Key: IMPALA-7854
> URL: https://issues.apache.org/jira/browse/IMPALA-7854
> Project: IMPALA
> Issue Type: Improvement
> Components: Catalog
> Affects Versions: Impala 2.12.0
> Environment: 14 Nodes
> Table in question has 20 columns, 3 partition columns, and 57,475 partitions
> Reporter: vietn
> Priority: Major
> Labels: impala, performance
>
> ALTER TABLE and LOAD DATA statements take minutes (9 minutes for ALTER TABLE
> and 6 minutes for LOAD DATA) for tables with a large number of partitions.
> Our workaround was to use Hive to perform the LOAD DATA and then perform a
> REFRESH PARTITION using Impala.
> * 14 Nodes
> * Table in question has 20 columns, 3 partition columns, and 57,475
> partitions
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