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https://issues.apache.org/jira/browse/HUDI-4792?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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nicolas paris reassigned HUDI-4792:
-----------------------------------
Assignee: nicolas paris
> Speed up cleaning with metadata table enabled
> ----------------------------------------------
>
> Key: HUDI-4792
> URL: https://issues.apache.org/jira/browse/HUDI-4792
> Project: Apache Hudi
> Issue Type: Improvement
> Reporter: nicolas paris
> Assignee: nicolas paris
> Priority: Major
> Labels: pull-request-available
>
> Currently fetching file group to be deleted is parallelized over each
> partition. As a result, in case of many partition, many calls are made on the
> metadata. While this is ok for file system view, this is highly inefficient
> with the metadata table view (MDT){*}.{*} Likely each call makes the MoR
> happens on the MDT and in the case of thousand of partitions the process is
> incredibly slow.
> I benchmarked (non incremental) cleaning on the same table w/ and w/o MDT on
> a 40k partitionned hudi table :
> * w/ MDT: 5 hours
> * w/o MDT: 5 minutes
> This slowness makes the use of MDT not reasonable in the case of many
> partitions, because cleaning is a must-have.
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