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https://issues.apache.org/jira/browse/HIVE-25781?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Denys Kuzmenko resolved HIVE-25781.
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Resolution: Fixed
> Restore multi-threaded support in Cleaner after HIVE-25115
> ----------------------------------------------------------
>
> Key: HIVE-25781
> URL: https://issues.apache.org/jira/browse/HIVE-25781
> Project: Hive
> Issue Type: Bug
> Reporter: Denys Kuzmenko
> Priority: Major
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> In the case of accumulated entries for the same table/partition, they should
> be processed one by one in ASC order of write_id's.
> However, to support multi-threaded processing in the Cleaner, we need to make
> sure that the entries from the same group are not processed concurrently by
> multiple threads.
> One of the solutions that don't involve synchronization (check if already in
> flight, re-try when possible) would be to move the entries from the same
> group to the next Cleaner cycle.
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