[jira] [Issue Comment Deleted] (HIVE-22755) Cleaner/Compaction can skip the read locks and use the min open txn id

["Peter Vary (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-22755?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Peter Vary updated HIVE-22755:
------------------------------
    Comment: was deleted

(was: I have 2 ideas:
* Time based approach: use the start time of the minOpenTxn to filter the files to clean
* Instead of skipping every read lock, create a read lock per table instead of per partition. This would fix some failures created by the previous patch with the added benefit of knowing what tables are under read.

CC: [~lpinter], [~dkuzmenko])

> Cleaner/Compaction can skip the read locks and use the min open txn id
> ----------------------------------------------------------------------
>
>                 Key: HIVE-22755
>                 URL: https://issues.apache.org/jira/browse/HIVE-22755
>             Project: Hive
>          Issue Type: Sub-task
>          Components: Transactions
>            Reporter: Slim Bouguerra
>            Priority: Major
>             Fix For: 4.0.0
>
>
> The minOpenTxnId is used by the Cleaner here
> https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/txn/compactor/Cleaner.java#L154
> This currently converts it to open write-ids to clean appropriately.



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