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Posted to issues@hive.apache.org by "Gopal Vijayaraghavan (Jira)" <ji...@apache.org> on 2020/01/21 17:41:00 UTC

[jira] [Assigned] (HIVE-20801) ACID: Allow DbTxnManager to ignore non-ACID table locking

     [ https://issues.apache.org/jira/browse/HIVE-20801?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Gopal Vijayaraghavan reassigned HIVE-20801:
-------------------------------------------

    Assignee: Gopal Vijayaraghavan  (was: Gopal V)

> ACID: Allow DbTxnManager to ignore non-ACID table locking
> ---------------------------------------------------------
>
>                 Key: HIVE-20801
>                 URL: https://issues.apache.org/jira/browse/HIVE-20801
>             Project: Hive
>          Issue Type: Bug
>          Components: Locking, Transactions
>    Affects Versions: 4.0.0
>            Reporter: Gopal Vijayaraghavan
>            Assignee: Gopal Vijayaraghavan
>            Priority: Major
>              Labels: Branch3Candidate, TODOC
>         Attachments: HIVE-20801.1.patch, HIVE-20801.2.patch, HIVE-20801.2.patch, HIVE-20801.3.patch, HIVE-20801.3.patch
>
>
> Enabling ACIDv1 on a cluster produces a central locking bottleneck for all table types, which is not always the intention.
> The Hive locking for non-acid tables are advisory (i.e a client can write/read without locking), which means that the implementation does not offer strong consistency despite the lock manager consuming resources centrally.
> Disabling this lock acquisition would improve the performance of non-ACID tables co-existing with a globally configured DbTxnManager implementation.



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