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From "Gopal V (JIRA)" <>
Subject [jira] [Updated] (HIVE-20801) ACID: Allow DbTxnManager to ignore non-ACID table locking
Date Fri, 11 Jan 2019 06:01:00 GMT


Gopal V updated HIVE-20801:
    Attachment: HIVE-20801.3.patch

> ACID: Allow DbTxnManager to ignore non-ACID table locking
> ---------------------------------------------------------
>                 Key: HIVE-20801
>                 URL:
>             Project: Hive
>          Issue Type: Bug
>          Components: Locking, Transactions
>    Affects Versions: 4.0.0
>            Reporter: Gopal V
>            Assignee: Gopal V
>            Priority: Major
>              Labels: Branch3Candidate, TODOC
>         Attachments: HIVE-20801.1.patch, HIVE-20801.2.patch, HIVE-20801.2.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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