Ashutosh Chauhan commented on HIVE-20801:

bq. Just that Hive is slowed down by a magnitude when ACID is enabled for even 
1 tables.
>From where this slowness coming from? Is that acquiring locks for  is slow?

> 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 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.

This message was sent by Atlassian JIRA

Reply via email to