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From "Wei Zheng (JIRA)" <>
Subject [jira] [Updated] (HIVE-15774) Ensure DbLockManager backward compatibility for non-ACID resources
Date Wed, 01 Feb 2017 19:19:51 GMT


Wei Zheng updated HIVE-15774:
    Attachment: HIVE-15774.1.patch

> Ensure DbLockManager backward compatibility for non-ACID resources
> ------------------------------------------------------------------
>                 Key: HIVE-15774
>                 URL:
>             Project: Hive
>          Issue Type: Improvement
>          Components: Hive, Transactions
>            Reporter: Wei Zheng
>            Assignee: Wei Zheng
>         Attachments: HIVE-15774.1.patch
> In pre-ACID days, users perform operations such as INSERT with either ZooKeeperHiveLockManager
or no lock manager at all. If their workflow is designed to take advantage of no locking and
they take care of the control of concurrency, this works well with good performance.
> With ACID, if users enable transactions (i.e. using DbTxnManager & DbLockManager),
then for all the operations, different types of locks will be acquired accordingly by DbLockManager,
even for non-ACID resources. This may impact the performance of some workflows designed for
pre-ACID use cases.
> A viable solution would be to differentiate the locking mode for ACID and non-ACID resources,
so that DbLockManager will continue its current behavior for ACID tables, but will be able
to acquire a less strict lock type for non-ACID resources, thus avoiding the performance loss
for those workflows.

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