[jira] [Commented] (HIVE-14065) Provide an API for making Hive read-only for a short period

["Alexander Kolbasov (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-14065?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16464330#comment-16464330 ] 

Alexander Kolbasov commented on HIVE-14065:
-------------------------------------------

Apache Sentry no longer needs this API.

> Provide an API for making Hive read-only for a short period
> -----------------------------------------------------------
>
>                 Key: HIVE-14065
>                 URL: https://issues.apache.org/jira/browse/HIVE-14065
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Colin P. McCabe
>            Assignee: Colin P. McCabe
>            Priority: Major
>
> HIVE-7973 added a notification log which allows clients to do incremental replication of the Hive metastore.  However, it is a challenge to get the initial state of the Hive database.  Using existing APIs may give us an inconsistent state.  For example, if a Hive table is renamed while we're loading all tables, we may miss that information.
> The easiest way to fix this would be to provide an API for making Hive read-only for a short period.  This locking API would come with a timeout so that if the locker failed, the system would not stay down.  It would return an ID which uniquely identified the lock instance.  The read-only lock itself could be implemented by taking all the ZooKeeper locks.  The RPC for removing the lock would return back a status indicating whether the lock had timed out before being removed or not.  If it had timed out, we could retry our snapshot loading process with a longer timeout period.



--
This message was sent by Atlassian JIRA
(v7.6.3#76005)