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From "Vaibhav Gumashta (JIRA)" <>
Subject [jira] [Commented] (HIVE-7935) Support dynamic service discovery for HiveServer2
Date Sun, 07 Sep 2014 13:31:28 GMT


Vaibhav Gumashta commented on HIVE-7935:

[~thejas] [~alangates] Latest patch addresses review comments. Thanks!

> Support dynamic service discovery for HiveServer2
> -------------------------------------------------
>                 Key: HIVE-7935
>                 URL:
>             Project: Hive
>          Issue Type: New Feature
>          Components: HiveServer2, JDBC
>    Affects Versions: 0.14.0
>            Reporter: Vaibhav Gumashta
>            Assignee: Vaibhav Gumashta
>             Fix For: 0.14.0
>         Attachments: HIVE-7935.1.patch, HIVE-7935.2.patch
> To support Rolling Upgrade / HA, we need a mechanism by which a JDBC client can dynamically
resolve an HiveServer2 to connect to.
> *High Level Design:* 
> Whether, dynamic service discovery is supported or not, can be configured by setting
> * When an instance of HiveServer2 comes up, it adds itself as a znode to ZooKeeper under
a configurable namespace (HIVE_SERVER2_ZOOKEEPER_NAMESPACE).
> * A JDBC/ODBC client now specifies the ZooKeeper ensemble in its connection string, instead
of pointing to a specific HiveServer2 instance. The JDBC driver, uses the ZooKeeper ensemble
to pick an instance of HiveServer2 to connect for the entire session.
> * When an instance is removed from ZooKeeper, the existing client sessions continue till
completion. When the last client session completes, the instance shuts down.
> * All new client connection pick one of the available HiveServer2 uris from ZooKeeper.

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