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Posted to dev@hive.apache.org by "Vaibhav Gumashta (JIRA)" <ji...@apache.org> on 2014/10/07 06:18:34 UTC
[jira] [Updated] (HIVE-7935) Support dynamic service discovery for
HiveServer2
[ https://issues.apache.org/jira/browse/HIVE-7935?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Vaibhav Gumashta updated HIVE-7935:
-----------------------------------
Issue Type: Sub-task (was: New Feature)
Parent: HIVE-8376
> Support dynamic service discovery for HiveServer2
> -------------------------------------------------
>
> Key: HIVE-7935
> URL: https://issues.apache.org/jira/browse/HIVE-7935
> Project: Hive
> Issue Type: Sub-task
> Components: HiveServer2, JDBC
> Affects Versions: 0.14.0
> Reporter: Vaibhav Gumashta
> Assignee: Vaibhav Gumashta
> Labels: TODOC14
> Fix For: 0.14.0
>
> Attachments: HIVE-7935.1.patch, HIVE-7935.2.patch, HIVE-7935.3.patch, HIVE-7935.4.patch, HIVE-7935.5.patch, HIVE-7935.6.patch, HIVE-7935.7.patch, HIVE-7935.8.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 HIVE_SERVER2_SUPPORT_DYNAMIC_SERVICE_DISCOVERY. ZooKeeper is used to support this.
> * 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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