[jira] [Assigned] (HIVE-18047) Support dynamic service discovery for HiveMetaStore

["Bing Li (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-18047?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Bing Li reassigned HIVE-18047:
------------------------------


> Support dynamic service discovery for HiveMetaStore
> ---------------------------------------------------
>
>                 Key: HIVE-18047
>                 URL: https://issues.apache.org/jira/browse/HIVE-18047
>             Project: Hive
>          Issue Type: Bug
>          Components: Metastore
>            Reporter: Bing Li
>            Assignee: Bing Li
>
> Similar like what Hive does on HiveServer2 (HIVE-7935), a HiveMetaStore client can dynamically resolve an HiveMetaStore service to connect to via ZooKeeper.
> *High Level Design:*
> Whether dynamic service discovery is supported or not can be configured by setting
> HIVE_METASTORE_SUPPORT_DYNAMIC_SERVICE_DISCOVERY.  
> * This property should ONLY work when HiveMetaStrore service is in remote mode.
> * When an instance of HiveMetaStore comes up, it adds itself as a znode to Zookeeper under a configurable namespace (HIVE_METASTORE_ZOOKEEPER_NAMESPACE, e.g. hivemetastore).
> * A thrift client specifies the ZooKeeper ensemble in its connection string, instead of pointing to a specific HiveMetaStore instance. The ZooKeeper ensemble will pick an instance of HiveMetaStore to connect for the 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 HiveMetaStore uris from ZooKeeper.



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