The hive schema holds the hive tables though. You might find the original Hive paper useful. Note: If you are using Cloudera Manager to manage your clusters, the Metastore schematool is also available in the Hive service page to validate or upgrade the metastore:. 2. Instead of using the Databricks Hive metastore, you have the option to use an existing external Hive metastore instance or the AWS Glue Catalog. The following example creates an external schema using a Hive metastore database named hive_db. If the external metastore version is Hive 2.0 or above, use the Hive Schema Tool to create the metastore tables. Hive-Metastore. What is Hive Metastore? The hive metastore DB is a normal MySQL/etc database with a hive schema in it. By default, Hive uses a built-in Derby SQL server. So, the information schema is irrelevant to hive; to get the hive table details, you have to interrogate the TBLS table, for example. Solution. This tool can be used to initialize the metastore schema for the current Hive version. The Hive properties to implicitly create or alter the existing schema are disabled by default. The Hive Metastore destination compares information in metadata records with Hive tables, and then creates or updates the tables as needed. This article will go through the steps to upgrade metastore schema using Hive schema tool, taking PostgreSQL for example. Verify if the metastore schema version is compatible with Hive binaries. 3. hive.metastore.schema.verification is not enabled so recording the schema version 1.1.0-cdh5.12.0 17/09/10 23:13:42 WARN metastore.ObjectStore: Failed to get database default, returning NoSuchObjectException The reason for this issue is that the Hive Metastore cannot access the Hive database. It is implemented using tables in a relational database. Hive now records the schema version in the metastore database and verifies that the metastore schema version is compatible with the Hive binaries that are going to access the metastore. I would also suggest you to browse through the official Hive documentation and read the good book Programming Hive. It stores metadata for Hive tables (like their schema and location) and partitions in a relational database. Every Databricks deployment has a central Hive metastore accessible by all clusters to persist table metadata. It provides client access to this information by using metastore service API. Before Hive 0.12, we have to manually run the upgrade DDL SQL files in the metastore database. All Hive implementations need a metastore service, where it stores metadata. Upgrade the schema from an older version to current. Schematool is a offline command line tool to manage the metastore.. Use the Metastore command-line schematool to upgrade or validate the metastore database schema for unmanaged clusters.. Metastores. From the Cloudera Manager Admin console, select the Hive service. For versions below Hive 2.0, add the metastore tables with the following configurations in your existing init script: This is the link to metastore ER diagram. In the CREATE EXTERNAL SCHEMA statement, specify FROM HIVE METASTORE and include the metastore's URI and port number. 17/09/10 23:13:41 WARN metastore.ObjectStore: Version information not found in metastore. 2. Metastore is the central repository of Apache Hive metadata.
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