Apache Hive HIVE_METASTORE_ERROR

The Hive metastore is not reachable or is down.

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What is

Apache Hive HIVE_METASTORE_ERROR

?

Understanding Apache Hive

Apache Hive is a data warehouse software project built on top of Apache Hadoop for providing data query and analysis. Hive gives an SQL-like interface to query data stored in various databases and file systems that integrate with Hadoop. It is designed for managing and querying structured data.

Recognizing the Symptom: HIVE_METASTORE_ERROR

When working with Apache Hive, you might encounter the error HIVE_METASTORE_ERROR. This error typically manifests when the Hive metastore, which is crucial for storing metadata about the data, is not accessible. Users may notice that queries fail to execute, or they receive error messages indicating that the metastore is unreachable.

Exploring the Issue: What Causes HIVE_METASTORE_ERROR?

The HIVE_METASTORE_ERROR is generally caused by the Hive metastore service being down or unreachable. The metastore is a critical component that stores metadata about tables, partitions, and other data structures. If the service is not running or there are network connectivity issues, Hive cannot access the necessary metadata, leading to this error.

Common Causes

The Hive metastore service is not running.
Network connectivity issues between Hive and the metastore.
Misconfiguration in Hive or metastore settings.

Steps to Resolve HIVE_METASTORE_ERROR

To resolve the HIVE_METASTORE_ERROR, follow these steps:

1. Check Metastore Service Status

Ensure that the Hive metastore service is running. You can check the status of the service using the following command:

service hive-metastore status

If the service is not running, start it using:

service hive-metastore start

2. Verify Network Connectivity

Ensure that there is proper network connectivity between the Hive server and the metastore. You can use tools like ping or netcat to test connectivity:

ping metastore-hostnamenc -zv metastore-hostname 9083

3. Check Configuration Settings

Review the Hive configuration files to ensure that the metastore connection settings are correct. Check the hive-site.xml file for properties like hive.metastore.uris and ensure they point to the correct metastore URI.

4. Review Logs for Errors

Examine the Hive and metastore logs for any error messages that might provide additional clues. Logs are typically located in the /var/log/hive directory.

Additional Resources

For more information on configuring and troubleshooting Hive, refer to the Apache Hive Wiki and the official Apache Hive documentation.

Attached error:

Apache Hive HIVE_METASTORE_ERROR

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