Trino INVALID_QUERY_ID error encountered when executing a query.

What is Trino INVALID_QUERY_ID error encountered when executing a query.

Understanding Trino: A Powerful SQL Query Engine

Trino, formerly known as PrestoSQL, is a distributed SQL query engine designed to query large datasets across various data sources. It is widely used for its ability to perform fast analytics on data stored in Hadoop, relational databases, and other data storage systems. Trino is particularly popular in big data environments due to its scalability and support for a wide range of data formats and sources.

Identifying the Symptom: INVALID_QUERY_ID Error

When working with Trino, you might encounter the INVALID_QUERY_ID error. This error typically appears when you attempt to reference a query using an ID that Trino does not recognize. The error message usually states that the specified query ID is invalid or does not exist, which can halt your query execution process.

Exploring the Issue: What Causes INVALID_QUERY_ID?

The INVALID_QUERY_ID error occurs when the query ID you are using is incorrect or has been mistyped. This can happen if the query ID is manually entered incorrectly or if there is a misunderstanding about the query's lifecycle. Query IDs in Trino are unique identifiers assigned to each query execution, and they are essential for tracking and managing queries.

Common Scenarios Leading to INVALID_QUERY_ID

Attempting to reference a query ID that has already completed and is no longer available. Using a query ID that was never generated due to a previous error or misconfiguration. Typographical errors when entering the query ID manually.

Steps to Resolve the INVALID_QUERY_ID Error

To resolve the INVALID_QUERY_ID error, follow these steps:

1. Verify the Query ID

Ensure that the query ID you are using is correct. Double-check for any typographical errors or misentries. If you are copying the query ID from a log or output, ensure that it is complete and accurate.

2. Check Query Lifecycle

Understand the lifecycle of your queries. If a query has completed or failed, its ID might no longer be valid. You can check the status of queries using the Trino web UI or by querying the system.runtime.queries table:

SELECT query_id, state, query FROM system.runtime.queries WHERE query_id = 'your_query_id';

This will help you determine if the query ID is still active or if it has already completed.

3. Use the Correct Query ID

If you are using a script or application to manage queries, ensure that it is correctly capturing and using the query IDs. Consider implementing logging to capture query IDs as they are generated for easier reference.

Additional Resources

For further assistance, consider visiting the following resources:

Trino Documentation - Official documentation for Trino, including query management and error handling. Trino Blog - Insights and updates from the Trino community. Trino GitHub Issues - Community discussions and issue tracking for Trino.