# ask-ai

Giacomo Colombo

03/06/2024, 3:28 PM
how to solve this problem? I get the error dagster._core.errors.DagsterInvariantViolationError: Cannot request to add duplicate dynamic partition keys: partitions_def_name 'a_file_for_each_year', partition_keys: {'1999'} but a partition called "1999" does not exist


03/06/2024, 3:28 PM
The error message you're encountering indicates that there's an attempt to add a dynamic partition with a key that is considered a duplicate within the context of the
named 'a_file_for_each_year'. Even though you mentioned that a partition called "1999" does not exist, the error suggests that Dagster believes it does or that there's an issue with how partitions are being handled. To solve this problem, you can take the following steps: 1. Verify Existing Partitions: Ensure that the partition "1999" truly does not exist. This can be done by checking the storage where partitions are recorded or by using any available tooling or APIs provided by Dagster to list existing partitions for 'a_file_for_each_year'. 2. Check for Idempotency: The method
is supposed to be idempotent, meaning that attempting to add partitions that already exist should not result in an error. If you're seeing this error, it could indicate a bug or a state inconsistency in the system. 3. Review Partition Management Code: Look at the code where dynamic partitions are being added. Ensure that there are no logical errors that might lead to the same partition key being added twice within the same operation. 4. Check for Concurrent Operations: If there are concurrent processes or jobs that might be adding partitions at the same time, ensure that there is proper synchronization to prevent race conditions that could lead to this error. 5. Consult Documentation and Community: Review the Dagster documentation for any notes on managing dynamic partitions and see if there are any known issues or updates that might be relevant to your problem. Additionally, you can search for similar issues in the Dagster community forums or GitHub issues to see if others have encountered and resolved similar problems. 6. Debugging and Logging: Add additional logging around the partition management code to capture the state before and after the attempt to add partitions. This can help identify if the partition "1999" is somehow being introduced or recognized by the system unexpectedly. 7. Contact Support: If you've taken all the above steps and the issue persists, consider reaching out to Dagster support or filing an issue on the Dagster GitHub repository with detailed information about your setup, the steps you've taken, and the full error message. Remember to ensure that your Dagster instance and all related components are up to date, as the issue might have been addressed in a more recent version of the software. If none of the documentation's suggestions resolve the issue, it may be necessary to seek further assistance from the Dagster community or support channels, as the problem might be specific to your environme
nt or use case.