Thanos is an open-source project that provides highly available Prometheus setup with long-term storage capabilities. It is designed to aggregate data from multiple Prometheus instances, enabling scalable and reliable metrics storage and querying. Thanos extends Prometheus by adding global query view, unlimited storage, and downsampling capabilities.
One common issue users encounter with Thanos is the error message: compaction: failed to plan compaction. This error indicates that Thanos is unable to proceed with the compaction process, which is crucial for optimizing storage and improving query performance.
When this issue occurs, you may notice increased storage usage and slower query performance. The logs will typically contain the error message, making it clear that compaction planning has failed.
The compaction process in Thanos involves merging smaller blocks into larger ones to optimize storage. Failure in planning compaction can arise from several factors:
To diagnose the issue, it is crucial to examine the logs for any specific errors related to block corruption or resource constraints. This will help in pinpointing the exact cause of the failure.
Resolving the compaction failure involves a series of steps to ensure block integrity and resource availability:
Start by examining the Thanos logs for any errors related to block corruption or resource issues. Use the following command to view the logs:
kubectl logs --namespace=
Look for any specific error messages that can guide you to the root cause.
Use the Thanos tool to verify the integrity of the blocks. Run the following command to check for corrupted blocks:
thanos tools bucket verify --objstore.config-file=
This command will help identify any corrupted blocks that need to be addressed.
Check if your system has sufficient CPU and memory resources. You may need to allocate more resources to the Thanos components to facilitate the compaction process. Consider scaling up your infrastructure if necessary.
For more detailed information on Thanos and its components, refer to the official Thanos documentation. If you need guidance on configuring Thanos, the Getting Started Guide is a great place to start.
By following these steps, you should be able to resolve the compaction planning issue and ensure smooth operation of your Thanos setup.
(Perfect for DevOps & SREs)
(Perfect for DevOps & SREs)
