Prometheus is an open-source systems monitoring and alerting toolkit originally built at SoundCloud. It is now a standalone open-source project and maintained independently of any company. Prometheus collects and stores its metrics as time series data, i.e., metrics information is stored with the timestamp at which it was recorded, alongside optional key-value pairs called labels.
When Prometheus encounters TSDB (Time Series Database) corruption, you might observe errors such as 'corruption in the time series database' in the logs, or Prometheus might fail to start altogether. These symptoms are indicative of underlying issues with the database files.
Some common error messages that indicate TSDB corruption include:
unexpected end of JSON inputchecksum mismatchcorruption in segmentTSDB corruption can occur due to several reasons, with the most common being abrupt shutdowns of the Prometheus server or disk issues. These events can lead to incomplete writes or corrupted data blocks, which in turn cause the database to become unreadable or unstable.
Disk issues such as bad sectors or disk failures can also lead to data corruption. It is crucial to ensure that the storage medium used for Prometheus is reliable and monitored for health.
Fixing TSDB corruption involves either repairing the database or restoring it from a backup. Below are the steps you can follow:
prometheus tsdb repair --dir=To prevent future occurrences of TSDB corruption, consider implementing the following measures:
For more detailed information on Prometheus and TSDB management, you can refer to the Prometheus Documentation and the TSDB Storage Documentation.
Let Dr. Droid create custom investigation plans for your infrastructure.
Book Demo
