A data engineer is troubleshooting a Structured Streaming pipeline that uses Auto Loader. The pipeline ran successfully for several months but suddenly fails to start with an `IllegalStateException: Detected a data loss` error. What is the most likely cause and resolution?

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B. The checkpoint location was deleted or corrupted; delete the checkpoint and restart the stream from scratch or restore the checkpoint from backup. Databricks Structured Streaming documentation states that the checkpoint location persists the stream''s progress metadata, including which files and offsets have been processed. If the checkpoint is deleted or corrupted, Spark can no longer reconcile the stream state with the source, which results in an `IllegalStateException` indicating a data loss condition. The correct resolution is to restore the checkpoint from backup, or if that is not possible, delete the checkpoint and restart the stream, accepting that some records may need to be reprocessed. The other options do not cause this specific error.

A data engineer is troubleshooting a Structured Streaming pipeline that uses Auto Loader. The pipeline ran successfully for several months but suddenly fails to start with an `IllegalStateException: Detected a data loss` error. What is the most likely cause and resolution?

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A data engineer is troubleshooting a Structured Streaming pipeline that uses Auto Loader. The pipeline ran successfully for several months but suddenly fails to start with an IllegalStateException: Detected a data loss error. What is the most likely cause and resolution?

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Discussion

A data engineer is troubleshooting a Structured Streaming pipeline that uses Auto Loader. The pipeline ran successfully for several months but suddenly fails to start with an `IllegalStateException: Detected a data loss` error. What is the most likely cause and resolution?