During their work on the apache/iceberg repository, D Pratap enhanced observability in the Parquet reader by implementing logging for corrupted filenames encountered during decoding errors. They introduced a dedicated logger and updated the Java-based FileIterator.next() method to catch ParquetDecodingException, enabling the system to log the specific file responsible for the error. This data engineering effort improved error handling and logging, allowing teams to trace faulty data sources more efficiently and accelerate root-cause analysis for data quality issues. The change was non-intrusive, preserving existing data processing behavior while providing valuable instrumentation for large-scale data governance and debugging.