What is the default compression codec used by Parquet? If you store data in Parquet, is it encrypted by default? What compression technique does it use by default?
💡 Model Answer
Parquet’s default compression codec is Snappy, chosen for its balance between speed and compression ratio. Parquet files are not encrypted by default; they are stored as plain files on the underlying storage (e.g., HDFS, S3). If encryption is required, you can enable it at the file or column level using tools like AWS S3 Server‑Side Encryption (SSE‑S3, SSE‑KMS) or Hadoop’s Transparent Data Encryption. The compression is applied per column chunk, so each column can be compressed independently, which helps with column‑arithmetic and reduces I/O.
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