Apache Parquet

Apache Parquet is a free and open-source column-oriented data storage format of the Apache Hadoop ecosystem. It is similar to the other columnar-storage file formats available in Hadoop namely RCFile and ORC. It is compatible with most of the data processing frameworks in the Hadoop environment.
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Migrating to Parquet – The Veraset Story

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Introducing InfluxDB IOx, a Federated In-Memory Columnar Store Backed by Object Storage

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