[WEBSITE]: Querying Parquet with Millisecond Latency #280
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alamb
commented
Nov 30, 2022
| To give a sense of what is possible, the following picture shows a timeline of fetching the footer metadata from remote files, using that metadata to determine what DataPages to read, and then fetching data and decoding simultaneously. This process often must be done for more than one file at a time in order to match network latency, bandwidth and available CPU. | ||
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Note to myself that I hope to clean up this diagram
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Per the mailing list discussion https://lists.apache.org/thread/l377q5f20kyltb37m345p287kpo22qb6 I plan to publish this later today or tomorrow |
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Closes apache/datafusion#3464
This series explains various aspects of parquet decoding and filter pushdown, as implemented in arrow-rs and DataFusion, though it is much more general than that
NOTE
This was published initially on the InfluxData blog first for various reasons. https://www.influxdata.com/blog/querying-parquet-millisecond-latency/
See discussion on mailing list about posting on arrow blog as well https://lists.apache.org/thread/l377q5f20kyltb37m345p287kpo22qb6