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This is the first I've read of the JSON Lines format. What problem does this solve?

*answered my question shortly after posting by re-reading the blog post: "enables incremental writing and reading of the recording."

So it makes streaming data a lot easier.

JSON lines is fairly common in cases where you don't want to hold the entire file in memory.

The first (and pretty much only time) I've run into this file format is with Apache Spark: https://spark.apache.org/docs/latest/sql-programming-guide.h...