Hi all, I'm writing this email to propose switching back to the previous plain text logs by default, for the following reasons:
- The JSON log is not very human-readable. It's more verbose than plain text, and new lines become `\n`, making query plan tree string and error stacktrace very hard to read. - Structured Logging is not available out of the box. Users must set up a log pipeline to collect the JSON log files on drivers and executors first. Turning it on by default doesn't provide much value. Some examples of the hard-to-read JSON log: [image: image.png] [image: image.png] For the good of Spark engine developers and light Spark users, I think the previous plain text log is a better choice. We can add a doc page to introduce how to use Structured Logging: turn on the config, collect JSON log files, and run queries. Please let me know if you share the same feelings or have different opinions. Thanks, Wenchen
