cloud-fan commented on a change in pull request #32850:
URL: https://github.com/apache/spark/pull/32850#discussion_r660333239
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File path: core/src/main/resources/error/README.md
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@@ -0,0 +1,79 @@
+# Guidelines
+
+To throw a standardized exception, developers should use an error class and
message parameters
+rather than an arbitrary error message.
+
+## Usage
+
+To throw an exception, do the following.
+
+1. Check if an appropriate error class already exists in `error-class.json`.
Review comment:
I think json file is more general for auditing, doc generation,
internationalization (each error message has translations for different
languages).
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