pan3793 opened a new pull request, #51130:
URL: https://github.com/apache/spark/pull/51130
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### What changes were proposed in this pull request?
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Though directly printing messages to stdout/stderr is discouraged, but as a
framework, Spark does not forbid users from doing that.
This PR adds a ConsoleRedirectPlugin to allow Spark to redirect
stdout/stderr to the logging system (Log4J2 via Slf4J API).
### Why are the changes needed?
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This is especially useful for integrating with external logging services,
for example, use Kafka Log4J appender to send logs to Kafka, then drain to
ElasticSearch.
### Does this PR introduce _any_ user-facing change?
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Yes, new feature.
### How was this patch tested?
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I don't write UT as it will affect JVM, I will test it manually.
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No.
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