Myasuka commented on issue #8328: [FLINK-12380] Add thread name in the log4j.properties URL: https://github.com/apache/flink/pull/8328#issuecomment-488324862 @link3280 This PR is inspired by FLINK-12368 when users want to add sub-task index information in the source code. Actually, we could add thread name, which already contains sub-task index information, in the logs to avoid have to change the source code. And `logback` in Flink already configured `thread name` in the pattern (you could refer to the [doc of logginng](https://ci.apache.org/projects/flink/flink-docs-stable/monitoring/logging.html#configuring-logback) to confirm).
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