gengliangwang commented on code in PR #45729:
URL: https://github.com/apache/spark/pull/45729#discussion_r1540294626
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common/utils/src/main/scala/org/apache/spark/internal/Logging.scala:
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@@ -17,17 +17,39 @@
package org.apache.spark.internal
+import java.util.Locale
+
import scala.jdk.CollectionConverters._
-import org.apache.logging.log4j.{Level, LogManager}
+import org.apache.logging.log4j.{CloseableThreadContext, Level, LogManager}
+import org.apache.logging.log4j.CloseableThreadContext.Instance
import org.apache.logging.log4j.core.{Filter, LifeCycle, LogEvent, Logger =>
Log4jLogger, LoggerContext}
import org.apache.logging.log4j.core.appender.ConsoleAppender
import org.apache.logging.log4j.core.config.DefaultConfiguration
import org.apache.logging.log4j.core.filter.AbstractFilter
import org.slf4j.{Logger, LoggerFactory}
+import org.apache.spark.SparkException
import org.apache.spark.internal.Logging.SparkShellLoggingFilter
-import org.apache.spark.util.SparkClassUtils
+import org.apache.spark.util.{SparkClassUtils, SparkEnvUtils}
+
+// Mapped Diagnostic Context (MDC) that will be used in log messages.
+// The values of the MDC will be inline in the log message, while the
key-value pairs will be
+// part of the ThreadContext.
+case class MDC(key: LogKey.Value, value: String)
Review Comment:
This is a well-known term:
https://logging.apache.org/log4j/1.x/apidocs/org/apache/log4j/MDC.html
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