Github user witgo commented on a diff in the pull request:
https://github.com/apache/spark/pull/325#discussion_r11471966
--- Diff: core/src/main/scala/org/apache/spark/Logging.scala ---
@@ -135,4 +136,6 @@ trait Logging {
private object Logging {
@volatile private var initialized = false
val initLock = new Object()
+ SLF4JBridgeHandler.removeHandlersForRootLogger()
--- End diff --
RootLogger default is contains Java.Util.Logging.ConsoleHandler
`SLF4JBridgeHandler.removeHandlersForRootLogger()` is used to remove it
`cat jre/lib/logging.properties` =>
handlers= java.util.logging.ConsoleHandler
.level= INFO
java.util.logging.FileHandler.pattern = %h/java%u.log
java.util.logging.FileHandler.limit = 50000
java.util.logging.FileHandler.count = 1
java.util.logging.FileHandler.formatter = java.util.logging.XMLFormatter
java.util.logging.ConsoleHandler.level = INFO
java.util.logging.ConsoleHandler.formatter =
java.util.logging.SimpleFormatter
com.xyz.foo.level = SEVERE
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