Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/1547#discussion_r15511267
--- Diff: core/src/main/scala/org/apache/spark/Logging.scala ---
@@ -110,23 +110,26 @@ trait Logging {
}
private def initializeLogging() {
- // If Log4j is being used, but is not initialized, load a default
properties file
- val binder = StaticLoggerBinder.getSingleton
- val usingLog4j =
binder.getLoggerFactoryClassStr.endsWith("Log4jLoggerFactory")
- val log4jInitialized =
LogManager.getRootLogger.getAllAppenders.hasMoreElements
- if (!log4jInitialized && usingLog4j) {
+ // If Log4j 1.2 is being used, but is not initialized, load a default
properties file
+ val binderClass =
StaticLoggerBinder.getSingleton.getLoggerFactoryClassStr
+ // This minimally distinguishes the log4j 1.2 binding, currently
+ // org.slf4j.impl.Log4jLoggerFactory, from the log4j 2.0 binding,
currently
+ // org.apache.logging.slf4j.Log4jLoggerFactory
+ val usingLog4j12 =
+ binderClass.endsWith("Log4jLoggerFactory") &&
binderClass.startsWith("org.slf4j.")
--- End diff --
The check was initially just for `Log4jLoggerFactory`. I suppose that check
would survive package changes in SLF4J. I wanted to minimize the impact, so am
checking for "org.slf4j.*Log4jLoggerFactory" now. I would be completely fine
with a simple string comparison too.
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