我在加载 Spark 框架时遇到了问题，有这种日志。log4j 有问题，我不知道发生了什么。你能给我一些如何解决问题并正确运行的建议吗？
C:\dev\spark-1.6.0-bin-hadoop2.6\bin>spark-shell
log4j:WARN No appenders could be found for logger (org.apache.hadoop.metrics2.li
b.MutableMetricsFactory).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more in
fo.
Using Spark's repl log4j profile: org/apache/spark/log4j-defaults-repl.propertie
s
To adjust logging level use sc.setLogLevel("INFO")
Welcome to
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/___/ .__/\_,_/_/ /_/\_\ version 1.6.0
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Using Scala version 2.10.5 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_73)
Type in expressions to …