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日志
错误信息，如下：
log4j:WARN No appenders could be found for logger (org.apache.hadoop.metrics2.lib.MutableMetricsFactory).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
解决办法：
在src下创建log4j.properties文件，文件中加入如下配置：
# Configure logging for testing: optionally with log file
log4j.rootLogger=info,appender
log4j.appender.appender=org.apache.log4j.ConsoleAppender
log4j.appender.appender.layout=org.apache.log4j.TTCCLayout
远程调试
Failed to connect to remote VM. Connection refused.
Connection refused: connect
尚未解决
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