Big Data tenth lesson - to solve a given problem, and output problems of MR running locally log4j

A reference blog

1,      https://blog.csdn.net/panguoyuan/article/details/38727273          a given problem

2,      https://blog.csdn.net/qq_31975963/article/details/83898920        log4j output problem

Second, the problems encountered (1)

When the code is running large data Lesson found again reported the following exception (write blog before swear when I run no abnormal ..........)

Exception in thread "main" java.io.IOException: Cannot initialize Cluster. Please check your configuration for mapreduce.framework.name and the correspond server addresses.

 Then find online blog, blog found a reference 1, to solve this problem. Later, he joined with the content in my pom.xml file

        <dependency>
            <groupId>org.apache.hadoop</groupId>
            <artifactId>hadoop-mapreduce-client-common</artifactId>
            <version>2.6.0-cdh5.14.2</version>
        </dependency>        

Then the problem is solved, then the result of the normal output, but does not seem to have found the console log contents output. . . . .

Third, the problems (2) encountered

No console log output. . . . (It is there ,,,, ago I swear)

The Internet to find a solution reference blog 2, to solve this problem

Create a file log4j.properties in the resources directory, add about content

# Set root logger level to DEBUG and its only appender to A1.
log4j.rootLogger=INFO, A1

# A1 is set to be a ConsoleAppender.
log4j.appender.A1=org.apache.log4j.ConsoleAppender

# A1 uses PatternLayout.
log4j.appender.A1.layout=org.apache.log4j.PatternLayout
log4j.appender.A1.layout.ConversionPattern=%-4r [%t] %-5p %c %x - %m%n

Then there is the log run output