coder-chenzhi opened a new pull request #551: HADOOP-16162 Remove unused Job 
Summary Appender configurations from log4j.properties
URL: https://github.com/apache/hadoop/pull/551
 
 
   HADOOP-16162 Remove unused Job Summary Appender configurations from 
log4j.properties
   
   The Job Summary Appender (JSA) is introduced in MAPREDUCE-740 to provide the 
summary information of the job's runtime. And this appender is only referenced 
by the logger defined in `org.apache.hadoop.mapred.JobInProgress$JobSummary`. 
However, this class has been removed in MAPREDUCE-4266 together with other M/R1 
files. This appender is no longer used and I guess we can remove it.

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