日志
修改hadoop logs的存储路径以及修改map 、 reduce的任务数
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1. Create a directory to store the logfiles. For example, /root/hadoop_logs .
2. Uncomment the line that includes HADOOP_LOG_DIR in HADOOP_HOME/conf/hadoop-env.sh and point it to the new directory.
3. Add the following lines to the HADOOP_HOME/conf/mapred-site.xml file:
<property>
<name>mapred.tasktracker.map.tasks.maximum</name><value>2 </value></property><property><name>mapred.tasktracker.reduce.tasks.maximum</name><value>2 </value></property>
4. Restart the Hadoop cluster by running the bin/stop-mapred.sh andbin/start-mapred.sh commands from the HADOOP_HOME directory.
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