MapReduce used in log analysis
2017-06-08 11:59
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Hadoop
Master/Slave modelHDFS
namenode/datanode
hadoop fs -ls XXX / hls XXX hadoop fs -rmr XXX hadoop fs -cat XXX hadoop fs -get XXX hadoop job -list hadoop job -kill XXX
Map/Reduce
jobtracker/tasktracker
Map => Shullfe => Reduce
Pipe
stdout => stdinless XXX | ./map | ./reduce
Shullfe
copysort
merge
same key in same reduce task
Log Analysis
out of memory???mapred.max.split.size
mapred.reduce.tasks
how to balance time of map and reduce???
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