Thursday, December 17, 2015

Few useful Hadoop 2.6.2 commands

Below are few useful Hadoop (2.6.2) commands:

hadoop namenode -format

#will list processes running in hadoop

hdfs dfs -mkdir /user

hdfs dfs -mkdir /user/hduser

hdfs dfs -mkdir /user/hduser/wordcount

hdfs dfs -mkdir /user/hduser/wordcount/input

cd /usr/local/hadoop/temp_hduser

#copy file from local to hdfs
hdfs dfs -put input1.txt /user/hduser/wordcount/input/file0
hdfs dfs -put input1.txt /user/hduser/wordcount/input/file1

#For removing dirs if you have
hdfs  dfs -rmr /user/hduser/wordcount/output

#Run your jar will read everything from the input dir, below will not work if Yarn is not started :)
hadoop jar chainingmapper.jar  /user/hduser/wordcount/input /user/hduser/wordcount/output

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