Jaar : Hadoop streaming is een krachtig nut dat wordt geleverd met Hadoop distribution.The basisconcept van Hadoop kader is te splitsen van de baan,verwerken in parallel en wordt dan lid van het terug naar het einde result.So zijn er twee belangrijke componenten betrokken bij dit kader krijgen.
een) Kaart toepassing
b) Verminder toepassing
De Hadoop streaming hulpprogramma kunt u Kaart schrijven / Verkleinen toepassingen in elke taal die in staat is te werken met STDIN en STDOUT.
I read your introduction article about hadoop streaming. I found it really helpful. But I have more questions about how to use it.
One main question I want to ask is if my perl script needs more than one argument, how can I pass them to the command line?
For example, I used the following command, where I used multiple inputs to handle multiple arguments. But in fact, the data input is just the first one. All others are just some resources the perl script needs to read in to help process the first data input.
hadoop jar /usr/lib/hadoop-mapreduce/hadoop-streaming.jar -D mapred.reduce.tasks=0 -D mapred.map.tasks.speculative.execution=false -D mapred.task.timeout=12000000 -input nlp_research/edt_nlp_data/3000001.txt -input shift.txt -input lists -input dict -input nlp_research/deid-1.1/deid.config -inputformat org.apache.hadoop.mapred.lib.NLineInputFormat -output perl_output -mapper deid_mapper.pl -file deid_mapper.pl
If you can give me some guidance, that would be great!