Aastat : Hadoop streaming on võimas utiliit, mis pakub Hadoop distribution.The põhikontseptsioon Hadoop raames on jagada töö,töödelda paralleelselt ja siis liituda selle tagasi saada lõpuks result.So on kaks peamist komponenti on seotud käesolevas raamistikus.
a) Kaardirakendus
b) Vähendada taotlus
Hadoop streaming utiliit võimaldab teil kirjutada Kaart / Vähendada rakendusi mis tahes keeles, mis on võimelised töötama koos stdin ja 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!