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RE: custom FileInputFormat class - Hadoop - [mail # user]
...Hi John,      You can extend  FileInputFormat(or implement InputFormat) and then you need to implement below methods.  1. InputSplit[] getSplits(JobConf job, int num...
   Author: Devaraj k, 2012-05-17, 10:32
RE: what's wrong? i have set JAVA_HOME, but the error tells i haven't set it:( - Hadoop - [mail # general]
...Hi Smith,  How did you set the $JAVA_HOME?  Can you set JAVA_HOME permanently in /etc/profile and try running again?   Thanks Devaraj  ___________________________________...
   Author: Devaraj k, 2012-05-17, 10:12
RE: job Killing itself upon some condition - Hadoop - [mail # user]
...Hi Tousif,       You can kill the Running Job using the killJob() client API.   If you want to kill the job itself, you can get the job id using task attempt id from map(...
   Author: Devaraj k, 2012-05-10, 10:55
RE: Error related Hadoop - Hadoop - [mail # dev]
...This can be due to any of these reasons,  1. No DataNode instances being up and running.  2. The DataNode instances cannot talk to the server, through networking or Hadoop configur...
   Author: Devaraj k, 2012-04-26, 10:20
RE: Passing a value from main() to map() - Hadoop - [mail # user]
...Hi Wang Ruijun,      You can do this way,  1. Set the value in Job configuration with some property name before submitting the job. 2. Get the value in map() function usi...
   Author: Devaraj k, 2012-04-26, 09:58
RE: understanding hadoop job submission - Hadoop - [mail # user]
...You can submit the job using any one of the below ways,  1. If you submit the job using JobClient, you need to create JobConf and submit the job using JobClient.runJob(JobConf conf) API...
   Author: Devaraj k, 2012-04-25, 10:25
RE: hadoop streaming and a directory containing large number of .tgz files - Hadoop - [mail # user]
...Hi Sunil,      Please check HarFileSystem (Hadoop Archive Filesystem), it will be useful to solve your problem.  Thanks Devaraj ________________________________________ F...
   Author: Devaraj k, 2012-04-24, 17:37
RE: Determine the key of Map function - Hadoop - [mail # user]
...Hi Lac,   As per my understanding based on your problem description, you need to the below things.  1. Mapper : Write a mapper which emits records from input files and convert intt...
   Author: Devaraj k, 2012-04-24, 05:21
RE: Reduce side join - Hadoop default - error in combiner - Hadoop - [mail # dev]
...Hi Lopez,     You need to have default constructor for TaggedWritable because while deserializing it creates instance using default constructor and calls the readFields() on it. &n...
   Author: Devaraj k, 2012-04-18, 03:32
RE: Mapping is not happening. - Hadoop - [mail # user]
...Hi Sujit,      Can you check the Job tracker logs for job_201204082039_0002 related info, you can find out what is the status/error.  If you give the job_201204082039_000...
   Author: Devaraj k, 2012-04-10, 06:33
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