Writing intermediate key,value pairs to file and read it again
Hello, Can anyone help me in following issue Writing intermediate key,value pairs to file and read it again let us say i have to write each intermediate pair received @reducer to a file and again read that as key value pair again and use it for processing I found IFile.java file which has reader and writer but i am not able understand how to use it for example. I dont understand Counter value as last parameter spilledRecordsCounter Thanks. -- * * * Regards,* * Vikas *
Re: Writing intermediate key,value pairs to file and read it again
writing a map only job will do the trick for you. On Sat, Apr 20, 2013 at 8:43 AM, Vikas Jadhav vikascjadha...@gmail.comwrote: Hello, Can anyone help me in following issue Writing intermediate key,value pairs to file and read it again let us say i have to write each intermediate pair received @reducer to a file and again read that as key value pair again and use it for processing I found IFile.java file which has reader and writer but i am not able understand how to use it for example. I dont understand Counter value as last parameter spilledRecordsCounter Thanks. -- * * * Regards,* * Vikas *
Re: Writing intermediate key,value pairs to file and read it again
How many intermediate keys? If small enough, you can keep them in memory. If large, you can just wait for the job to finish and siphon them into your job as input with the MultipleInputs API. On Apr 20, 2013, at 10:43 AM, Vikas Jadhav vikascjadha...@gmail.com wrote: Hello, Can anyone help me in following issue Writing intermediate key,value pairs to file and read it again let us say i have to write each intermediate pair received @reducer to a file and again read that as key value pair again and use it for processing I found IFile.java file which has reader and writer but i am not able understand how to use it for example. I dont understand Counter value as last parameter spilledRecordsCounter Thanks. -- Regards, Vikas
Re: Writing intermediate key,value pairs to file and read it again
you would look at chain reducer java doc, which meet your requirement. --Send from my Sony mobile. On Apr 20, 2013 11:43 PM, Vikas Jadhav vikascjadha...@gmail.com wrote: Hello, Can anyone help me in following issue Writing intermediate key,value pairs to file and read it again let us say i have to write each intermediate pair received @reducer to a file and again read that as key value pair again and use it for processing I found IFile.java file which has reader and writer but i am not able understand how to use it for example. I dont understand Counter value as last parameter spilledRecordsCounter Thanks. -- * * * Regards,* * Vikas *
