Ok thank you, now I solved it!
The problem was in the env.readFile(myInputFormat, path)
now that path is actually a list of paths what should I pass it?
I solved in this way
env.readFile(new myDelimitedInputFormat(parser)(paths), paths.head)
where that paths.head gives to the read file a url that is just a “placeholder”
and seems to be never used, and the custom input format takes care of creating
the split out of the list of dir
I tried and it works
is it correct way to do that? :)
fyi the create input split is implemented in this way
override def createInputSplits(minNumSplits : Int) = {
files.flatMap((f) => {
super.setFilePath(f)
super.createInputSplits(minNumSplits)
}).toArray
}
where paths is a parameter of the input format constructor (as much as the
custom parser as shown above)
do you think it is useful if a open a stack overflow post of it (maybe with the
custom parser too)?
cheers
michele
Il giorno 14/lug/2015, alle ore 18:50, Stephan Ewen
<[email protected]<mailto:[email protected]>> ha scritto:
For the approach that I outlined, you need to subclass of the file input format.
In that subclass, you store the list of URIs (in a new variable), and override
the "createInputSplits()" method.
Stephan
On Tue, Jul 14, 2015 at 6:42 PM, Michele Bertoni
<[email protected]<mailto:[email protected]>> wrote:
Hi Stephan, I started working on this today, but I am having a problem
Can you be a little more detailed in the procedure?
actually I don’t understand how to give to the input format the list of URI
since it will try putting it in a Path variable
createinputsplit does not receive the path but takes a path from that variable
Thanks,
Michele
Il giorno 26/giu/2015, alle ore 12:28, Michele Bertoni
<[email protected]<mailto:[email protected]>> ha
scritto:
Right!
later I will do the question and quoting your answer with the solution :)
Il giorno 26/giu/2015, alle ore 12:27, Stephan Ewen
<[email protected]<mailto:[email protected]>> ha scritto:
Seems like a good idea to collect these questions.
Stackoverflow is also a good place for "useful tricks"...
On Fri, Jun 26, 2015 at 12:25 PM, Michele Bertoni
<[email protected]<mailto:[email protected]>> wrote:
Got it!
i will try thanks! :)
What about writing a section of it in the programming guide?
I found a couple of topic about the readers in the mailing list, it seems it
may be helpful
Il giorno 26/giu/2015, alle ore 12:21, Stephan Ewen
<[email protected]<mailto:[email protected]>> ha scritto:
Sure, just override the "createInputSplits()" method. Call for each of your
file paths "super.createInputSplits()" and then combine the results into one
array that you return.
That should do it...
On Fri, Jun 26, 2015 at 12:19 PM, Michele Bertoni
<[email protected]<mailto:[email protected]>> wrote:
Hi Stephan, thanks for answering,
right now I am using an extension of the DelimitedInputFormat, is there a way
to merge it with the option 2?
Il giorno 26/giu/2015, alle ore 12:17, Stephan Ewen
<[email protected]<mailto:[email protected]>> ha scritto:
There are two ways you can realize that:
1) Create multiple sources and union them. This is easy, but probably a bit
less efficient.
2) Override the FileInputFormat's createInputSplits method to take a union of
the paths to create a list of all files and fils splits that will be read.
Stephan
On Fri, Jun 26, 2015 at 12:12 PM, Michele Bertoni
<[email protected]<mailto:[email protected]>> wrote:
Hi everybody,
is there a way to specify a list of URI (“hdfs://file1”,”hdfs://file2”,…) and
open them as different files?
I know i may open the entire directory, but i want to be able to select a
subset of files in the directory
thanks
