Thanks guys. So does this recursive tag work for newAPIHadoopFile?
On Tuesday, March 3, 2015 3:55 PM, Ted Yu <[email protected]> wrote:
Thanks for the confirmation, Stephen.
On Tue, Mar 3, 2015 at 3:53 PM, Stephen Boesch <[email protected]> wrote:
Thanks, I was looking at an old version of FileInputFormat..
BEFORE setting the recursive config
(mapreduce.input.fileinputformat.input.dir.recursive)scala>
sc.textFile("dev/*").count java.io.IOException: Not a file:
file:/shared/sparkup/dev/audit-release/blank_maven_build
The default is null/not set which is evaluated as "false":
scala>
sc.hadoopConfiguration.get("mapreduce.input.fileinputformat.input.dir.recursive")
res1: String = null
AFTER:
Now set the value :
sc.hadoopConfiguration.set("mapreduce.input.fileinputformat.input.dir.recursive","true")
scala>
sc.hadoopConfiguration.get("mapreduce.input.fileinputformat.input.dir.recursive")res4:
String = true
scala>sc.textFile("dev/*").count
..res5: Long = 3481
So it works.
2015-03-03 15:26 GMT-08:00 Ted Yu <[email protected]>:
Looking at FileInputFormat#listStatus(): // Whether we need to recursive
look into the directory structure boolean recursive =
job.getBoolean(INPUT_DIR_RECURSIVE, false);where: public static final String
INPUT_DIR_RECURSIVE =
"mapreduce.input.fileinputformat.input.dir.recursive";FYI
On Tue, Mar 3, 2015 at 3:14 PM, Stephen Boesch <[email protected]> wrote:
The sc.textFile() invokes the Hadoop FileInputFormat via the (subclass)
TextInputFormat. Inside the logic does exist to do the recursive directory
reading - i.e. first detecting if an entry were a directory and if so then
descending:
for (FileStatus globStat: matches) {218 if (globStat.isDir())
{219 for(FileStatus stat: fs.listStatus(globStat.getPath(),220
inputFilter)) {221 result.add(stat);222 }
223 } else {224 result.add(globStat);225 }226
}
However when invoking sc.textFile there are errors on directory entries: "not a
file". This behavior is confusing - given the proper support appears to be in
place for handling directories.
2015-03-03 15:04 GMT-08:00 Sean Owen <[email protected]>:
This API reads a directory of files, not one file. A "file" here
really means a directory full of part-* files. You do not need to read
those separately.
Any syntax that works with Hadoop's FileInputFormat should work. I
thought you could specify a comma-separated list of paths? maybe I am
imagining that.
On Tue, Mar 3, 2015 at 10:57 PM, S. Zhou <[email protected]> wrote:
> Thanks Ted. Actually a follow up question. I need to read multiple HDFS
> files into RDD. What I am doing now is: for each file I read them into a
> RDD. Then later on I union all these RDDs into one RDD. I am not sure if it
> is the best way to do it.
>
> Thanks
> Senqiang
>
>
> On Tuesday, March 3, 2015 2:40 PM, Ted Yu <[email protected]> wrote:
>
>
> Looking at scaladoc:
>
> /** Get an RDD for a Hadoop file with an arbitrary new API InputFormat. */
> def newAPIHadoopFile[K, V, F <: NewInputFormat[K, V]]
>
> Your conclusion is confirmed.
>
> On Tue, Mar 3, 2015 at 1:59 PM, S. Zhou <[email protected]> wrote:
>
> I did some experiments and it seems not. But I like to get confirmation (or
> perhaps I missed something). If it does support, could u let me know how to
> specify multiple folders? Thanks.
>
> Senqiang
>
>
>
>
>
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
