Thanks for your advise, File.createTempFile() works great, at least in
pseudo-ditributed mode, hope cluster solution will do the same work. You
saved me hours of trying...
On 04/07/2012 11:29 PM, Harsh J wrote:
MapReduce sets "mapred.child.tmp" for all tasks to be the Task
Attempt's WorkingDir/tmp automatically. This also sets the
-Djava.io.tmpdir prop for each task at JVM boot.
Hence you may use the regular Java API to create a temporary file:
http://docs.oracle.com/javase/6/docs/api/java/io/File.html#createTempFile(java.lang.String,%20java.lang.String)
These files would also be automatically deleted away after the task
attempt is done.
On Sun, Apr 8, 2012 at 2:14 AM, Ondřej Klimpera<klimp...@fit.cvut.cz> wrote:
Hello,
I would like to ask you if it is possible to create and work with a
temporary file while in a map function.
I suppose that map function is running on a single node in Hadoop cluster.
So what is a safe way to create a temporary file and read from it in one
map() run. If it is possible is there a size limit for the file.
The file can not be created before hadoop job is created. I need to create
and process the file inside map().
Thanks for your answer.
Ondrej Klimpera.
