Kartashov, Andy 2012-11-08, 21:48
Mohammad Tariq 2012-11-08, 22:27
Jay Vyas 2012-11-08, 22:31
Mohammad Tariq 2012-11-08, 22:33
Marcos Ortiz Valmaseda 2012-11-08, 23:06
-Re: hadoop - running examples
Andy Isaacson 2012-11-08, 23:33
On Thu, Nov 8, 2012 at 1:48 PM, Kartashov, Andy <[EMAIL PROTECTED]> wrote:
> When running examples, you bring them into HDFS. Say, you need to make some correction to a file, you need to make them on local FS and run $hadoop fs -put ... again. You cannot just make changes to files inside HDFS except for "touchz" a file, correct?
If you need to change existing data, you do need to write a new file,
or delete the old file then re-write it. So as far as that goes, yes,
you cannot just make changes.
However, files can be appended to in HDFS, although I am not aware of
a "hdfs dfs -append" command to do append from the commandline. So
it's not quite correct to say that touchz is the only thing to change
an existing file.