* open a SequenceFile.Reader on the sequence file
* in a loop, call next(key,val) on the reader to read the next key/val
pair in the file (see:
http://hadoop.apache.org/common/docs/current/api/org/apache/hadoop/io/SequenceFile.Reader.html#next(org.apache.hadoop.io.Writable,%20org.apache.hadoop.io.Writable)
)
* write code to format the key & val into whatever appropriate format
you want, and write them to the console
* when next(key,val) returns false, exit the loop
HTH,
DR
On 09/07/2011 06:10 PM, ilyal levin wrote:
Can you be more specific on how to perform this. In general is there a way
to convert the binary files i have to text files?
On Tue, Sep 6, 2011 at 11:26 PM, David Rosenstrauch<dar...@darose.net>wrote:
On 09/06/2011 01:57 AM, Niels Basjes wrote:
Hi,
In the past i've had the same situation where I needed the data for
debugging. Back then I chose to create a second job with simply
SequenceFileInputFormat, IdentityMapper, IdentityReducer and finally
TextOutputFormat.
In my situation that worked great for my purpose.
I did similar at my last job, but rather than writing a 2nd map/reduce job
for this, we just wrote a simple command line app that used the Hadoop Java
API to dump the contents of the binary file as text (JSON) to the console.
HTH,
DR
