In the cast of no failures with a single source, single channel and single
sink you will see ordering. However, I believe when there is a failure file
channel will change ordering on rollback.
If strict ordering is required it's advisable to assign sequence numbers
upstream and then re-order the data with either a MR job or Impala query
once they land in MapReduce.
On Wed, Feb 12, 2014 at 12:02 AM, Christopher Shannon <[EMAIL PROTECTED]
Apache MRUnit - Unit testing MapReduce - http://mrunit.apache.org