[jira] [Created] (MAPREDUCE-4090) Branch 1 pipes doesn't work on MR2 clusters

["Ahmed Radwan (Created) (JIRA)" <ji...@apache.org>]

Branch 1 pipes doesn't work on MR2 clusters
-------------------------------------------

                 Key: MAPREDUCE-4090
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4090
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: mrv2
            Reporter: Ahmed Radwan


If I compile pipes examples on branch 1: 

{code}
ant -Dcompile.c++=yes examples
{code}

And then try to run it on an MR2 cluster, the pipes job hangs forever at map 0% reduce 0%, I can see in the maps stderr:

{code}
Hadoop Pipes Exception: Illegal text protocol command 
{code}

The issue here is that if users have older pipes job, they won't be able to run it on MR2 (without recompilation). Is this expected or there is something to be fixed so jobs can be used interchangeably? Or should we document it as an incompatibility?

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