Hi,
I'm trying to deploy on a flink cluster the jar of my program.
Unfortunately I have a problem when I call on the first node:
I installed Flink on the cluster using the following guide and without
errors:  flink cluster setup guide
<https://ci.apache.org/projects/flink/flink-docs-release-0.8/cluster_setup.html>  
anyway I haven't followed the section about HDFS installation (it is not
fundamental, right?)

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