Github user nickwallen commented on the pull request:
https://github.com/apache/incubator-metron/pull/122#issuecomment-220195558
+1 Tested successfully with EC2 deployment.
This same issue has bit us twice now. It was difficult to diagnose this
issue because it only impacted a few users. It seems that OpenSSH imposes a
104 character limit on the length of the path to the domain socket.
The previous configuration embedded things like the username and working
directory in the path of the domain socket. It would fail for people who had
very specific platform differences, like a long username or highly nested path
to Metron, which would then exceed the 104 character limit. I myself was never
able to replicate the problem until now.
This is our second attempt at a fix and I think this is the right approach.
Using `%%C` results in a fixed-length hash. Using `~/.ssh/` also ensures that
the path is also of fixed-length. This removes any variability that might
cause it to exceed 104 characters. [Seems like others agree
too.](https://github.com/ansible/ansible/issues/11536)
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