Github user greghogan commented on the pull request:
https://github.com/apache/flink/pull/1523#issuecomment-175671773
The `pdsh` section on [Environment
Variables](http://linux.die.net/man/1/pdsh) lists two options:
> PDSH_SSH_ARGS
> Override the standard arguments that pdsh passes to the ssh(1) command
("-2 -a -x -l%u %h"). The use of the parameters %u, %h, and %n (as documented
in the rcmd/exec section above) is optional. If these parameters are missing,
pdsh will append them to the ssh commandline because it is assumed they are
mandatory.
> PDSH_SSH_ARGS_APPEND
> Append additional options to the ssh(1) command invoked by pdsh. For
example, PDSH_SSH_ARGS_APPEND="-q" would run ssh in quiet mode, or "-v" would
increase the verbosity of ssh. (Note: these arguments are actually prepended to
the ssh commandline to ensure they appear before any target hostname argument
to ssh.)
By default `pdsh` is enforcing protocol version 2, disabling the
authentication agent, and disabling X11 forwarding. For consistency we can
blank out PDSH_SSH_ARGS and set PDSH_SSH_ARGS_APPEND to FLINK_SSH_OPTS.
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