Github user Leemoonsoo commented on the issue:
https://github.com/apache/zeppelin/pull/1322
Instead of `USE_SSH_IMPERSONATION`, how about let user customize
impersonation method?
For example,
```
ZEPPELIN_INTERPRETER_IMPERSONATION_CMD="su - ${ZEPPELIN_USER_NAME}"
```
by default. but user can override this env variable, like
```
ZEPPELIN_INTERPRETER_IMPERSONATION_CMD="ssh -p12345
${ZEPPELIN_USER_NAME}@localhost"
```
It gives more flexibility i think. (e.g. give additional options like -p.
use different command to impersonate)
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