Github user shivaram commented on the pull request:

    https://github.com/apache/spark/pull/7494#issuecomment-130482232
  
    Yeah I think the right thing to do is to make sure `worker.R` responds with 
UTF-8 strings always. Given the discussion in this thread I think the problem 
is that we use `enc2utf8` in 
https://github.com/apache/spark/blob/738f353988dbf02704bd63f5e35d94402c59ed79/R/pkg/R/serialize.R#L80
 and instead we should use `iconv` there as well


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