Github user mxm commented on the pull request:
https://github.com/apache/flink/pull/992#issuecomment-130644950
`StringBuilder` is only for single-threaded while `StringBuffer` enables
multi-thread access. If you use `StringBuffer` in a single-threaded scenario it
has worse performance than `StringBuilder`.
Thanks for you changes. In addition to the "infinity" test, can you add a
test that checks for a certain number of retries (e.g. 10)? Also please add a
check for 1 and 0 retries. It's always good to test corner cases :)
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