Github user asuhan commented on a diff in the pull request:
    --- Diff: lib/cpp/src/thrift/transport/TBufferTransports.cpp ---
    @@ -361,9 +361,13 @@ void TMemoryBuffer::ensureCanWrite(uint32_t len) {
       // Grow the buffer as necessary.
    -  uint32_t new_size = bufferSize_;
    +  uint64_t new_size = bufferSize_;
       while (len > avail) {
         new_size = new_size > 0 ? new_size * 2 : 1;
    +    if (new_size > std::numeric_limits<uint32_t>::max()) {
    --- End diff --
    Basically, if we only go through powers of 2 when resizing (which looks to 
be the case), the buffer can only grow to 2GB since the maximum value of 
`uint32_t` is one short of 4GB.  

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