hunyadi-dev commented on a change in pull request #979:
URL: https://github.com/apache/nifi-minifi-cpp/pull/979#discussion_r584704996



##########
File path: extensions/aws/s3/S3WrapperBase.cpp
##########
@@ -144,7 +144,7 @@ bool S3WrapperBase::deleteObject(const std::string& bucket, 
const std::string& o
 int64_t S3WrapperBase::writeFetchedBody(Aws::IOStream& source, const int64_t 
data_size, const std::shared_ptr<io::BaseStream>& output) {
   static const uint64_t BUFFER_SIZE = 4096;
   std::vector<uint8_t> buffer;
-  buffer.reserve(BUFFER_SIZE);
+  buffer.resize(BUFFER_SIZE);

Review comment:
       Both the static bufffer size and the preallocation adds performance 
overhead. Suggestion:
   ```c++
   std::vector<unsigned char> buffer(4096);
   ```




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