martinzink commented on a change in pull request #1181:
URL: https://github.com/apache/nifi-minifi-cpp/pull/1181#discussion_r719129867
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File path: libminifi/src/core/ProcessSession.cpp
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@@ -269,14 +269,15 @@ void ProcessSession::append(const
std::shared_ptr<core::FlowFile> &flow, OutputS
}
// Call the callback to write the content
- size_t oldPos = stream->size();
+ size_t flow_file_size = flow->getSize();
+ size_t stream_size_before_callback = stream->size();
// this prevents an issue if we write, above, with zero length.
- if (oldPos > 0)
- stream->seek(oldPos + 1);
+ if (stream_size_before_callback > 0)
+ stream->seek(stream_size_before_callback + 1);
if (callback->process(stream) < 0) {
throw Exception(FILE_OPERATION_EXCEPTION, "Failed to process flowfile
content");
}
- flow->setSize(stream->size());
+ flow->setSize(flow_file_size - stream_size_before_callback +
stream->size());
Review comment:
The problem was that ContentSession::write with WriteMode::APPEND can
give back a new stream which it will merge with the original stream later.
However the flowfile size is only changed here.
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