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d66b07823b
All partitions will have a corresponding mutation object in the buffer. These objects have non-negligible sizes, yet the consumer did not bump the _buffer_size when a new partition was consumer. This resulted in empty partitions not moving the _buffer_size at all, and thus they could accumulate without bounds in the buffer, never triggering a flush just by themselves. We have recently seen this causing OOM. This patch fixes that by bumping the _buffer_size with the size of the freshly created mutation object.