[GitHub] NicoK commented on issue #6417: [FLINK-9913][runtime] Improve output serialization only once in RecordWriter

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NicoK commented on issue #6417: [FLINK-9913][runtime] Improve output serialization only once in RecordWriter
URL: https://github.com/apache/flink/pull/6417#issuecomment-416236083
 
 
   I don't quite get the argument with the `pruneBuffer()` call having this much overhead...at least for small records since its implementation only prunes if the buffer is larger than 5MiB:
   ```
   	public void pruneBuffer() {
   		if (this.buffer.length > PRUNE_BUFFER_THRESHOLD) {
   ...
   ```

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