AHeise commented on a change in pull request #7713: [FLINK-10995][runtime] Copy
intermediate serialization results only once for broadcast mode
URL: https://github.com/apache/flink/pull/7713#discussion_r327059906
##########
File path:
flink-runtime/src/main/java/org/apache/flink/runtime/io/network/api/writer/BroadcastRecordWriter.java
##########
@@ -18,30 +18,163 @@
package org.apache.flink.runtime.io.network.api.writer;
+import org.apache.flink.annotation.VisibleForTesting;
import org.apache.flink.core.io.IOReadableWritable;
+import org.apache.flink.runtime.io.network.buffer.BufferBuilder;
+import org.apache.flink.runtime.io.network.buffer.BufferConsumer;
import java.io.IOException;
+import java.util.Optional;
+
+import static org.apache.flink.util.Preconditions.checkState;
/**
* A special record-oriented runtime result writer only for broadcast mode.
*
- * <p>The BroadcastRecordWriter extends the {@link RecordWriter} and handles
{@link #emit(IOReadableWritable)}
- * operation via {@link #broadcastEmit(IOReadableWritable)} directly in a more
efficient way.
+ * <p>The BroadcastRecordWriter extends the {@link RecordWriter} and maintain
a single {@link BufferBuilder}
+ * for all the channels. Then the serialization results need be copied only
once to this buffer which would be
+ * shared for all the channels in a more efficient way.
*
* @param <T> the type of the record that can be emitted with this record
writer
*/
public class BroadcastRecordWriter<T extends IOReadableWritable> extends
RecordWriter<T> {
+ /** The current buffer builder shared for all the channels. */
+ private Optional<BufferBuilder> bufferBuilder = Optional.empty();
Review comment:
Optional fields are
[discouraged](http://mail-archives.apache.org/mod_mbox/flink-dev/201908.mbox/%3CCAA_61Xo9oif8RjJgvxFNo%2Bua7_DoFksCy_5c_NOnQLWfS4-8qA%40mail.gmail.com%3E).
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