org.apache.flink.runtime.io.network.api.writer.RecordWriter
    org.apache.flink.runtime.io.network.api.writer.RecordWriter.OutputFlusher

    org.apache.flink.runtime.io.network.partition.ResultPartition
    org.apache.flink.runtime.io.network.partition.ResultSubpartition
    org.apache.flink.runtime.io.network.api.serialization.RecordSerializer
    org.apache.flink.runtime.io.network.buffer.BufferBuilder
    org.apache.flink.runtime.io.network.buffer.BufferConsumer
    org.apache.flink.runtime.io.network.buffer.BufferPool
    org.apache.flink.runtime.io.network.partition.consumer.InputChannel