jerrypeng opened a new pull request, #55620:
URL: https://github.com/apache/spark/pull/55620
Introduces a new Java package org.apache.spark.network.shuffle.streaming in
the network-common module with the complete binary wire protocol for streaming
shuffle:
- StreamingShuffleMessageType: enum of 4 message IDs (DATA, CREDIT_CONTROL,
TERMINATION_CONTROL, TERMINATION_ACK)
- StreamingShuffleMessage: abstract sealed base class; encodes a common
12-byte header (message-type int + sequence-number long); dispatches decode()
to concrete subclasses
- DataMessage: carries serialized records from writer to reader; header
includes shuffleWriterId, shuffleReaderId, dataSize, and CRC32C checksum
- CreditControlMessage: flow-control signal from reader to writer; also
serves as the initial handshake on connection establishment
- TerminationControlMessage: end-of-stream from writer to reader
- TerminationAckMessage: end-of-stream acknowledgment from reader to writer,
echoing the last sequence number seen
- ShuffleChecksum: stateful CRC32C helper supporting both heap and direct
ByteBuf inputs
All classes are pure Java and depend only on Netty (already present in
network-common) and the JDK's java.util.zip.CRC32C (Java 9+).
Adds the STREAMING_SHUFFLE_UNEXPECTED_MESSAGE_TYPE error condition, which
StreamingShuffleMessage.decode() throws if the wire's message-type ordinal does
not map to a known StreamingShuffleMessageType.
Unit tests cover encode/decode round-trips for all message types,
determinism of the checksum, heap/direct buffer equivalence, and the
unknown-type error path.
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