Vincent Rischmann created CASSANDRA-19861:
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Summary: Incomplete specification of CRC computation in protocol
v5 framing
Key: CASSANDRA-19861
URL: https://issues.apache.org/jira/browse/CASSANDRA-19861
Project: Cassandra
Issue Type: Improvement
Components: Documentation
Reporter: Vincent Rischmann
I've been working on a Cassandra client as a side project. While implementing
protocol v5 framing I've encountered an issue regarding how to compute the
CRC32 of the frame payload and I believe the specification is incomplete.
[The
specification|https://github.com/apache/cassandra/blob/trunk/doc/native_protocol_v5.spec#L97-L175]
says "CRC32 of payload" or "Payload CRC32" but looking at the source code of
Cassandra the CRC32 is seeded with some magic bytes first, see
https://github.com/apache/cassandra/blob/trunk/src/java/org/apache/cassandra/net/Crc.java#L38-L54
This isn't documented anywhere in the specification as far as I can tell, but
it seems to me it should be.
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