Sam Tunnicliffe created CASSANDRA-13964:
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Summary: Tracing interferes with digest requests when using
RandomPartitioner
Key: CASSANDRA-13964
URL: https://issues.apache.org/jira/browse/CASSANDRA-13964
Project: Cassandra
Issue Type: Bug
Components: Local Write-Read Paths, Observability
Reporter: Sam Tunnicliffe
Assignee: Sam Tunnicliffe
A {{ThreadLocal<MessageDigest>}} is used to generate the MD5 digest when a
replica serves a read command and the {{isDigestQuery}} flag is set. The same
threadlocal is also used by {{RandomPartitioner}} to decorate partition keys.
So in a cluster with RP, if tracing is enabled the data digest is corrupted by
the partitioner making tokens for the tracing mutations. This causes a digest
mismatch on the coordinator, triggering a full data read on every read where CL
> 1 (or speculative execution/read repair kick in).
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