[CASSANDRA-13964] Tracing interferes with digest requests when using RandomPartitioner - ASF JIRA

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Details

Type: Bug
Status: Resolved
Priority: Normal
Resolution: Fixed
Fix Version/s: 3.0.16, 3.11.2, 4.0-alpha1, 4.0
Component/s: Legacy/Local Write-Read Paths, Legacy/Observability
Labels:
None

Severity:
Normal
Since Version:

3.0.0

Description

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).