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From "Sam Tunnicliffe (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-13964) Tracing interferes with digest requests when using RandomPartitioner
Date Wed, 18 Oct 2017 11:24:00 GMT
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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