Andrew Whang created CASSANDRA-13632:
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Summary: Digest mismatch if (non-static) column is null
Key: CASSANDRA-13632
URL: https://issues.apache.org/jira/browse/CASSANDRA-13632
Project: Cassandra
Issue Type: Bug
Components: Local Write-Read Paths
Reporter: Andrew Whang
This issue is similar to CASSANDRA-12090. Quorum read queries that include a
column selector (non-wildcard) result in digest mismatch when the column value
is null. It seems the data serialization path checks if rowIterator.isEmpty()
and if so ignores column names (by setting IS_EMPTY flag). However, the digest
serialization path does not perform this check and includes column names. The
digest comparison results in a mismatch. The mismatch does not end up issuing a
read repair mutation since the underlying data is the same.
Our use case involves frequent deletion of partition columns, so the mismatch
on the read path ends up doubling our p99 read latency. We discovered this
issue while testing a 2.2.5 to 3.0.13 upgrade.
As with CASSANDRA-12090, fixing the digest seems sensible.
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