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From "Andrew Whang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-13632) Digest mismatch if (non-static) column is null
Date Thu, 22 Jun 2017 23:48:00 GMT
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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