Isaac Reath created CASSANDRA-21216:
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Summary: ClassCastException thrown on read and write paths after
schema modification
Key: CASSANDRA-21216
URL: https://issues.apache.org/jira/browse/CASSANDRA-21216
Project: Apache Cassandra
Issue Type: Bug
Components: Legacy/Local Write-Read Paths
Reporter: Isaac Reath
Attachments: ClassCastException-Read.txt,
ClassCastException-Writes-1.txt
After a schema modification on a cluster serving reads and writes, we have
noticed that it is possible to see ClassCastException being thrown when
comparing clustering keys in a few codepaths (see attached stacktraces).
The table in question is a very wide table, ~4200 columns and it occurred
originally on a cluster with 30 nodes running 4.1.3.
I've been able to reproduce it on a 3 node cluster running 4.1.10 with a single
data center that is doing ~60 req/sec and frequent concurrent schema
modifications. It appears to be a race as it doesn't happen on every schema
change, but will occur at a rate of roughly 1/200 schema changes while the
read/write workload is ongoing.
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