Sam Tunnicliffe created CASSANDRA-16721:
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Summary: Repaired data tracking on a read coordinator is
susceptible to races between local and remote requests
Key: CASSANDRA-16721
URL: https://issues.apache.org/jira/browse/CASSANDRA-16721
Project: Cassandra
Issue Type: Bug
Components: Consistency/Coordination
Reporter: Sam Tunnicliffe
Assignee: Sam Tunnicliffe
At read time on a coordinator which is also a replica, the local and remote
reads can race such that the remote responses are received while the local read
is executing. If the remote responses are mismatching, triggering a
{{DigestMismatchException}} and subsequent round of full data reads and read
repair, the local runnable may find the {{isTrackingRepairedStatus}} flag
flipped mid-execution. If this happens after a certain point in execution, it
would mean
that the RepairedDataInfo instance in use is the singleton null object
{{RepairedDataInfo.NULL_REPAIRED_DATA_INFO}}. If this happens, it can lead to
an NPE when calling {{RepairedDataInfo::extend}} when the local results are
iterated.
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