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  1. Cassandra
  2. CASSANDRA-16721

Repaired data tracking on a read coordinator is susceptible to races between local and remote requests

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      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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            • Assignee:
              maedhroz Caleb Rackliffe
              Reporter:
              samt Sam Tunnicliffe
              Authors:
              Caleb Rackliffe, Sam Tunnicliffe
              Reviewers:
              Alex Petrov, Caleb Rackliffe, Sam Tunnicliffe
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