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aba68c8f83
" The second patch in this series is a mechanical conversion of reader_concurrency_semaphore to flat_mutation_reader_v2, and caller updates. The first patch is needed to pass the test suite, since without it a real reader version conversion would happen on every entry to and exit from reader_concurrency_semaphore, which is stressful (for example: mutation_reader_test.test_multishard_streaming_reader reaches 8191 conversions for a couple of readers, which somehow causes it to catch SIGSEGV in diverse and seemingly-random places). Note that in a real workload it is unreasonable to expect readers being parked in a reader_concurrency_semaphore to be pristine, so short-circuiting their version conversions will be impossible and this workaround will not really help. " * tag 'rcs-v2-v4' of https://github.com/cmm/scylla: reader_concurrency_semaphore: convert to flat_mutation_reader_v2 short-circuit flat mutation reader upgrades and downgrades