https://clickhouse-test-reports.s3.yandex.net/18817/9049599e367bcccd809f45af138452f965b3303a/stress_test_(undefined)/test_run.txt.out.log
{
    auto lock = getLock();
    if (shared->mark_cache)
        throw Exception("Mark cache has been already created.", ErrorCodes::LOGICAL_ERROR);
    shared->mark_cache = std::make_shared<MarkCache>(cache_size_in_bytes);
}
MarkCachePtr Context::getMarkCache() const
{
    auto lock = getLock();
    return shared->mark_cache;
}
void Context::dropMarkCache() const
{
    auto lock = getLock();
    if (shared->mark_cache)
        shared->mark_cache->reset();
}
void Context::dropCaches() const
{
    auto lock = getLock();
    if (shared->uncompressed_cache)
        shared->uncompressed_cache->reset();
    if (shared->mark_cache)
        shared->mark_cache->reset();
}
BackgroundSchedulePool & Context::getBufferFlushSchedulePool() const