We use clickhosue version 21.12.2.17 before.It works well

But we found that after upgrade to 22.3.3, the memory of clickhouse used grow up daily .

I don't know if this is a memory overflow

here is the promethues metric 'ClickHouseMetrics_MemoryTracking'  duration last 15days

![image](https://user-images.githubusercontent.com/8294900/163744096-80270f73-becd-47ce-91b7-c6a96f13c1b6.png)

and I restarted cknode1 at 4.14 ,you can see it come down and rising again.

And here is some sql and result I have run for diagnosis。

![image](https://user-images.githubusercontent.com/8294900/163744418-251c86d8-832c-4aff-aa1a-6e565d47d196.png)

![image](https://user-images.githubusercontent.com/8294900/163744455-73813554-784a-4df6-803e-5ef49dbf1776.png)

![image](https://user-images.githubusercontent.com/8294900/163744529-50c4e359-feb7-4499-9449-0efc1c75942f.png)

![image](https://user-images.githubusercontent.com/8294900/163744587-c51e3ba3-6925-4591-b15d-bb0e0262af8c.png)

we use dict and MaterializedView . no living view.

we have tried  'system drop mark cache '  and change 'max_bytes_before_external_group_by' to '6g'.Not work

Is there anyting else  I can do?





CurrentMetrics::Increment metric_increment{CurrentMetrics::Read};
                struct iovec io_vec{ .iov_base = request.buf, .iov_len = request.size };
                res = syscall(
                    SYS_preadv2, fd,
                    &io_vec, 1,
                    
                    static_cast<int64_t>(request.offset), static_cast<int64_t>(request.offset >> 32),
                    
                    RWF_NOWAIT);
            }
            if (!res)
            {
                
                promise.set_value({0, 0});
                watch.stop();
                ProfileEvents::increment(ProfileEvents::ThreadPoolReaderPageCacheHitElapsedMicroseconds, watch.elapsedMicroseconds());
                ProfileEvents::increment(ProfileEvents::DiskReadElapsedMicroseconds, watch.elapsedMicroseconds());
                return future;
            }
            if (-1 == res)
            {
                if (errno == ENOSYS || errno == EOPNOTSUPP)
                {
                    
                    has_pread_nowait_support.store(false, std::memory_order_relaxed);
                    break;
                }
                else if (errno == EAGAIN)
                {