Today, etcdctl endpoint health only performs a quorum GET. If server is corrupted or exceeded quota (which put the server into read only mode), this command incorrectly returns healthy.

SQL supports hidden columns: columns that are only included in a projection if explicitly requested. An example of this is the rowid column that is created on tables without explicitly primary keys.

Currently, there is no way to get a hidden column on a user-defined table: it's only possible if you manually set the hidden boolean in the table descriptor, by editing the CockroachDB source code

Now insert and query share the resource ( Max Process Count control) 。 When the query with high TPS，the insert will get error (“error: too many process”). I think separator the resource for Insert and Query will makes sense. Ensure enough resource for insert。It looks like Use Yarn， Insert and Query use the different resource quota。
Or the simple way , Can we set Ratio for Insert and

The old restore supports adding prefix and suffix to the backup data. This allows us to restore a key space (say [a, b)) to a new key space (say [awesome_a, awesome_b).

This feature is useful in:

• Performance testing: We do not want to throw away existing loaded data in the cluster because loading a huge DB takes time;
• Cross-verification: Users may want to verify the restored data in the

Hello Philip!
I think there is an issue with this part of the code of rqlite (store/store.go).

func (s *Store) Database(leader bool) ([]byte, error) {
	if leader && s.raft.State() != raft.Leader {
		return nil, ErrNotLeader
	}
	// Ensure only one snapshot can take place at once, and block all queries.
	s.mu.Lock()
	defer s.mu.Unlock()

	f, err := ioutil.TempFile("", "rqlilte-snap-

The current message ("There is no data to display") is misleading. At the minimum, this message should be changed to something like "Fetching the data, please wait". Ideally the implementation should be changed to improving the data load behavior.

Currently we don't have any mechanism to limit the maximum number of clients that could be handled simultaneously.

This feature should be designed properly. Here is some clue: https://redis.io/topics/clients#maximum-number-of-clients

Currently, it's ignored silently. We need to consider some RDBMS doesn't support setting a column comment in CREATE TABLE (e.g. PostgreSQL).

https://github.com/prestosql/presto/blob/22717c61419c851b1c3814b60a3453b22d4a45ef/presto-base-jdbc/src/main/java/io/prestosql/plugin/jdbc/BaseJdbcClient.java#L477

https://github.com/prestosql/presto/blob/22717c61419c851b1c3814b60a3453b22d4a45ef/presto-b

Now that we support more than 1 data type, we should include the values data type in cache nodes. This give us a way of easily identifying what type of data a key points to e.g. string, queue (and more types in the future)

Currently a cache node object consists of a Key, a Value and a TTL. We should also add a field specifying the type of the Value