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

Please FIY MySQL proxy's implementation on MySQLComStmtExecuteExecutor and MySQLComQueryPacketExecutor

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-

When clicking through on a tablet, in a TS /tablets view, we can look at it's consensus status. In there, we do not display the tablet ID, we just have it in the endpoint, eg: 127.0.0.1:9000/tablet-consensus-status?id=02ea2f428dd44087a62fd0c9d07de97f

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

We deprecated the functions in prestosql/presto#5200, prestosql/presto#5213

Rationale:

There is no way of preventing instanceof VarcharType and we do no try
to discourage that. For consistency of the code base, let's standardize
on (unavoidable) instanceof and depart from using a method to check
that.

Note also we do not h

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