"found" by the @discordapp troops the hard way: https://status.discordapp.com/incidents/62gt9cgjwdgf
pinging @zorkian who pointed it out to me.

trivial to repro, this is against a 3.3.13 on fedora-31.

$ etcdctl set /baa schnorp
$ etcdctl get /baa
schnorp
$ echo -ne 'PUT /v2/keys/baa HTTP/1.1\r\nHost: boo\r\nContent-Length: 123\r\n\r\n' | nc localhost 2379
HTTP/1.1 200 OK
...
$ et

In #58923, we added the ability to set a column as VISIBLE and NOT VISIBLE.

We now need the ability to have ALTER COLUMN <col> SET [VISIBLE|NOT VISIBLE].

The changes to do this are as follows (you can follow SET DEFAULT as a guideline for what to write)

• Add a type AlterTableSetVisible struct { Visible bool } struct to tree/alter_table.go, similar to AlterTableSetDefault.
• Add th

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 network option setting code uses the default option code, which interprets the bytes passed to the option as a binary encoded 8 byte integer. The only way to set an integer value is to set the environment variable to the 8 byte binary encoding.

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-

Example we could protect pieces like TableInfo::tablet_map_ with GUARDED_BY(lock_) and then annotate the respective read/write accessor methods like TableInfo::AddTablet

cc @mikhpolitov @rahuldesirazu

We should remove Guava as a dependency from the server module.

Most of the functionality we used from Guava are provided by the JDK by now.
The stuff that is missing from the JDK has mostly been added in the utilities we inherited from Elasticsearch, due to their decision to remove Guava completely.
Any functionality that we use which isn't present in the JDK can be co

Tests in https://github.com/trinodb/trino/blob/master/core/trino-parser/src/test/java/io/trino/sql/parser/TestSqlParser.java that currently rely on assertExpression and assertStatement need to be updated to use ParserAssert.

Examples:
https://github.com/trinodb/trino/blob/master/core/trino-parser/src/test/java/io/trino/sql/parser/TestSqlParser.java#L234
https://github.com/trinodb/trino/bl

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

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