Hello!
Ubuntu 18.04, MariaDB 10.2.26 binaries support LZ4 and ZSTD (not final in rocksdb)
What do you mean by "not final in RocksDB"?
Is there any way to tell which compression algos are supported by which releases on which distros?
Not at the moment. The page https://mariadb.com/kb/en/innodb-page-compression/#configuring-the-innodb-pa... lists what options in theory are available, but in reality it varies on what was enabled in the build. RocksDB compression in a separate thing, and documented at https://mariadb.com/kb/en/myrocks-and-data-compression/ In Debian.org (and Ubuntu) repositories you can find MariaDB 10.3 which supports both lz4 and zstd both in InnoDB and in RocksDB. We have work in progress to upstream this support to the upstream MariaDB 10.5 so that users would have the option to choose these whenever they want. In fact, there has been a PR (https://github.com/MariaDB/server/pull/1582) pending for some weeks now but there is a shortage of manpower to review and test everything. If your company Stockpulse.de has a support contract with MariaDB.com I recommend you notify your contact person that this feature is important for you. - Otto