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Percona Server 5.7.20-19 (2018-01-03)

Percona is glad to announce the release of Percona Server 5.7.20-19 on January 3, 2018. Downloads are available here and from the Percona Software Repositories.

This release is based on MySQL 5.7.20 and includes all the bug fixes in it. Percona Server 5.7.20-19 is now the current GA (Generally Available) release in the 5.7 series. All software developed by Percona is open-source and free. Details of this release can be found in the 5.7.20-19 milestone on Launchpad.

New Features

  • Now MyRocks Storage Engine has General Availability status.

  • Binary log encryption has been implemented and can be now switched on using the encrypt_binlog variable.

  • innodb_print_lock_wait_timeout_info variable, introduced in the previous release, but undocumented, allows to log information about all lock wait timeout errors.

Bugs Fixed

  • Intermediary slave with Blackhole storage engine couldn’t record updates from master to its own binary log in case the master has the binlog_rows_query_log_events option enabled. Bug fixed #1722789 (upstream #88057).

  • Help command in the MySQL command line client provided a link to an older version of the Percona Server for MySQL manual. Bug fixed #1708073.

  • A regression in the mysqld_safe script forced it to print an extra error when stopping the MySQL service. Bugs fixed #1738742.

  • Blackhole storage engine was incompatible with a newer length limit of the InnoDB index key prefixes. Bug fixed #1733049 (upstream #53588).

  • Heartbeats received by a slave were reacted with mysql.slave_master_info table sync on each of them even with sync_master_info set to zero, causing a huge increase in write load. Bug fixed #1708033 (upstream #85158).

MyRocks Changes

  • The replication writebatch functionality has been removed from Percona Server for MySQL 5.7 due to the unsafety of the current implementation.

  • The variables rocksdb_block_cachecompressed_hit, rocksdb_block_cachecompressed_miss, and rocksdb_getupdatessince_calls were renamed to rocksdb_block_cache_compressed_hit, rocksdb_block_cache_compressed_miss, and rocksdb_get_updates_since_calls respectively.