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@renecannao renecannao released this 11 May 14:50
v2.4.0
6fc9c45

v2.4.0 Release notes

Release date: 2022-05-11

This is a major release for ProxySQL 2.x series containing several important features, fixes and enhancements.

Compared to ProxySQL 2.3.2 , ProxySQL 2.4.0 introduces the following changes:

New features and enhancements

Major

  • Session variable 'transaction_isolation' now doesn't disable multiplexing #3664 .

  • OpenSSL updated from version 1.1.1j to v3.0.2 #3844 #3675 .

  • Introduced new variable mysql-unshun_algorithm . It controls if the automatic unshunning of a host is performed just on the hostgroup where traffic is sent, or on all hostgroups where the host exists #3649 .

  • Added support for command COM_RESET_CONNECTION for frontend connections #3645 .

  • Improved startup time when MySQL worker threads are listening to multiple sockets #3700 .

  • Added pidfile to be configurable through config file #3707 .

  • The implementation of the parsing of queries and the query digests was extensively improved: #3680

    • Multiple fixes for query digests parsing for more homogeneous digest generation.
    • Added new configuration variable mysql-query_digests_groups_grouping_limit allowing to grouping over digests grouped by mysql-query_digests_grouping_limit , for example for INSERT statements that inserts multiple rows.
    • Added new configuration variable mysql-query_digests_keep_comment: when enabled, comments of the kind /* */ are not stripped from the query digest.

  • Several improvements on how session variables are parsed and processed, including an improved handling of SQL_LOG_BIN and tracking of the following variables: #3702 and #3754

    • aurora_read_replica_read_committed
    • group_replication_consistency
    • lc_messages
    • lc_time_names
    • max_execution_time
    • optimizer_prune_level
    • optimizer_search_depth
    • query_cache_type
    • sort_buffer_size
    • timestamp
    • tmp_table_size

  • Multiple ProxySQL Cluster improvements #3305:

    • Each ProxySQL node now must have an UUID, that can be either:
      • configured in the configuration file
      • supplied by command line using option -U (or -uuid), or
      • automatically generated
    • Cluster nodes register themselves when connecting to another Cluster node using their own UUID
    • Because nodes register themselves when connecting to another node, core ProxySQL Cluster nodes are now aware of other client ProxySQL nodes. Such information is accessible via stats_proxysql_servers_clients_status table
    • To avoid race conditions and verify correctness, the checksums of the configuration is checked before and after the synchronization itself

  • Added support for SELECT current_user() and SELECT user() in Admin #3725 .

  • Added Clang build support #3775

  • Added new distros for builds and packages:

  • Removed variables mysql-client_multi_statements and mysql-client_found_rows , as they were already deprecated #3793

  • Added new config variable mysql-auto_increment_delay_multiplex_timeout_ms that allows to specify a timeout, after which mysql-auto_increment_delay_multiplex is invalidated, thus re-enabling multiplexing #3839 .

  • Added regex support for spiffe_id user attribute #3820 .

  • Added tracking of protocol flag NO_BACKSLASH_ESCAPES in case it is changed #3854

  • Added several new prometheus metrics:

    • proxysql_fds_in_use, exposing the number of FD currently in use #3676
    • proxysql_version_info #3782
    • exporting several stats cluster tables #3790 :
      - stats_proxysql_servers_checksums
      - stats_proxysql_servers_clients_status
      - stats_proxysql_servers_metrics

  • Added new variable mysql-monitor_replication_lag_group_by_host . When enabled, MySQL Monitor will perform only 1 replication lag check per server even if present in multiple hostgroups #3867

Minor

  • Improved the processing of tablestats_history.history_mysql_status_variables for better scalability and reduced storage requirement #3674 .
  • Field last_updated from table stats_mysql_client_host_cache is now reported in seconds #3735 .
  • After ProxySQL packages generation copy created ProxySQL binaries sha1 files into 'binaries' directory #3755 .
  • Added new debug_filters table in Debug build. This table can be used to filter specific information from error log when debug_levels is enabled .
  • Added extra logging when no servers are available in a hostgroup #3806 .
  • Version check now limits fetched output to '32' bytes. See commit ccf6d9e .
  • Added stats capabilities for log messages. Relevant for future logging messaging improvement #3824 .
  • Improved error report for RESTAPI scripts #3838 .
  • Various performance improvements

Bug Fixes

Major

  • If fast_forward was enabled for a user and during authentication a large packet was received, the authentication itself could fail #3658
  • Under certain high load conditions multiplexing was incorrectly disabled #3658
  • When mysql-log_mysql_warnings_enabled was enabled, MySQL warnings generated from a query were incorrectly returned as the resultset of the next executed query #3652 .
  • Fixed a stall in MySQL_Thread due to an immediate return of function mysql_real_query_start() #3652 .
  • When mysql-query_digests=false , some USE query could cause proxysql to crash #3657 .
  • When a client issues COM_CHANGE_USER, variable user_attributes was not being preserved #3645 .
  • Fixed crashes due to invalid handling of big packets for Admin #3710 .
  • wsrep_sync_wait was not check on several backend versions, including PXC 8.0 #3727 .
  • Fixed conflict between fast_forward and CLIENT_DEPRECATE_EOF when frontend and backend connections didn't have the same flag #3757.
  • create_new_connection annotation could not work as intended if a connection was retrieved from thread-local connection pool #3757 .
  • When a client issued a COM_CHANGE_USER command, 'Auth Method Switch' during handshake was not being properly handled. This affected libmysqlclient #3504.
  • Fixed several invalid query interceptions for prepared statements , specifically: #3826
    • SELECT CONNECTION_ID()
    • SELECT LAST_INSERT_ID()
    • SELECT @@IDENTIFY
  • Fixed monitoring not working properly for AWS aurora auto-discovered servers #3797 .
  • If many backend connections were used, some idle backend connections were not getting pinged #3836 .
  • Fixed multiple deadlocks regarding ProxySQL Cluster nodes synchronization , and the interaction between ProxySQL Cluster and Admin #3305 and #3848
  • Added proper handling of signal EINTR affecting scripts launched by the RESTAPI #3838 .
  • Fixed several issues reported by CodeQL #3815 .
  • Fixed several invalid memory usage.

Minor

  • Fixed compilation inside rootless containers #3686.
  • Fixed mysql-ssl_p2s_capath typo in 'refresh_variables' #3834.
  • Fixed crashes when 'gtid_executed' reported by proxysql_mysqlbinlog reader is empty #3817 .
  • To track GTID , ProxySQL was incorrectly trying to connect also to server in OFFLINE_HARD status #3817 .
  • Fixed duplicated counting of MySQL errors for client connections #3856 .

SHA256s:

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