Changes in Galera 4.9 (2021-07-26) Codership is pleased to announce the release of Galera Replication library 4.9, implementing wsrep API version 26. The library is available as targeted packages and package repositories for a number of Linux distributions, including Ubuntu, Debian, CentOS, RHEL and SLES. Obtaining packages using a package repository removes the need to download individual files and facilitates the deployment and upgrade of Galera nodes. This and future releases will be available from https://www.galeracluster.com. The latest version of Galera for FreeBSD will be available in the FreeBSD Ports Collection. Notable changes and fixes in Galera since latest release 4.8: - Networking code was fixed to handle address already in use in graceful manner. - Applying of streaming replication write sets was made to respect applying order more reliably. - Too early transaction replay was fixed. - IST failure handling was improved to allow resuming IST after process restart. - A new status variable wsrep_apply_waits was introduced to count the number of times an applier thread had to wait for its turn to apply a write set. - An issue of having incorrect certification results right after SST was fixed. - Occasional excessive GCache CPU consumption during IST was fixed. - GCS flow control now allows write set replication more reliably when the node is in Donor state. - Gcache recovery reliability was improved. - Wsrep provider option socket.ssl_reload is now exposed when SSL is enabled. Build fixes: - CRC32C detection was improved to work correctly with GCC 4.8. - CK_TIMEOUT_MULTIPLER was restored in Debian build scripts to reduce unit test timeouts during builds (codership/galera#558). - Tests which rely on the availability of UDP multicast were disabled by default (codership/galera#595). End of life notices: - Due to little usage pattern we plan to discontinue building Galera 4 packages for SUSE Linux Enterprise Server 15 after this release. The users still running above discontinued platforms are adviced to use the binary tarball package. Known Issues: - In order to install Galera package on CentOS 8 or RHEL 8, MySQL and MariaDB modules need to be disabled first with `dnf -y module disable mysql mariadb`.