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Percona XtraDB Cluster 5.7.19-29.22

Percona is glad to announce the release of Percona XtraDB Cluster 5.7.19-29.22 on September 22, 2017. Binaries are available from the downloads section or from our software repositories.

Percona XtraDB Cluster 5.7.19-29.22 is now the current release, based on the following:

All Percona software is open-source and free.

Upgrade Instructions

After you upgrade each node to Percona XtraDB Cluster 5.7.19-29.22, run the following command on one of the nodes:

$ mysql -uroot -p < /usr/share/mysql/pxc_cluster_view.sql

Then restart all nodes, one at a time:

$ sudo service mysql restart

New Features

  • Introduced the pxc_cluster_view table to get a unified view of the cluster. This table is exposed through the performance schema.
mysql> select * from pxc_cluster_view;
-----------------------------------------------------------------------------
HOST_NAME  UUID                                  STATUS  LOCAL_INDEX  SEGMENT
-----------------------------------------------------------------------------
n1         b25bfd59-93ad-11e7-99c7-7b26c63037a2  DONOR   0            0
n2         be7eae92-93ad-11e7-88d8-92f8234d6ce2  JOINER  1            0
-----------------------------------------------------------------------------
2 rows in set (0.01 sec)

  • PXC-803: Added support for new features in Percona XtraBackup 2.4.7:

    • wsrep_debug enables debug logging

    • encrypt_threads specifies the number of threads that XtraBackup should use for encrypting data (when encrypt=1). This value is passed using the --encrypt-threads option in XtraBackup.

    • backup_threads specifies the number of threads that XtraBackup should use to create backups. See the --parallel option in XtraBackup.

Improvements

  • PXC-835: Limited wsrep_node_name to 64 bytes.

  • PXC-846: Improved logging to report reason of IST failure.

  • PXC-851: Added version compatibility check during SST with XtraBackup:

    • If donor is 5.6 and joiner is 5.7: A warning is printed to perform mysql_upgrade.

    • If donor is 5.7 and joiner is 5.6: An error is printed and SST is rejected.

Fixed Bugs

  • PXC-825: Fixed script for SST with XtraBackup (wsrep_sst_xtrabackup-v2) to include the --defaults-group-suffix when logging to syslog. For more information, see #1559498.

  • PXC-826: Fixed multi-source replication to PXC node slave. For more information, see #1676464.

  • PXC-827: Fixed handling of different binlog names between donor and joiner nodes when GTID is enabled. For more information, see #1690398.

  • PXC-830: Rejected the RESET MASTER operation when wsrep provider is enabled and gtid_mode is set to ON. For more information, see #1249284.

  • PXC-833: Fixed connection failure handling during SST by making the donor retry connection to joiner every second for a maximum of 30 retries. For more information, see #1696273.

  • PXC-839: Fixed GTID inconsistency when setting gtid_next.

  • PXC-840: Fixed typo in alias for systemd configuration.

  • PXC-841: Added check to avoid replication of DDL if sql_log_bin is disabled. For more information, see #1706820.

  • PXC-842: Fixed deadlocks during Load Data Infile (LDI) with log-bin disabled by ensuring that a new transaction (of 10 000 rows) starts only after the previous one is committed by both wsrep and InnoDB. For more information, see #1706514.

  • PXC-843: Fixed situation where the joiner hangs after SST has failed by dropping all transactions in the receive queue. For more information, see #1707633.

  • PXC-853: Fixed cluster recovery by enabling wsrep_ready whenever nodes become PRIMARY.

  • PXC-862: Fixed script for SST with XtraBackup (wsrep_sst_xtrabackup-v2) to use the ssl-dhparams value from the configuration file.

!!! note

  As part of fix for [PXC-827](https://jira.percona.com/browse/PXC-827),
  version communication was added to the SST protocol.
  As a result, newer version of PXC (as of 5.7.19 and later)
  cannot act as donor when joining an older version PXC node (prior to 5.7.19).
  It will work fine vice versa:
  old node can act as donor when joining nodes with new version.