Percona XtraDB Cluster moved to 5.6.34-26.19

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Percona XtraDB Cluster moved to
Hrvoje Matijakovic
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1 Kenn Takara, 1 Krunal Bauskar
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6 Fix Released

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The following encryption modes are now deprecated:

The default is encrypt=0 with encryption disabled. The recommended mode now is the new encrypt=4, which uses SSL files generated by MySQL.

For more information, see Encrypting PXC Traffic.
New Features
Added encrypt=4 mode for SST encryption that uses SSL files generated by MySQL. Modes 1, 2, and 3 are now deprecated.
Fixed Bugs
Optimized IST donor selection logic to avoid SST. Child processes are now cleaned-up and node state is resumed if SST fails.
Added init.ok to the list of files that do not get removed during SST.
Fixed error with ASIO library not acknowledging an EPOLLIN event when building Galera.
Fixed stalling of DML workload on slave node caused by FLUSH TABLE executed on master.

For more information, see #1629296.
Fixed super_read_only to not apply to Galera replication applier.

For more information, see #1634295.
Redirected netcat output to stdout to avoid it in the log.

For more information, see #1625968.
Enabled replication of ALTER USER statements.

For more information, see #1376269.
Changed the wsrep_max_ws_rows variable to ignore non-replicated write-sets generated by DML action on temporary tables (explict or implicit).

For more information, see #1638138.
Fixed SST to fail with an error if SSL is not supported by socat, instead of switching to unencrypted mode.
Fixed SST with SSL to auto-generate a 2048-bit dhparams file for versions of socat before 1.7.3. These older versions use 512-bit dhparams file by default that get rejected by newer clients with dh key too small error.
PXC-731: Changed the wsrep_cluster_name variable to read-only, because changing it dynamically leads to high overhead.

For more information, see #1620439.
PXC-732: Improved error message when any of the SSL files required for SST are missing.
PXC-735: Fixed SST to fail with an error when netcat is used (transferfmt set to nc) with SSL encryption (encrypt set to 2, 3 or 4), instead of silently switching to unencrypted mode.
Fixed faulty switch case that caused cluster to stall when the repl.commit_order variable was set to 2 (LOCAL_OOOC mode that should allow out-of-order committing for local transactions).

0 blueprints and 6 bugs targeted

Bug report Importance Assignee Status
1620439 #1620439 Changing dynamically on variable wsrep_cluster_name is not working as expected 5 Low Krunal Bauskar  10 Fix Released
1625968 #1625968 netcat help output in error log when running xtrabackup SST 5 Low Kenn Takara  10 Fix Released
1376269 #1376269 ALTER USER PASSWORD EXPIRE is not replicated 1 Undecided   10 Fix Released
1629296 #1629296 FLUSH TABLE on master can cause pxc-node (acting as slave) to stall DML workload 1 Undecided   10 Fix Released
1634295 #1634295 super_read_only makes node to stop when event is received 1 Undecided   10 Fix Released
1638138 #1638138 Normal select queries with group by generate writesets 1 Undecided   10 Fix Released
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