Percona XtraDB Cluster 5.6.19-25.6¶
Percona is glad to announce the release of Percona XtraDB Cluster 5.6 on July 21st 2014. Binaries are available from downloads area or from our software repositories.
Based on Percona Server 5.6.19-67.0 including all the bug fixes in it, Galera Replicator 3.6 and on Codership wsrep API 25.6 is now the current General Availability release. All of Percona‘s software is open-source and free, all the details of the release can be found in the 5.6.19-25.6 milestone at Launchpad.
New Features¶
During joiner joining the group, state message exchange provides us with
gcache seqno limits
. That info is now used to choose a donor through IST first, if not possible, only then SST is attempted.wsrep_sst_donor
is also honored here. This is also segment aware. (#1252461)Asynchronous replication slave thread is stopped when the node tries to apply next replication event while the node is in non-primary state. But it would then remain stopped after node successfully re-joined the cluster. A new variable
wsrep_restart_slave
has been implemented, which controls if MySQL slave should be restarted automatically when the node joins back to the cluster. (#1288479)Handling install message and install state message processing has been improved to make group forming more stable in case many nodes are joining the cluster. (#14)
Percona XtraDB Cluster now supports storing the Primary Component state to disk by setting the
pc.recovery
variable totrue
. The Primary Component can then recover automatically when all nodes that were part of the last saved state reestablish communications with each other. This feature can be used for automatic recovery from full cluster crashes, such as in the case of a data center power outage and graceful full cluster restarts without the need for explicitly bootstrapping a new Primary Component. (#10)New
wsrep_evs_repl_latency
status variable has been implemented which provides the group communication replication latency information. (#15)Node consistency issues with foreign keys have been fixed. This fix introduces two new variables:
wsrep_slave_FK_checks
andwsrep_slave_UK_checks
. These variables are set toTRUE
andFALSE
respectively by default. They control whether Foreign Key and Unique Key checking is done for applier threads. (#1260713).
Bugs fixed¶
Fixed the race condition in Foreign Key processing that could cause assertion. Bug fixed #1342959.
The restart sequence in
scripts/mysql.server
would fail to capture and return if the start call failed to start the server, so a restart could occur that failed upon start-up, and the script would still return0
as if it worked without any issues. Bug fixed #1339894.Updating a unique key value could cause server hang if slave node has enabled parallel slaves. Bug fixed #1280896.
Percona XtraDB Cluster has implemented threadpool scheduling fixes. Bug fixed #1333348.
garbd
was returning incorrect return code, ie. whengarbd
was already started, return code was0
. Bug fixed #1308103.
wsrep_sst_rsync
would silently fail on joiner whenrsync
server port was already taken. Bug fixed #1099783.Example
wsrep_notify
script failed on node shutdown. Bug fixed #1132955.When
gmcast.listen_addr
was configured to a certain address, local connection point for outgoing connections was not bound to listen address. This would happen if OS has multiple interfaces with IP addresses in the same subnet, it may happen that OS would pick wrong IP for local connection point and other nodes would see connections originating from IP address which was not listened to. Bug fixed #1240964.Issue with re-setting galera provider (in
wsrep_provider_options
) has been fixed. Bug fixed #1260283.Variable
wsrep_provider_options
couldn’t be set in runtime if no provider was loaded. Bug fixed #1260290.Percona XtraDB Cluster couldn’t be built with Bison 3.0. Bug fixed #1262439.
mysqld
wasn’t handling exceeding max writeset size wsrep error correctly. Bug fixed #1270920.When
FLUSH TABLES WITH READ LOCK
was used on a node withwsrep_causal_reads
set to1
while there was aDML
on other nodes then, subsequent SELECTs/SHOW STATUS didn’t hang earlier providing non-causal output, that has been fixed here. Bug fixed #1271177.Lowest group communication layer (evs) would fail to handle the situation properly when big number of nodes would suddenly start to see each other. Bugs fixed #1271918 and #1249805.
Percona XtraDB Cluster server package no longer conflicts with
mysql-libs
package from CentOS repository. Bug fixed #1278516.The mysql-debug
UNIV_DEBUG
binary was missing from RPM/DEB server packages. Bug fixed #1290087.XtraBackup SST would fail if progress option was used with large number of files. Bug fixed #1294431.
When Query Cache was used and a node would go into non-PRIM state, queries which returned results earlier (and cached into query cache) would still return results whereas newer queries (or the ones not cached) would return
unknown command
. Bug fixed #1296403.Brute Force abort did not work with INSERTs to table with single unique key. Bug fixed #1299116.
InnoDB buffer pool dump and load was not working as expected due to
wsrep_recover
overwriting the buffer pool dump file. Bug fixed #1305955.Close referenced table opened in the same function when foreign constraints were checked, otherwise it could lead to server stall when running
DROP TABLE
. Bug fixed #1309241.Compiling on FreeBSD 10.0 with
CLANG
would result in fatal error. Bug fixed #1309507.Truncating the sorted version of multi-byte character conversion could lead to wsrep certification failures. Bug fixed #1314854.
Cluster node acting as async slave would stop with the wrong position after hitting
max_write_set_size
. Bug fixed #1309669.Fixed the events replication inconsistencies. Bug fixed #1312618.
wsrep_slave_threads
was counted towardsmax_connections
which could causeERROR 1040 (HY000): Too many connections
error. Bug fixed #1315588.Leaving node was not set nonoperational if processed leave message originated from different view than the current one which could cause other nodes to crash. Bug fixed #1323412 (#41).
garb
couldn’t be started withinit
script on RHEL 6.5. Bug fixed #1323652.SST would fail when binlogs were in dedicated directory that’s located inside
datadir
. This bug was a regression introduced by bug fix for #1273368. Bug fixed #1326012.GTID of TOI operations is now also synced to InnoDB tablespace in order to get consistent backups. Bug fixed #1329055.
mysql-debug
is now distributed with binarytar.gz
along with RPM and DEB packages. Bug fixed #1332073.Startup failure with
Undetected state gap
has been fixed. Bug fixed #1334606.Galera3 is now installed in
/usr/lib/galera3/libgalera_smm.so
with a compatibility symlink to/usr/lib/libgalera_smm.so
. Bug fixed #1279328.Galera could not be compiled on PowerPC. Bug fixed #59.
Cluster could stall if leaving node failed to acknowledge all messages it had received due to exception and remaining nodes failed to reach consensus because of that. Bug fixed #37.
When two node instances were set up on the same server with the two different IPs, they couldn’t not work well because they were use wrong IP addresses. Bug fixed #31.
Automated donor selection with segments gave inconsistent results. Bug fixed #29.
Other bug fixes: #1297822, #1269811, #1262887, #1244835, #1338995, #11, #40, #38, #33, and #24.
Help us improve quality by reporting any bugs you encounter using our bug tracking system. As always, thanks for your continued support of Percona!
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