New Features
Percona XtraDB Cluster now supports stream compression/decompression with new xtrabackup-sst compressor/decompressor options.
Garbd init script and configuration files have been packaged for CentOS and Debian, in addition, in Debian garbd is packaged separately in percona-xtradb-cluster-garbd-2.x package.
New meta packages are now available in order to make the Percona XtraDB Cluster installation easier.
Debian/Ubuntu debug packages are now available for Galera and garbd.
New SST options have been implemented: inno-backup-opts, inno-apply-opts, inno-move-opts which pass options to backup, apply and move stages of innobackupex.
Initial configurable timeout, of 100 seconds, to receive a first packet via SST has been implemented, so that if donor dies somewhere in between, joiner doesn’t hang. Timeout can be configured with the sst-initial-timeout variable.
The joiner would wait and not fall back to choosing other potential donor nodes (not listed in wsrep_sst_donor) by their state. This happened even when comma was added at the end. This fixes it for that particular case.
Support for Query Cache has been implemented.
Bugs fixed
To avoid disabling Parallel Apply in case of SAVEPOINT or ROLLBACK TO SAVEPOINT the wsrep_cert_deps_distance being 1.0 at all times. Bug fixed #1277703.
First connection would hang after changing the wsrep_cluster_address variable. Bug fixed #1022250.
When gmcast.listen_addr was set manually it did not allow nodes own address in gcomm address list. Bug fixed #1099478.
wsrep_sst_rsync would silently fail on joiner when rsync server port was already taken. Bug fixed #1099783.
Example wsrep_notify script failed on node shutdown. Bug fixed #1132955.
Server would segfault on INSERT DELAYED with wsrep_replicate_myisam set to 1 due to unchecked dereference of NULL pointer. Bug fixed #1165958.
When grastate.dat file was not getting zeroed appropriately it would lead to RBR error during the IST. Bug fixed #1180791.
gcomm exception in PC validate_state_msgs() during cluster partitioning/re-merges” has been fixed. Bug fixed #1182367.
Due to the Provides: line in Percona XtraDB Cluster (which provides Percona-Server-server), the command yum install Percona-Server-server would install Percona XtraDB Cluster instead of the expected Percona Server. Bug fixed #1201499.
Replication of partition tables without binlogging enabled failed, partition truncation didn’t work because of lack of TO isolation there. Bug fixed #1219605.
Exception during group merge after partitioning event has been fixed. Bug fixed #1232747.
Default value for binlog_format is now ROW. This is done so that Percona XtraDB Cluster is not started with wrong defaults leading to non-deterministic outcomes like crash. Bug fixed #1243228.
CREATE TABLE AS SELECT was not replicated, if the select result set was empty. Bug fixed #1246921.
INSERT would return deadlock instead of duplicate key on secondary unique key collision. Bug fixed #1255147.
Joiner node would not initialize storage engines if rsync was used for SST and the first view was non-primary. Bug fixed #1257341.
Table level lock conflict resolving was releasing the wrong lock. Bug fixed #1257678.
Resolved the perl dependencies needed for Percona XtraDB Cluster 5.6. Bug fixed #1258563.
Obsolete dependencies have been removed from Percona XtraDB Cluster. Bug fixed #1259256.
GCache file allocation could fail if file size was a multiple of page size. Bug fixed #1259952.
Percona XtraDB Cluster didn’t validate the parameters of wsrep_provider_options when starting it up. Bug fixed #1260193.
Fixed rsync SST for compatibility with rsync version 3.1.0. Bug fixed #1261673.
During the installation of percona-xtradb-cluster-garbd-3.x package, Debian tries to start it, but as the configuration is not set, it would fail to start and leave the installation in iF state. Bug fixed #1262171.
Runtime checks have been added for dynamic variables which are Galera incompatible. Bug fixed #1262188.
Node would get stuck and required restart if DDL was performed after FLUSH TABLES WITH READ LOCK. Bug fixed #1265656.
xtrabackup-v2 is now used as default SST method in wsrep_sst_method. Bug fixed #1268837.
FLUSH TABLES WITH READ LOCK behavior on the same connection was changed to conform to MySQL behavior. Bug fixed #1269085.
Read-only detection has been added in clustercheck, which can be helpful during major upgrades (this is used by xinetd for HAProxy etc.) Bug fixed #1269469.
Binary log directory is now being cleanup as part of the XtraBackup SST. Bug fixed #1273368.
clustercheck script would mark node as down on Debian based systems if it was run with default values because it was looking for the defaults-extra-file in the wrong directory. Bug fixed #1276076.
Deadlock would happen when NULL unique key was inserted. Workaround has been implemented to support NULL keys, by using the md5 sum of full row as key value. Bug fixed #1276424.
Variables innodb-log-group-home-dir and innodb-data-home-dir are now handled by default (ie., there is no need to set them up in sst_special_dirs). Bug fixed #1276904.
Builds now use system Zlib instead of bundled one. Bug fixed #1277928.
Binlog events were created for the statements for non-InnoDB tables, but they were never cleaned from transaction cache, which could lead to node crash. Bug fixed #1277986.
Galera2 is now installed in /usr/lib/galera2/libgalera_smm.so with a compatibility symlink to /usr/lib/libgalera_smm.so. Bug fixed #1279328.
If transaction size exceeds the wsrep_max_ws_size limit, there will appear a warning message in the error log and replication is skipped. However, the transaction was committed in the master node, and cluster would be in inconsistent state. Bug fixed #1280557.
Updating an unique key value could cause server to hang if slave node has enabled parallel slaves. Bug fixed #1280896.
Fixed incorrect warnings and implemented better handling of repeated usage with same value for wsrep_desync. Bug fixed #1281696.
Using LOAD DATA INFILE in with autocommit set to 0 and wsrep_load_data_splitting set to ON could lead to incomplete loading of records while chunking. Bug fixed #1281810.
Garbd could crash on CentOS if variable gmcast.listen_addr wasn’t set. Bug fixed #1283100.
Node couldn’t be started with wsrep_provider_options option debug set to 1. Bug fixed #1285208.
Boostrapping with pc.bootstrap=1 at runtime in a NON-PRIMARY state would lead to crash. Bug fixed #1286450.
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. Bug fixed #1288479.
New versions of xtrabackup SST scripts were ignoring --socket parameter passed by mysqld. Bug fixed #1289483.
Regression in Galera required explicitly setting socket.ssl to Yes even if you set up variables socket.ssl_key and socket.ssl_cert. Bug fixed #1290006.
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.
Compiling on FreeBSD 10.0 with CLANG would result in fatal error. Bug fixed #1309507.
Use-after-free memory corruption in one_thread_per_connection_end has been fixed. Bug fixed #1310875.
Xtrabackup wouldn’t copy empty test database during the SST. Bug fixed #1231088.
Xtrabackup SST failed when /tmp/test directory existed, fixed by creating unique directories in SST script. Bug fixed #1294760.
Deadlock during server shutdown has been prevented. Bug fixed #1284670.
Race condition during update of wsrep_slave_threads has been avoided. Bug fixed #1290612.
Added new option to the init script to restart a node bootstrapped. Bug fixed #1291024.
Percona XtraDB Cluster server package no longer conflicts with mysql-libs package from CentOS repository. Bug fixed #1278516.
Server abort due to BF-BF lock conflict in lock0lock.c has been fixed. Bug fixed #1264809.
Crash due to segfault in gcache::RingBuffer::get_new_buffer() has been fixed. Bug fixed #1152565.
Applier would fail with lock wait timeout exceeded on rsync SST donor. Bug fixed #1255501.
rsync SST could hang due to missing lsof. Bug fixed #1313293.
Other bugs fixed: #1273101, #1297822, #1289776, #1279844, #1279343, #1278516, #1278417, #1277263, #1276994, #1272961, #1272723, #1269811, #1269351, #1269063, #1262887, #1262716, #1261996, #1261833, #1261138, #1269063, #1256887, #1256769, #1255501, and #1254633.
