Percona Server 5.7.15-9 发布，MySQL 衍生版

Percona Server 5.7.15-9 发布了，该版本基于 MySQL 5.7.15。

该版本主要是修复bug：

新功能

A new TokuDB tokudb_dir_per_db option was introduced to address two TokuDB shortcomings, the renaming of data files on table/index rename, and the ability to group data files together within a directory that represents a single database. This feature is enabled by default.

Bug 修复

Audit Log Plugin malformed record could be written after audit_log_flush was set to ON in ASYNC andPERFORMANCE modes. Bug fixed #1613650.
Running SELECT DISTINCT x...ORDER BY y LIMIT N,N could lead to a server crash. Bug fixed #1617586.
Workloads with statements that take non-transactional locks (LOCK TABLES, global read lock, and similar) could have caused deadlocks when running under Thread Pool with high priority queue enabled andthread_pool_high_prio_mode set to transactions. Fixed by placing such statements into the high priority queue even with the above thread_pool_high_prio_mode setting. Bugs fixed #1619559 and #1374930.
Fixed memory leaks in Audit Log Plugin. Bug fixed #1620152 (upstream #71759).
Server could crash due to a glibc bug in handling short-lived detached threads. Bug fixed #1621012(upstream #82886).
QUERY_RESPONSE_TIME_READ and QUERY_RESPONSE_TIME_WRITE were returning QUERY_RESPONSE_TIME table data if accessed through a name that is not full uppercase. Bug fixed #1552428.
Cipher ECDHE-RSA-AES128-GCM-SHA256 was listed in the list of supported ciphers but it wasn’t supported. Bug fixed #1622034 (upstream #82935).
Successful recovery of a torn page from the doublewrite buffer was showed as a warning in the error log. Bug fixed #1622985.
LRU manager threads could run too long on a server shutdown, causing a server crash. Bug fixed #1626069.
tokudb_default was not recognized by Percona Server as a valid row format. Bug fixed #1626206.
InnoDB ANALYZE TABLE didn’t remove its table from the background statistics processing queue. Bug fixed#1626441 (upstream #71761).
Upstream merge for #81657 to 5.6 was incorrect. Bug fixed #1626936 (upstream #83124).
Fixed multi-threaded slave thread leaks that happened in case of thread create failure. Bug fixed #1619622(upstream #82980).
Shutdown waiting for a purge to complete was undiagnosed for the first minute. Bug fixed #1616785.