Merge MySQL 5.7.14

Registered by Laurynas Biveinis on 2016-05-30

https://github.com/percona/percona-server/pull/798

Merge MySQL 5.7.14

Review/revert our fix for "pfs_instr-oom" unit test crash as Oracle claims to fix this in 5.7.14
(Bug#23186653 "PERFORMANCE SCHEMA UNIT TESTS PFS_INSTR-OOM & PFS_INSTR_CLASS FAIL REGULARLY").

Make sure changes from Bug#23236404 / Bug #81298 "QUERY REWRITE PLUGIN SUFFERS SCALABILITY ISSUES" are also reflected in the thread pool implementation.

Blueprint information

Status:
Complete
Approver:
Laurynas Biveinis
Priority:
Essential
Drafter:
Laurynas Biveinis
Direction:
Approved
Assignee:
Yura Sorokin
Definition:
Approved
Series goal:
Accepted for 5.7
Implementation:
Implemented
Milestone target:
milestone icon 5.7.14-7
Started by
Yura Sorokin on 2016-08-08
Completed by
Yura Sorokin on 2016-08-09

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