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[Merge] lp:~percona-dev/percona-xtradb/pagehash-latchable into lp:~percona-dev/percona-xtradb/extensions-1.0

 

Yasufumi Kinoshita has proposed merging lp:~percona-dev/percona-xtradb/pagehash-latchable into lp:~percona-dev/percona-xtradb/extensions-1.0.

Requested reviews:
    Percona developers (percona-dev)

The new parameter innodb_rwlock_for_page_hash is added.
(default: 0)

If set 1 or true at startup, rw_lock is used for page_hash instead of mutex.
It will help bug 319487

* in addition: stability of compress table is also improved a little.
-- 
https://code.launchpad.net/~percona-dev/percona-xtradb/pagehash-latchable/+merge/3035
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