If you use Percona Server 5.5 and you have configured it to use multiple buffer pool instances than sooner or later youll see the following lines on the servers error log and chances are youll be worried about them: [crayon-54f381dc06a7f792453169/] Worry not as this is mostly harmless. Its becoming a February tradition for me (Fernando) [&]

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http://www.percona.com/blog/2015/02/26/worrying-about-the-innodb-detected-cycle-in-lru-for-buffer-pool-message/