# Percona Server

**URL:** <https://forums.percona.com/t/percona-server/1944>\
**Category:** Other MySQL® Questions\
**Created:** [December 6, 2012, 10:24pm UTC](https://forums.percona.com/t/percona-server/1944 "2012-12-06T22:24:27Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![khannvin](https://avatars.discourse-cdn.com/v4/letter/k/8e7dd6/32.png) [@khannvin](https://forums.percona.com/u/khannvin)\
**Post date:** [December 6, 2012, 10:24pm UTC](https://forums.percona.com/t/percona-server/1944/1 "2012-12-06T22:24:27Z")

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Hi, I am running Server version: 5.5.22-55-log Percona Server (GPL), Release rel25.2, Revision 237

I am getting below errors from “SHOW ENGINE INNODB STATUS”:

OS WAIT ARRAY INFO: reservation count 248796, signal count 10462982  
–Thread 1218939200 has waited at btr0sea.c line 1508 for 0.0000 seconds the semaphore:  
S-lock on RW-latch at 0x29ea4b18 ‘btr\_search\_latch\_part[i]’  
number of readers 0, waiters flag 0, lock\_word: 100000  
Last time read locked in file btr0sea.c line 918  
Last time write locked in file /home/jenkins/workspace/percona-server-5.5-rpms/label\_exp/ce ntos5-64/target/BUILD/Percona-Server-5.5.22-rel25.2/Percona- Server-5.5.22-rel25.2/storage/innobase/btr/btr0sea.c line 669

INNODB STATUS file attached.

Looking forward for your suggestion.

Thanks!

Vineet

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**Author:** ![khannvin](https://avatars.discourse-cdn.com/v4/letter/k/8e7dd6/32.png) [@khannvin](https://forums.percona.com/u/khannvin)\
**Post date:** [December 10, 2012, 3:19am UTC](https://forums.percona.com/t/percona-server/1944/2 "2012-12-10T03:19:38Z")

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Anyone can update on that its a Application issue or bug of Percona Server.

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**Author:** ![niljoshi](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/niljoshi/32/16889_2.png) [@niljoshi](https://forums.percona.com/u/niljoshi)\
**Post date:** [December 11, 2012, 2:05am UTC](https://forums.percona.com/t/percona-server/1944/3 "2012-12-11T02:05:58Z")

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Hi,

Are you using adaptive hash partitions? If yes then it might be this problem [URL][https://bugs.launchpad.net/percona-server/+bug/791030[/URL]](https://bugs.launchpad.net/percona-server/+bug/791030%5B/URL%5D) . If you are not using partitions then might be you have too much concurrency and should try to limit it to 8 with innodb\_thread\_concurrency. Can you provide the details of my.cnf? output of “show global variables” and “show global status” would be helpful too.