# a warning  in percona server 5.6 error log

**URL:** <https://forums.percona.com/t/a-warning-in-percona-server-5-6-error-log/4725>\
**Category:** Other MySQL® Questions\
**Created:** [February 16, 2016, 2:50am UTC](https://forums.percona.com/t/a-warning-in-percona-server-5-6-error-log/4725 "2016-02-16T02:50:02Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![zhangshengdong](https://avatars.discourse-cdn.com/v4/letter/z/c77e96/32.png) [@zhangshengdong](https://forums.percona.com/u/zhangshengdong)\
**Post date:** [February 16, 2016, 2:50am UTC](https://forums.percona.com/t/a-warning-in-percona-server-5-6-error-log/4725/1 "2016-02-16T02:50:02Z")

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according [https://www.percona.com/blog/201](https://www.percona.com/blog/201) … percona-server-5-6/ zhis blog.

I agree wiht contribution.  
but,I set my.cnf file with below parameters to install percona server 5.6:

innodb\_adaptive\_hash\_index\_partitions=65

in error log ,i got some warning information as follows;

----------------------------------warning---------------------------------------------

2016-02-16 16:05:23 0 [Note] /usr/sbin/mysqld (mysqld 5.6.28-76.1-log) starting as process 23043 …  
InnoDB: Warning: innodb\_log\_block\_size has been changed from default value 512. (###EXPERIMENTAL### operation)  
InnoDB: The log block size is set to 4096.

2016-02-16 16:05:24 23043 [Warning] InnoDB: Setting thread 23074 nice to -20 failed, current nice 0, errno 13  
2016-02-16 16:05:24 23043 [Warning] InnoDB: Setting thread 23075 nice to -20 failed, current nice 0, errno 13

* * *

this above phenomenon is normal?