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Percona 5.6.21 crashing frequently

MySQL-UserMySQL-User EntrantCurrent User Role Beginner
Repeatedly on my slave server, I am getting assertion failures after 7-8 hrs for semaphore wait and has lasted for more than 600 seconds.
General load on server - jobs run on this server creating temporary tables
MySQL Version - 5.6.21-70.1
OS - Linux


  • scott.nemesscott.nemes MySQL Sage Current User Role Patron
    Hi MySQL-user;

    This is a tricky one, as you could be running into legitimate contention issues that are causing this, or it could be a bug. One thing you could try is setting Innodb_adaptive_hash_index=0 to disable the adaptive hash index. This appears to fix similar issues others are having, so it is worth a try.

    If that does not work, post the rest of the monitor output so we can see what InnoDB is up to.

  • MySQL-UserMySQL-User Entrant Current User Role Beginner
    Thanks Scott !!

    I disabled the adaptive hash index for now. After that I have not seen any crashes, which I suppose that activity on database has also gone down (from application side). I will be monitoring the same for few days.

    As you identified that a possible reason could be legitimate contention issues, what would be your suggestion to resolve or lower the degree of contention happening in MySQL.

  • MySQL-UserMySQL-User Entrant Current User Role Beginner
    Will post you entire innodb status observed during a crash.
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