List:Internals« Previous MessageNext Message »
From:Dmitry Lenev Date:June 19 2012 7:53pm
Subject:Re: purpose of thd_mark_transaction_to_rollback
View as plain text  
Hello Zardosht!

* Zardosht Kasheff <zardosht@stripped> [12/06/19 22:20]:
> Hello all,
> What is the purpose of thd_mark_transaction_to_rollback?

This call allows storage engine to request a transaction/statement
rollback from SQL-layer.

For example, when InnoDB storage engine detects a deadlock it rolls
back the transaction inside storage engine (i.e. itself), but it still
needs to invoke this method so transaction is properly rolled back
in other storage engines (including binary log).

> Under what conditions is a storage engine required to call this function?

See above. I guess it is good idea to call this method when your
storage engine decides to initiate a transaction rollback because
of internal reasons, i.e. in case when such a rollback is not
explicitly initiated from SQL-layer.

Hope this helps!

Dmitry Lenev, Software Developer
Oracle Development SPB/MySQL,

Are you MySQL certified?
purpose of thd_mark_transaction_to_rollbackZardosht Kasheff19 Jun
  • Re: purpose of thd_mark_transaction_to_rollbackDmitry Lenev19 Jun
    • Re: purpose of thd_mark_transaction_to_rollbackZardosht Kasheff20 Jun
      • Re: purpose of thd_mark_transaction_to_rollbackStewart Smith21 Jun
        • Re: purpose of thd_mark_transaction_to_rollbackZardosht Kasheff21 Jun
          • Re: purpose of thd_mark_transaction_to_rollbackStewart Smith22 Jun
      • Re: purpose of thd_mark_transaction_to_rollbackDmitry Lenev21 Jun