Created by Sergei Glushchenko on 2013-04-19 and last modified on 2013-04-19
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461. By Sergei Glushchenko on 2013-04-19

Bug 1092593: crash resistant replication doesn't work correctly after
             change master or reset slave
    - further might look rather unstructured; so one might benefit from
      refreshing discussion here https://code.launchpad.net/~laurynas-biveinis/percona-server/bug1012715-5.1/+merge/120042
      before reading this
    - this is how I imagine XA-transactions flow
      * BEGIN do something PREPARE COMMIT BEGIN do something PREPARE COMMIT
      * on each state ROLLBACK can be issued except after
        the COMMIT has been completed successfully and BEGIN is not issued
        (it this case ROLLBACK will just be noop)
      * ROLLBACK should leave us somewhere before the BEGIN
    - when InnoDB performs recovery it takes binlog position
      from the "prepare" point.
    - after this XA transaction can be reverted or committed
    - if XA transaction is reverted then we take binlog position
      from "commit" point which in this case is older than "prepare"
    - if XA transaction is committed then we continue to use "prepare"
      which in this case of same age as "commit" point
    - this however does not work when XA transactions are not in use;
      in this case we never write "prepare" points
    - this might be masked by the fact that we never have real info
      in "prepare" points so it's content is not overwrite MySQL *-info
      files; it is still bad because we don't really have transactional
      writes for binlog position as has been claimed in the documentation
    - solution of this problem looks trivial for me; on commit we should
      overwrite both "prepare" and "commit"; this doesn't make any harm
      as after commit there is no way back to prepare anyway, so XA-case
      continues to work
    - non XA case will look as following
      BEGIN do something COMMIT BEGIN do something COMMIT
      * commit and prepare become the one commit point after which
        there is no way back and it is reflected in our "commit" and
        "prepare" points holding the same binlog position; rollback
        is possible to the previous commit point only

460. By <email address hidden> on 2013-02-28

Merge lp:~percona-core/percona-server/release-5.5.29-30.0

459. By <email address hidden> on 2013-02-27

Merge lp:~akopytov/percona-server/bug1123921

458. By <email address hidden> on 2013-02-27

Merge lp:~akopytov/percona-server/bug1132350

457. By <email address hidden> on 2013-02-27

Merge lp:~akopytov/percona-server/bug1132351

456. By <email address hidden> on 2013-02-27

Empty merge from Percona Server 5.1

455. By <email address hidden> on 2013-02-27

Empty merge from Percona Server 5.1

454. By <email address hidden> on 2013-02-26

Merge lp:~hrvojem/percona-server/rn-5.5.29-30.0-fix

453. By <email address hidden> on 2013-02-26

Merge lp:~akopytov/percona-server/bug1123915

452. By <email address hidden> on 2013-02-26

Merge lp:~akopytov/percona-server/bug1130655

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