Kristian Nielsen 2f4a0c5be2 Fix accumulation of old rows in mysql.gtid_slave_pos ...

This would happen especially in optimistic parallel replication, where there
is a good chance that a transaction will be rolled back (due to conflicts)
after it has executed record_gtid(). If the transaction did any deletions of
old rows as part of record_gtid(), those deletions will be undone as well.
And the code did not properly ensure that the deletions would be re-tried.

This patch makes record_gtid() remember the list of deletions done as part
of a transaction. Then in rpl_slave_state::update() when the changes have
been committed, we discard the list. However, in case of error and rollback,
in cleanup_context() we will instead put the list back into
rpl_global_gtid_slave_state so that the deletions will be re-tried later.

Probably fixes part of the cause of MDEV-12147 as well.

Signed-off-by: Kristian Nielsen <knielsen@knielsen-hq.org>

2018-10-07 18:59:52 +02:00

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