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MDEV-17262: mysql crashed on galera while node rejoined cluster (#895)

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This patch contains a fix for the MDEV-17262/17243 issues and
new mtr test.

These issues (MDEV-17262/17243) have two reasons:

1) After an intermediate commit, a transaction loses its status
of "transaction that registered in the MySQL for 2pc coordinator"
(in the InnoDB) due to the fact that since version 10.2 the
write_row() function (which located in the ha_innodb.cc) does
not call trx_register_for_2pc(m_prebuilt->trx) during the processing
of split transactions. It is necessary to restore this call inside
the write_row() when an intermediate commit was made (for a split
transaction).

Similarly, we need to set the flag of the started transaction
(m_prebuilt->sql_stat_start) after intermediate commit.

The table->file->extra(HA_EXTRA_FAKE_START_STMT) called from the
wsrep_load_data_split() function (which located in sql_load.cc)
will also do this, but it will be too late. As a result, the call
to the wsrep_append_keys() function from the InnoDB engine may be
lost or function may be called with invalid transaction identifier.

2) If a transaction with the LOAD DATA statement is divided into
logical mini-transactions (of the 10K rows) and binlog is rotated,
then in rare cases due to the wsrep handler re-registration at the
boundary of the split, the last portion of data may be lost. Since
splitting of the LOAD DATA into mini-transactions is technical,
I believe that we should not allow these mini-transactions to fall
into separate binlogs. Therefore, it is necessary to prohibit the
rotation of binlog in the middle of processing LOAD DATA statement.

https://jira.mariadb.org/browse/MDEV-17262 and
https://jira.mariadb.org/browse/MDEV-17243
This commit is contained in:
sysprg
2019-03-18 06:39:51 +01:00
committed by Jan Lindström
parent 5e044f78c0
commit 26432e49d3
13 changed files with 295 additions and 20 deletions
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8
sql/sql_class.h
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@ -4431,6 +4431,14 @@ public:
ulong wsrep_affected_rows;
bool wsrep_replicate_GTID;
bool wsrep_skip_wsrep_GTID;
/* This flag is set when innodb do an intermediate commit to
processing the LOAD DATA INFILE statement by splitting it into 10K
rows chunks. If flag is set, then binlog rotation is not performed
while intermediate transaction try to commit, because in this case
rotation causes unregistration of innodb handler. Later innodb handler
registered again, but replication of last chunk of rows is skipped
by the innodb engine: */
bool wsrep_split_flag;
#endif /* WITH_WSREP */
/* Handling of timeouts for commands */