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| author | Sachin Setiya <sachinsetia1001@gmail.com> | 2016-12-14 17:14:42 +0530 |
|---|---|---|
| committer | Sachin Setiya <sachinsetia1001@gmail.com> | 2016-12-14 17:14:42 +0530 |
| commit | 5ddd8149e44122feb0989b9944113d2b92d6f84a (patch) | |
| tree | baa490d8ee88ad74f5b9be88c445b6fd228eef60 /sql/wsrep_mysqld.cc | |
| parent | 95422c445db7db60fca688711d98955e59e009e2 (diff) | |
| download | mariadb-git-5ddd8149e44122feb0989b9944113d2b92d6f84a.tar.gz | |
MDEV-11479 Improved wsrep_dirty_reads
Tasks:-
Changes in wsrep_dirty_reads variable
1.) Global + Session scope (Current: session-only)
2.) Can be set using command line.
3.) Allow all commands that do not change data (besides SELECT)
4.) Allow prepared Statements that do not change data
5.) Works with wsrep_sync_wait enabled
Diffstat (limited to 'sql/wsrep_mysqld.cc')
| -rw-r--r-- | sql/wsrep_mysqld.cc | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/sql/wsrep_mysqld.cc b/sql/wsrep_mysqld.cc index 48114fcba34..21c7e94096d 100644 --- a/sql/wsrep_mysqld.cc +++ b/sql/wsrep_mysqld.cc @@ -65,6 +65,8 @@ my_bool wsrep_restart_slave_activated = 0; // node has dropped, and slave // restart will be needed my_bool wsrep_slave_UK_checks = 0; // slave thread does UK checks my_bool wsrep_slave_FK_checks = 0; // slave thread does FK checks +// Allow reads even if the node is not in the primary component. +bool wsrep_dirty_reads = false; /* Set during the creation of first wsrep applier and rollback threads. @@ -894,6 +896,8 @@ bool wsrep_must_sync_wait (THD* thd, uint mask) { return (thd->variables.wsrep_sync_wait & mask) && thd->variables.wsrep_on && + !(thd->variables.wsrep_dirty_reads && + !is_update_query(thd->lex->sql_command)) && !thd->in_active_multi_stmt_transaction() && thd->wsrep_conflict_state != REPLAYING && thd->wsrep_sync_wait_gtid.seqno == WSREP_SEQNO_UNDEFINED; |