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# ==== Purpose ==== # # This test will make many transactions to be grouped when binary logged # and will assert that they used the lock_sidno less times than the amount # of transactions * 2. # # Previous to BUG#24398760 fix, every transaction being committed would # take the lock_sidno twice inside ordered_commit function: # a) At the flush stage, to be assigned with a new GTID and take the ownership # of the GTID; # b) At the commit stage, to release the ownership of the GTID and to add the # gtid to the GTID_EXECUTED set. # # So, a group committing 10 transactions would take the sidno_lock 20 times. # # According to the bug report, having about 300 threads committing small # transactions would lead to groups of up to 90 transactions on high performance # environments. This would mean that the system would have about 180 threads # trying to lock the sidno_lock (90 at the flush stage, 90 at the commit stage). # # Even knowing that the threads would acquire the lock one by one at each stage, # this might generate unnecessary overhead when the system is loaded. # # As the bug fix makes a group of transactions to acquire the sidno_lock only # once at the flush stage and only once at the commit stage, this test case will # create a group of 10 transactions to commit and will observe the performance # schema data about the sidno_lock, asserting that the amount of "hits" on # COUNT_STAR is 2: # - 1 for the whole group on FLUSH stage; # - 1 for the whole group on COMMIT stage. # # ==== Related Bugs and Worklogs ==== # # BUG#24398760 GTIDS REDUCE PERFORMANCE ON WORKLOADS WITH MANY SMALL # TRANSACTIONS # # This test case is binary log format agnostic --source include/have_binlog_format_mixed.inc --source include/have_binlog_order_commits.test --source include/have_perfschema.inc --source include/have_debug_sync.inc --source include/have_gtid.inc # The amount of transactions that will be part of the commit group --let $group_size= 10 --let $rpl_extra_connections_per_server= $group_size --source include/master-slave.inc --let $sync_point_timeout= 100 CREATE TABLE t1 (a INT); # Cleanup performance schema table about locks TRUNCATE performance_schema.events_waits_summary_by_instance; # Execute the transactions up to the FLUSH stage --let $i= 1 while ($i <= $group_size) { --let $statement_connection= server_1_$i --let $sync_point= bgc_after_enrolling_for_flush_stage --let $statement= INSERT INTO t1 VALUES ($i) --let $auxiliary_connection= master --source include/execute_to_sync_point.inc --inc $i } # Let the transactions to execute from the FLUSH stage --let $skip_reap= 1 --let $i= 1 while ($i <= $group_size) { --let $statement_connection= server_1_$i --let $sync_point= bgc_after_enrolling_for_flush_stage --let $statement= INSERT INTO t1 VALUES ($i) --let $auxiliary_connection= master --source include/execute_from_sync_point.inc --inc $i } # Reap all the transactions --let $i= 1 while ($i <= $group_size) { --let $rpl_connection_name= server_1_$i --source include/rpl_connection.inc --reap --inc $i } # There will be one "hit" per transaction on FLUSH stage --let $sidno_lock_count_star= 1 # There will be one "hit" per commit group on COMMIT stage --inc $sidno_lock_count_star --let $assert_text= The group commit should acquire sidno_lock for $sidno_lock_count_star times --let $assert_cond= [ SELECT COUNT_STAR = $sidno_lock_count_star FROM performance_schema.events_waits_summary_by_instance WHERE EVENT_NAME = "wait/synch/mutex/sql/Gtid_state" AND COUNT_STAR > 0 ] --let $extra_debug_info= Current COUNT_STAR for wait/synch/mutex/sql/Gtid_state --let $extra_debug_eval= COUNT_STAR FROM performance_schema.events_waits_summary_by_instance WHERE EVENT_NAME = "wait/synch/mutex/sql/Gtid_state" AND COUNT_STAR > 0 --source include/assert.inc # Cleanup DROP TABLE t1; --source include/rpl_end.inc