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0ca3250e59
read_buffer_size set on master
BUG#33413 show binlog events fails if binlog has event size of close
to max_allowed_packet
The size of Append_block replication event was determined solely by
read_buffer_size whereas the rest of replication code deals with
max_allowed_packet.
When the former parameter was set to larger than the latter there were
two artifacts: the master could not read events from binlog;
show master events did not show.
Fixed with
- fragmenting the used io-cached buffer into pieces each size of less
than max_allowed_packet (bug#30435)
- incrementing show-binlog-events handling thread's max_allowed_packet
with the max estimated for the replication header size
31 lines
1.4 KiB
Text
31 lines
1.4 KiB
Text
stop slave;
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drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
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reset master;
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reset slave;
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drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
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start slave;
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create table t2 (id int not null primary key auto_increment);
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show variables like 'max_allowed_packet' /* 8K */;
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Variable_name Value
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max_allowed_packet 7168
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show variables like 'read_buffer_size' /* 9K */;
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Variable_name Value
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read_buffer_size 8228
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load data infile '/home/elkin/MySQL/TEAM/FIXES/5.0/bug33435-load_data_read_buffer_size/mysql-test/var/tmp/bug30435_5k.txt' into table t2;
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select count(*) from t2 /* 5 000 */;
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count(*)
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5000
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show binlog events in 'master-bin.000002' from 98;
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Log_name Pos Event_type Server_id End_log_pos Info
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master-bin.000002 98 Query 1 # use `test`; create table t2 (id int not null primary key auto_increment)
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master-bin.000002 221 Begin_load_query 1 # ;file_id=1;block_len=7168
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master-bin.000002 7412 Append_block 1 # ;file_id=1;block_len=7168
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master-bin.000002 14603 Append_block 1 # ;file_id=1;block_len=2048
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master-bin.000002 16674 Append_block 1 # ;file_id=1;block_len=7168
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master-bin.000002 23865 Append_block 1 # ;file_id=1;block_len=341
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master-bin.000002 24229 Execute_load_query 1 # use `test`; load data infile '/home/elkin/MySQL/TEAM/FIXES/5.0/bug33435-load_data_read_buffer_size/mysql-test/var/tmp/bug30435_5k.txt' into table t2 ;file_id=1
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select count(*) from t2 /* 5 000 */;
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count(*)
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5000
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drop table t1, t2;
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end of the tests
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